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c0f0a93936
llvm-6502/lib/Target/X86/X86ISelLowering.cpp
Preston Gurd c0f0a93936 For Intel Atom, use ILP scheduling always, instead of ILP for 64 bit 
and Hybrid for 32 bit, since benchmarks show ILP scheduling is better
most of the time.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156028 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-02 22:02:02 +00:00

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//===-- X86ISelLowering.cpp - X86 DAG Lowering Implementation -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that X86 uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "x86-isel"
#include "X86ISelLowering.h"
#include "X86.h"
#include "X86InstrBuilder.h"
#include "X86TargetMachine.h"
#include "X86TargetObjectFile.h"
#include "Utils/X86ShuffleDecode.h"
#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/GlobalAlias.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/LLVMContext.h"
#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/VariadicFunction.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Target/TargetOptions.h"
#include <bitset>
using namespace llvm;
STATISTIC(NumTailCalls, "Number of tail calls");
// Forward declarations.
static SDValue getMOVL(SelectionDAG &DAG, DebugLoc dl, EVT VT, SDValue V1,
SDValue V2);
/// Generate a DAG to grab 128-bits from a vector > 128 bits. This
/// sets things up to match to an AVX VEXTRACTF128 instruction or a
/// simple subregister reference. Idx is an index in the 128 bits we
/// want. It need not be aligned to a 128-bit bounday. That makes
/// lowering EXTRACT_VECTOR_ELT operations easier.
static SDValue Extract128BitVector(SDValue Vec, unsigned IdxVal,
SelectionDAG &DAG, DebugLoc dl) {
EVT VT = Vec.getValueType();
assert(VT.getSizeInBits() == 256 && "Unexpected vector size!");
EVT ElVT = VT.getVectorElementType();
unsigned Factor = VT.getSizeInBits()/128;
EVT ResultVT = EVT::getVectorVT(*DAG.getContext(), ElVT,
VT.getVectorNumElements()/Factor);
// Extract from UNDEF is UNDEF.
if (Vec.getOpcode() == ISD::UNDEF)
return DAG.getUNDEF(ResultVT);
// Extract the relevant 128 bits. Generate an EXTRACT_SUBVECTOR
// we can match to VEXTRACTF128.
unsigned ElemsPerChunk = 128 / ElVT.getSizeInBits();
// This is the index of the first element of the 128-bit chunk
// we want.
unsigned NormalizedIdxVal = (((IdxVal * ElVT.getSizeInBits()) / 128)
* ElemsPerChunk);
SDValue VecIdx = DAG.getConstant(NormalizedIdxVal, MVT::i32);
SDValue Result = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, ResultVT, Vec,
VecIdx);
return Result;
}
/// Generate a DAG to put 128-bits into a vector > 128 bits. This
/// sets things up to match to an AVX VINSERTF128 instruction or a
/// simple superregister reference. Idx is an index in the 128 bits
/// we want. It need not be aligned to a 128-bit bounday. That makes
/// lowering INSERT_VECTOR_ELT operations easier.
static SDValue Insert128BitVector(SDValue Result, SDValue Vec,
unsigned IdxVal, SelectionDAG &DAG,
DebugLoc dl) {
EVT VT = Vec.getValueType();
assert(VT.getSizeInBits() == 128 && "Unexpected vector size!");
EVT ElVT = VT.getVectorElementType();
EVT ResultVT = Result.getValueType();
// Insert the relevant 128 bits.
unsigned ElemsPerChunk = 128/ElVT.getSizeInBits();
// This is the index of the first element of the 128-bit chunk
// we want.
unsigned NormalizedIdxVal = (((IdxVal * ElVT.getSizeInBits())/128)
* ElemsPerChunk);
SDValue VecIdx = DAG.getConstant(NormalizedIdxVal, MVT::i32);
Result = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResultVT, Result, Vec,
VecIdx);
return Result;
}
/// Concat two 128-bit vectors into a 256 bit vector using VINSERTF128
/// instructions. This is used because creating CONCAT_VECTOR nodes of
/// BUILD_VECTORS returns a larger BUILD_VECTOR while we're trying to lower
/// large BUILD_VECTORS.
static SDValue Concat128BitVectors(SDValue V1, SDValue V2, EVT VT,
unsigned NumElems, SelectionDAG &DAG,
DebugLoc dl) {
SDValue V = Insert128BitVector(DAG.getUNDEF(VT), V1, 0, DAG, dl);
return Insert128BitVector(V, V2, NumElems/2, DAG, dl);
}
static TargetLoweringObjectFile *createTLOF(X86TargetMachine &TM) {
const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
bool is64Bit = Subtarget->is64Bit();
if (Subtarget->isTargetEnvMacho()) {
if (is64Bit)
return new X8664_MachoTargetObjectFile();
return new TargetLoweringObjectFileMachO();
}
if (Subtarget->isTargetELF())
return new TargetLoweringObjectFileELF();
if (Subtarget->isTargetCOFF() && !Subtarget->isTargetEnvMacho())
return new TargetLoweringObjectFileCOFF();
llvm_unreachable("unknown subtarget type");
}
X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
: TargetLowering(TM, createTLOF(TM)) {
Subtarget = &TM.getSubtarget<X86Subtarget>();
X86ScalarSSEf64 = Subtarget->hasSSE2();
X86ScalarSSEf32 = Subtarget->hasSSE1();
X86StackPtr = Subtarget->is64Bit() ? X86::RSP : X86::ESP;
RegInfo = TM.getRegisterInfo();
TD = getTargetData();
// Set up the TargetLowering object.
static const MVT IntVTs[] = { MVT::i8, MVT::i16, MVT::i32, MVT::i64 };
// X86 is weird, it always uses i8 for shift amounts and setcc results.
setBooleanContents(ZeroOrOneBooleanContent);
// X86-SSE is even stranger. It uses -1 or 0 for vector masks.
setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
// For 64-bit since we have so many registers use the ILP scheduler, for
// 32-bit code use the register pressure specific scheduling.
// For Atom, always use ILP scheduling.
if (Subtarget->isAtom())
setSchedulingPreference(Sched::ILP);
else if (Subtarget->is64Bit())
setSchedulingPreference(Sched::ILP);
else
setSchedulingPreference(Sched::RegPressure);
setStackPointerRegisterToSaveRestore(X86StackPtr);
if (Subtarget->isTargetWindows() && !Subtarget->isTargetCygMing()) {
// Setup Windows compiler runtime calls.
setLibcallName(RTLIB::SDIV_I64, "_alldiv");
setLibcallName(RTLIB::UDIV_I64, "_aulldiv");
setLibcallName(RTLIB::SREM_I64, "_allrem");
setLibcallName(RTLIB::UREM_I64, "_aullrem");
setLibcallName(RTLIB::MUL_I64, "_allmul");
setLibcallCallingConv(RTLIB::SDIV_I64, CallingConv::X86_StdCall);
setLibcallCallingConv(RTLIB::UDIV_I64, CallingConv::X86_StdCall);
setLibcallCallingConv(RTLIB::SREM_I64, CallingConv::X86_StdCall);
setLibcallCallingConv(RTLIB::UREM_I64, CallingConv::X86_StdCall);
setLibcallCallingConv(RTLIB::MUL_I64, CallingConv::X86_StdCall);
// The _ftol2 runtime function has an unusual calling conv, which
// is modeled by a special pseudo-instruction.
setLibcallName(RTLIB::FPTOUINT_F64_I64, 0);
setLibcallName(RTLIB::FPTOUINT_F32_I64, 0);
setLibcallName(RTLIB::FPTOUINT_F64_I32, 0);
setLibcallName(RTLIB::FPTOUINT_F32_I32, 0);
}
if (Subtarget->isTargetDarwin()) {
// Darwin should use _setjmp/_longjmp instead of setjmp/longjmp.
setUseUnderscoreSetJmp(false);
setUseUnderscoreLongJmp(false);
} else if (Subtarget->isTargetMingw()) {
// MS runtime is weird: it exports _setjmp, but longjmp!
setUseUnderscoreSetJmp(true);
setUseUnderscoreLongJmp(false);
} else {
setUseUnderscoreSetJmp(true);
setUseUnderscoreLongJmp(true);
}
// Set up the register classes.
addRegisterClass(MVT::i8, &X86::GR8RegClass);
addRegisterClass(MVT::i16, &X86::GR16RegClass);
addRegisterClass(MVT::i32, &X86::GR32RegClass);
if (Subtarget->is64Bit())
addRegisterClass(MVT::i64, &X86::GR64RegClass);
setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
// We don't accept any truncstore of integer registers.
setTruncStoreAction(MVT::i64, MVT::i32, Expand);
setTruncStoreAction(MVT::i64, MVT::i16, Expand);
setTruncStoreAction(MVT::i64, MVT::i8 , Expand);
setTruncStoreAction(MVT::i32, MVT::i16, Expand);
setTruncStoreAction(MVT::i32, MVT::i8 , Expand);
setTruncStoreAction(MVT::i16, MVT::i8, Expand);
// SETOEQ and SETUNE require checking two conditions.
setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand);
setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand);
setCondCodeAction(ISD::SETOEQ, MVT::f80, Expand);
setCondCodeAction(ISD::SETUNE, MVT::f32, Expand);
setCondCodeAction(ISD::SETUNE, MVT::f64, Expand);
setCondCodeAction(ISD::SETUNE, MVT::f80, Expand);
// Promote all UINT_TO_FP to larger SINT_TO_FP's, as X86 doesn't have this
// operation.
setOperationAction(ISD::UINT_TO_FP , MVT::i1 , Promote);
setOperationAction(ISD::UINT_TO_FP , MVT::i8 , Promote);
setOperationAction(ISD::UINT_TO_FP , MVT::i16 , Promote);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::UINT_TO_FP , MVT::i32 , Promote);
setOperationAction(ISD::UINT_TO_FP , MVT::i64 , Custom);
} else if (!TM.Options.UseSoftFloat) {
// We have an algorithm for SSE2->double, and we turn this into a
// 64-bit FILD followed by conditional FADD for other targets.
setOperationAction(ISD::UINT_TO_FP , MVT::i64 , Custom);
// We have an algorithm for SSE2, and we turn this into a 64-bit
// FILD for other targets.
setOperationAction(ISD::UINT_TO_FP , MVT::i32 , Custom);
}
// Promote i1/i8 SINT_TO_FP to larger SINT_TO_FP's, as X86 doesn't have
// this operation.
setOperationAction(ISD::SINT_TO_FP , MVT::i1 , Promote);
setOperationAction(ISD::SINT_TO_FP , MVT::i8 , Promote);
if (!TM.Options.UseSoftFloat) {
// SSE has no i16 to fp conversion, only i32
if (X86ScalarSSEf32) {
setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Promote);
// f32 and f64 cases are Legal, f80 case is not
setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Custom);
} else {
setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Custom);
setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Custom);
}
} else {
setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Promote);
setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Promote);
}
// In 32-bit mode these are custom lowered. In 64-bit mode F32 and F64
// are Legal, f80 is custom lowered.
setOperationAction(ISD::FP_TO_SINT , MVT::i64 , Custom);
setOperationAction(ISD::SINT_TO_FP , MVT::i64 , Custom);
// Promote i1/i8 FP_TO_SINT to larger FP_TO_SINTS's, as X86 doesn't have
// this operation.
setOperationAction(ISD::FP_TO_SINT , MVT::i1 , Promote);
setOperationAction(ISD::FP_TO_SINT , MVT::i8 , Promote);
if (X86ScalarSSEf32) {
setOperationAction(ISD::FP_TO_SINT , MVT::i16 , Promote);
// f32 and f64 cases are Legal, f80 case is not
setOperationAction(ISD::FP_TO_SINT , MVT::i32 , Custom);
} else {
setOperationAction(ISD::FP_TO_SINT , MVT::i16 , Custom);
setOperationAction(ISD::FP_TO_SINT , MVT::i32 , Custom);
}
// Handle FP_TO_UINT by promoting the destination to a larger signed
// conversion.
setOperationAction(ISD::FP_TO_UINT , MVT::i1 , Promote);
setOperationAction(ISD::FP_TO_UINT , MVT::i8 , Promote);
setOperationAction(ISD::FP_TO_UINT , MVT::i16 , Promote);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::FP_TO_UINT , MVT::i64 , Expand);
setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Promote);
} else if (!TM.Options.UseSoftFloat) {
// Since AVX is a superset of SSE3, only check for SSE here.
if (Subtarget->hasSSE1() && !Subtarget->hasSSE3())
// Expand FP_TO_UINT into a select.
// FIXME: We would like to use a Custom expander here eventually to do
// the optimal thing for SSE vs. the default expansion in the legalizer.
setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Expand);
else
// With SSE3 we can use fisttpll to convert to a signed i64; without
// SSE, we're stuck with a fistpll.
setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Custom);
}
if (isTargetFTOL()) {
// Use the _ftol2 runtime function, which has a pseudo-instruction
// to handle its weird calling convention.
setOperationAction(ISD::FP_TO_UINT , MVT::i64 , Custom);
}
// TODO: when we have SSE, these could be more efficient, by using movd/movq.
if (!X86ScalarSSEf64) {
setOperationAction(ISD::BITCAST , MVT::f32 , Expand);
setOperationAction(ISD::BITCAST , MVT::i32 , Expand);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::BITCAST , MVT::f64 , Expand);
// Without SSE, i64->f64 goes through memory.
setOperationAction(ISD::BITCAST , MVT::i64 , Expand);
}
}
// Scalar integer divide and remainder are lowered to use operations that
// produce two results, to match the available instructions. This exposes
// the two-result form to trivial CSE, which is able to combine x/y and x%y
// into a single instruction.
//
// Scalar integer multiply-high is also lowered to use two-result
// operations, to match the available instructions. However, plain multiply
// (low) operations are left as Legal, as there are single-result
// instructions for this in x86. Using the two-result multiply instructions
// when both high and low results are needed must be arranged by dagcombine.
for (unsigned i = 0; i != array_lengthof(IntVTs); ++i) {
MVT VT = IntVTs[i];
setOperationAction(ISD::MULHS, VT, Expand);
setOperationAction(ISD::MULHU, VT, Expand);
setOperationAction(ISD::SDIV, VT, Expand);
setOperationAction(ISD::UDIV, VT, Expand);
setOperationAction(ISD::SREM, VT, Expand);
setOperationAction(ISD::UREM, VT, Expand);
// Add/Sub overflow ops with MVT::Glues are lowered to EFLAGS dependences.
setOperationAction(ISD::ADDC, VT, Custom);
setOperationAction(ISD::ADDE, VT, Custom);
setOperationAction(ISD::SUBC, VT, Custom);
setOperationAction(ISD::SUBE, VT, Custom);
}
setOperationAction(ISD::BR_JT , MVT::Other, Expand);
setOperationAction(ISD::BRCOND , MVT::Other, Custom);
setOperationAction(ISD::BR_CC , MVT::Other, Expand);
setOperationAction(ISD::SELECT_CC , MVT::Other, Expand);
if (Subtarget->is64Bit())
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i32, Legal);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16 , Legal);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Legal);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
setOperationAction(ISD::FP_ROUND_INREG , MVT::f32 , Expand);
setOperationAction(ISD::FREM , MVT::f32 , Expand);
setOperationAction(ISD::FREM , MVT::f64 , Expand);
setOperationAction(ISD::FREM , MVT::f80 , Expand);
setOperationAction(ISD::FLT_ROUNDS_ , MVT::i32 , Custom);
// Promote the i8 variants and force them on up to i32 which has a shorter
// encoding.
setOperationAction(ISD::CTTZ , MVT::i8 , Promote);
AddPromotedToType (ISD::CTTZ , MVT::i8 , MVT::i32);
setOperationAction(ISD::CTTZ_ZERO_UNDEF , MVT::i8 , Promote);
AddPromotedToType (ISD::CTTZ_ZERO_UNDEF , MVT::i8 , MVT::i32);
if (Subtarget->hasBMI()) {
setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i16 , Expand);
setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32 , Expand);
if (Subtarget->is64Bit())
setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i64, Expand);
} else {
setOperationAction(ISD::CTTZ , MVT::i16 , Custom);
setOperationAction(ISD::CTTZ , MVT::i32 , Custom);
if (Subtarget->is64Bit())
setOperationAction(ISD::CTTZ , MVT::i64 , Custom);
}
if (Subtarget->hasLZCNT()) {
// When promoting the i8 variants, force them to i32 for a shorter
// encoding.
setOperationAction(ISD::CTLZ , MVT::i8 , Promote);
AddPromotedToType (ISD::CTLZ , MVT::i8 , MVT::i32);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i8 , Promote);
AddPromotedToType (ISD::CTLZ_ZERO_UNDEF, MVT::i8 , MVT::i32);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16 , Expand);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32 , Expand);
if (Subtarget->is64Bit())
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand);
} else {
setOperationAction(ISD::CTLZ , MVT::i8 , Custom);
setOperationAction(ISD::CTLZ , MVT::i16 , Custom);
setOperationAction(ISD::CTLZ , MVT::i32 , Custom);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i8 , Custom);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16 , Custom);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32 , Custom);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::CTLZ , MVT::i64 , Custom);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Custom);
}
}
if (Subtarget->hasPOPCNT()) {
setOperationAction(ISD::CTPOP , MVT::i8 , Promote);
} else {
setOperationAction(ISD::CTPOP , MVT::i8 , Expand);
setOperationAction(ISD::CTPOP , MVT::i16 , Expand);
setOperationAction(ISD::CTPOP , MVT::i32 , Expand);
if (Subtarget->is64Bit())
setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
}
setOperationAction(ISD::READCYCLECOUNTER , MVT::i64 , Custom);
setOperationAction(ISD::BSWAP , MVT::i16 , Expand);
// These should be promoted to a larger select which is supported.
setOperationAction(ISD::SELECT , MVT::i1 , Promote);
// X86 wants to expand cmov itself.
setOperationAction(ISD::SELECT , MVT::i8 , Custom);
setOperationAction(ISD::SELECT , MVT::i16 , Custom);
setOperationAction(ISD::SELECT , MVT::i32 , Custom);
setOperationAction(ISD::SELECT , MVT::f32 , Custom);
setOperationAction(ISD::SELECT , MVT::f64 , Custom);
setOperationAction(ISD::SELECT , MVT::f80 , Custom);
setOperationAction(ISD::SETCC , MVT::i8 , Custom);
setOperationAction(ISD::SETCC , MVT::i16 , Custom);
setOperationAction(ISD::SETCC , MVT::i32 , Custom);
setOperationAction(ISD::SETCC , MVT::f32 , Custom);
setOperationAction(ISD::SETCC , MVT::f64 , Custom);
setOperationAction(ISD::SETCC , MVT::f80 , Custom);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::SELECT , MVT::i64 , Custom);
setOperationAction(ISD::SETCC , MVT::i64 , Custom);
}
setOperationAction(ISD::EH_RETURN , MVT::Other, Custom);
// Darwin ABI issue.
setOperationAction(ISD::ConstantPool , MVT::i32 , Custom);
setOperationAction(ISD::JumpTable , MVT::i32 , Custom);
setOperationAction(ISD::GlobalAddress , MVT::i32 , Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i32 , Custom);
if (Subtarget->is64Bit())
setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
setOperationAction(ISD::ExternalSymbol , MVT::i32 , Custom);
setOperationAction(ISD::BlockAddress , MVT::i32 , Custom);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::ConstantPool , MVT::i64 , Custom);
setOperationAction(ISD::JumpTable , MVT::i64 , Custom);
setOperationAction(ISD::GlobalAddress , MVT::i64 , Custom);
setOperationAction(ISD::ExternalSymbol, MVT::i64 , Custom);
setOperationAction(ISD::BlockAddress , MVT::i64 , Custom);
}
// 64-bit addm sub, shl, sra, srl (iff 32-bit x86)
setOperationAction(ISD::SHL_PARTS , MVT::i32 , Custom);
setOperationAction(ISD::SRA_PARTS , MVT::i32 , Custom);
setOperationAction(ISD::SRL_PARTS , MVT::i32 , Custom);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::SHL_PARTS , MVT::i64 , Custom);
setOperationAction(ISD::SRA_PARTS , MVT::i64 , Custom);
setOperationAction(ISD::SRL_PARTS , MVT::i64 , Custom);
}
if (Subtarget->hasSSE1())
setOperationAction(ISD::PREFETCH , MVT::Other, Legal);
setOperationAction(ISD::MEMBARRIER , MVT::Other, Custom);
setOperationAction(ISD::ATOMIC_FENCE , MVT::Other, Custom);
// On X86 and X86-64, atomic operations are lowered to locked instructions.
// Locked instructions, in turn, have implicit fence semantics (all memory
// operations are flushed before issuing the locked instruction, and they
// are not buffered), so we can fold away the common pattern of
// fence-atomic-fence.
setShouldFoldAtomicFences(true);
// Expand certain atomics
for (unsigned i = 0; i != array_lengthof(IntVTs); ++i) {
MVT VT = IntVTs[i];
setOperationAction(ISD::ATOMIC_CMP_SWAP, VT, Custom);
setOperationAction(ISD::ATOMIC_LOAD_SUB, VT, Custom);
setOperationAction(ISD::ATOMIC_STORE, VT, Custom);
}
if (!Subtarget->is64Bit()) {
setOperationAction(ISD::ATOMIC_LOAD, MVT::i64, Custom);
setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i64, Custom);
setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i64, Custom);
setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i64, Custom);
setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i64, Custom);
setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i64, Custom);
setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i64, Custom);
setOperationAction(ISD::ATOMIC_SWAP, MVT::i64, Custom);
}
if (Subtarget->hasCmpxchg16b()) {
setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i128, Custom);
}
// FIXME - use subtarget debug flags
if (!Subtarget->isTargetDarwin() &&
!Subtarget->isTargetELF() &&
!Subtarget->isTargetCygMing()) {
setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
}
setOperationAction(ISD::EXCEPTIONADDR, MVT::i64, Expand);
setOperationAction(ISD::EHSELECTION, MVT::i64, Expand);
setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
if (Subtarget->is64Bit()) {
setExceptionPointerRegister(X86::RAX);
setExceptionSelectorRegister(X86::RDX);
} else {
setExceptionPointerRegister(X86::EAX);
setExceptionSelectorRegister(X86::EDX);
}
setOperationAction(ISD::FRAME_TO_ARGS_OFFSET, MVT::i32, Custom);
setOperationAction(ISD::FRAME_TO_ARGS_OFFSET, MVT::i64, Custom);
setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
setOperationAction(ISD::TRAP, MVT::Other, Legal);
// VASTART needs to be custom lowered to use the VarArgsFrameIndex
setOperationAction(ISD::VASTART , MVT::Other, Custom);
setOperationAction(ISD::VAEND , MVT::Other, Expand);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::VAARG , MVT::Other, Custom);
setOperationAction(ISD::VACOPY , MVT::Other, Custom);
} else {
setOperationAction(ISD::VAARG , MVT::Other, Expand);
setOperationAction(ISD::VACOPY , MVT::Other, Expand);
}
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
if (Subtarget->isTargetCOFF() && !Subtarget->isTargetEnvMacho())
setOperationAction(ISD::DYNAMIC_STACKALLOC, Subtarget->is64Bit() ?
MVT::i64 : MVT::i32, Custom);
else if (TM.Options.EnableSegmentedStacks)
setOperationAction(ISD::DYNAMIC_STACKALLOC, Subtarget->is64Bit() ?
MVT::i64 : MVT::i32, Custom);
else
setOperationAction(ISD::DYNAMIC_STACKALLOC, Subtarget->is64Bit() ?
MVT::i64 : MVT::i32, Expand);
if (!TM.Options.UseSoftFloat && X86ScalarSSEf64) {
// f32 and f64 use SSE.
// Set up the FP register classes.
addRegisterClass(MVT::f32, &X86::FR32RegClass);
addRegisterClass(MVT::f64, &X86::FR64RegClass);
// Use ANDPD to simulate FABS.
setOperationAction(ISD::FABS , MVT::f64, Custom);
setOperationAction(ISD::FABS , MVT::f32, Custom);
// Use XORP to simulate FNEG.
setOperationAction(ISD::FNEG , MVT::f64, Custom);
setOperationAction(ISD::FNEG , MVT::f32, Custom);
// Use ANDPD and ORPD to simulate FCOPYSIGN.
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
// Lower this to FGETSIGNx86 plus an AND.
setOperationAction(ISD::FGETSIGN, MVT::i64, Custom);
setOperationAction(ISD::FGETSIGN, MVT::i32, Custom);
// We don't support sin/cos/fmod
setOperationAction(ISD::FSIN , MVT::f64, Expand);
setOperationAction(ISD::FCOS , MVT::f64, Expand);
setOperationAction(ISD::FSIN , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f32, Expand);
// Expand FP immediates into loads from the stack, except for the special
// cases we handle.
addLegalFPImmediate(APFloat(+0.0)); // xorpd
addLegalFPImmediate(APFloat(+0.0f)); // xorps
} else if (!TM.Options.UseSoftFloat && X86ScalarSSEf32) {
// Use SSE for f32, x87 for f64.
// Set up the FP register classes.
addRegisterClass(MVT::f32, &X86::FR32RegClass);
addRegisterClass(MVT::f64, &X86::RFP64RegClass);
// Use ANDPS to simulate FABS.
setOperationAction(ISD::FABS , MVT::f32, Custom);
// Use XORP to simulate FNEG.
setOperationAction(ISD::FNEG , MVT::f32, Custom);
setOperationAction(ISD::UNDEF, MVT::f64, Expand);
// Use ANDPS and ORPS to simulate FCOPYSIGN.
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
// We don't support sin/cos/fmod
setOperationAction(ISD::FSIN , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f32, Expand);
// Special cases we handle for FP constants.
addLegalFPImmediate(APFloat(+0.0f)); // xorps
addLegalFPImmediate(APFloat(+0.0)); // FLD0
addLegalFPImmediate(APFloat(+1.0)); // FLD1
addLegalFPImmediate(APFloat(-0.0)); // FLD0/FCHS
addLegalFPImmediate(APFloat(-1.0)); // FLD1/FCHS
if (!TM.Options.UnsafeFPMath) {
setOperationAction(ISD::FSIN , MVT::f64 , Expand);
setOperationAction(ISD::FCOS , MVT::f64 , Expand);
}
} else if (!TM.Options.UseSoftFloat) {
// f32 and f64 in x87.
// Set up the FP register classes.
addRegisterClass(MVT::f64, &X86::RFP64RegClass);
addRegisterClass(MVT::f32, &X86::RFP32RegClass);
setOperationAction(ISD::UNDEF, MVT::f64, Expand);
setOperationAction(ISD::UNDEF, MVT::f32, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
if (!TM.Options.UnsafeFPMath) {
setOperationAction(ISD::FSIN , MVT::f64 , Expand);
setOperationAction(ISD::FCOS , MVT::f64 , Expand);
}
addLegalFPImmediate(APFloat(+0.0)); // FLD0
addLegalFPImmediate(APFloat(+1.0)); // FLD1
addLegalFPImmediate(APFloat(-0.0)); // FLD0/FCHS
addLegalFPImmediate(APFloat(-1.0)); // FLD1/FCHS
addLegalFPImmediate(APFloat(+0.0f)); // FLD0
addLegalFPImmediate(APFloat(+1.0f)); // FLD1
addLegalFPImmediate(APFloat(-0.0f)); // FLD0/FCHS
addLegalFPImmediate(APFloat(-1.0f)); // FLD1/FCHS
}
// We don't support FMA.
setOperationAction(ISD::FMA, MVT::f64, Expand);
setOperationAction(ISD::FMA, MVT::f32, Expand);
// Long double always uses X87.
if (!TM.Options.UseSoftFloat) {
addRegisterClass(MVT::f80, &X86::RFP80RegClass);
setOperationAction(ISD::UNDEF, MVT::f80, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f80, Expand);
{
APFloat TmpFlt = APFloat::getZero(APFloat::x87DoubleExtended);
addLegalFPImmediate(TmpFlt); // FLD0
TmpFlt.changeSign();
addLegalFPImmediate(TmpFlt); // FLD0/FCHS
bool ignored;
APFloat TmpFlt2(+1.0);
TmpFlt2.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven,
&ignored);
addLegalFPImmediate(TmpFlt2); // FLD1
TmpFlt2.changeSign();
addLegalFPImmediate(TmpFlt2); // FLD1/FCHS
}
if (!TM.Options.UnsafeFPMath) {
setOperationAction(ISD::FSIN , MVT::f80 , Expand);
setOperationAction(ISD::FCOS , MVT::f80 , Expand);
}
setOperationAction(ISD::FFLOOR, MVT::f80, Expand);
setOperationAction(ISD::FCEIL, MVT::f80, Expand);
setOperationAction(ISD::FTRUNC, MVT::f80, Expand);
setOperationAction(ISD::FRINT, MVT::f80, Expand);
setOperationAction(ISD::FNEARBYINT, MVT::f80, Expand);
setOperationAction(ISD::FMA, MVT::f80, Expand);
}
// Always use a library call for pow.
setOperationAction(ISD::FPOW , MVT::f32 , Expand);
setOperationAction(ISD::FPOW , MVT::f64 , Expand);
setOperationAction(ISD::FPOW , MVT::f80 , Expand);
setOperationAction(ISD::FLOG, MVT::f80, Expand);
setOperationAction(ISD::FLOG2, MVT::f80, Expand);
setOperationAction(ISD::FLOG10, MVT::f80, Expand);
setOperationAction(ISD::FEXP, MVT::f80, Expand);
setOperationAction(ISD::FEXP2, MVT::f80, Expand);
// First set operation action for all vector types to either promote
// (for widening) or expand (for scalarization). Then we will selectively
// turn on ones that can be effectively codegen'd.
for (int VT = MVT::FIRST_VECTOR_VALUETYPE;
VT <= MVT::LAST_VECTOR_VALUETYPE; ++VT) {
setOperationAction(ISD::ADD , (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SUB , (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FADD, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FNEG, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FSUB, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::MUL , (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FMUL, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SDIV, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::UDIV, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FDIV, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SREM, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::UREM, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::LOAD, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::VECTOR_SHUFFLE, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::EXTRACT_VECTOR_ELT,(MVT::SimpleValueType)VT,Expand);
setOperationAction(ISD::INSERT_VECTOR_ELT,(MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::EXTRACT_SUBVECTOR,(MVT::SimpleValueType)VT,Expand);
setOperationAction(ISD::INSERT_SUBVECTOR,(MVT::SimpleValueType)VT,Expand);
setOperationAction(ISD::FABS, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FSIN, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FCOS, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FREM, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FPOWI, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FSQRT, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FCOPYSIGN, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SMUL_LOHI, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::UMUL_LOHI, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SDIVREM, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::UDIVREM, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FPOW, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::CTPOP, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::CTTZ, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::CTTZ_ZERO_UNDEF, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::CTLZ, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SHL, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SRA, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SRL, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::ROTL, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::ROTR, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::BSWAP, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SETCC, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FLOG, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FLOG2, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FLOG10, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FEXP, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FEXP2, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FP_TO_UINT, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::FP_TO_SINT, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::UINT_TO_FP, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SINT_TO_FP, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, (MVT::SimpleValueType)VT,Expand);
setOperationAction(ISD::TRUNCATE, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::SIGN_EXTEND, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::ZERO_EXTEND, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::ANY_EXTEND, (MVT::SimpleValueType)VT, Expand);
setOperationAction(ISD::VSELECT, (MVT::SimpleValueType)VT, Expand);
for (int InnerVT = MVT::FIRST_VECTOR_VALUETYPE;
InnerVT <= MVT::LAST_VECTOR_VALUETYPE; ++InnerVT)
setTruncStoreAction((MVT::SimpleValueType)VT,
(MVT::SimpleValueType)InnerVT, Expand);
setLoadExtAction(ISD::SEXTLOAD, (MVT::SimpleValueType)VT, Expand);
setLoadExtAction(ISD::ZEXTLOAD, (MVT::SimpleValueType)VT, Expand);
setLoadExtAction(ISD::EXTLOAD, (MVT::SimpleValueType)VT, Expand);
}
// FIXME: In order to prevent SSE instructions being expanded to MMX ones
// with -msoft-float, disable use of MMX as well.
if (!TM.Options.UseSoftFloat && Subtarget->hasMMX()) {
addRegisterClass(MVT::x86mmx, &X86::VR64RegClass);
// No operations on x86mmx supported, everything uses intrinsics.
}
// MMX-sized vectors (other than x86mmx) are expected to be expanded
// into smaller operations.
setOperationAction(ISD::MULHS, MVT::v8i8, Expand);
setOperationAction(ISD::MULHS, MVT::v4i16, Expand);
setOperationAction(ISD::MULHS, MVT::v2i32, Expand);
setOperationAction(ISD::MULHS, MVT::v1i64, Expand);
setOperationAction(ISD::AND, MVT::v8i8, Expand);
setOperationAction(ISD::AND, MVT::v4i16, Expand);
setOperationAction(ISD::AND, MVT::v2i32, Expand);
setOperationAction(ISD::AND, MVT::v1i64, Expand);
setOperationAction(ISD::OR, MVT::v8i8, Expand);
setOperationAction(ISD::OR, MVT::v4i16, Expand);
setOperationAction(ISD::OR, MVT::v2i32, Expand);
setOperationAction(ISD::OR, MVT::v1i64, Expand);
setOperationAction(ISD::XOR, MVT::v8i8, Expand);
setOperationAction(ISD::XOR, MVT::v4i16, Expand);
setOperationAction(ISD::XOR, MVT::v2i32, Expand);
setOperationAction(ISD::XOR, MVT::v1i64, Expand);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i8, Expand);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i16, Expand);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v2i32, Expand);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v1i64, Expand);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v1i64, Expand);
setOperationAction(ISD::SELECT, MVT::v8i8, Expand);
setOperationAction(ISD::SELECT, MVT::v4i16, Expand);
setOperationAction(ISD::SELECT, MVT::v2i32, Expand);
setOperationAction(ISD::SELECT, MVT::v1i64, Expand);
setOperationAction(ISD::BITCAST, MVT::v8i8, Expand);
setOperationAction(ISD::BITCAST, MVT::v4i16, Expand);
setOperationAction(ISD::BITCAST, MVT::v2i32, Expand);
setOperationAction(ISD::BITCAST, MVT::v1i64, Expand);
if (!TM.Options.UseSoftFloat && Subtarget->hasSSE1()) {
addRegisterClass(MVT::v4f32, &X86::VR128RegClass);
setOperationAction(ISD::FADD, MVT::v4f32, Legal);
setOperationAction(ISD::FSUB, MVT::v4f32, Legal);
setOperationAction(ISD::FMUL, MVT::v4f32, Legal);
setOperationAction(ISD::FDIV, MVT::v4f32, Legal);
setOperationAction(ISD::FSQRT, MVT::v4f32, Legal);
setOperationAction(ISD::FNEG, MVT::v4f32, Custom);
setOperationAction(ISD::LOAD, MVT::v4f32, Legal);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v4f32, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Custom);
setOperationAction(ISD::SELECT, MVT::v4f32, Custom);
setOperationAction(ISD::SETCC, MVT::v4f32, Custom);
}
if (!TM.Options.UseSoftFloat && Subtarget->hasSSE2()) {
addRegisterClass(MVT::v2f64, &X86::VR128RegClass);
// FIXME: Unfortunately -soft-float and -no-implicit-float means XMM
// registers cannot be used even for integer operations.
addRegisterClass(MVT::v16i8, &X86::VR128RegClass);
addRegisterClass(MVT::v8i16, &X86::VR128RegClass);
addRegisterClass(MVT::v4i32, &X86::VR128RegClass);
addRegisterClass(MVT::v2i64, &X86::VR128RegClass);
setOperationAction(ISD::ADD, MVT::v16i8, Legal);
setOperationAction(ISD::ADD, MVT::v8i16, Legal);
setOperationAction(ISD::ADD, MVT::v4i32, Legal);
setOperationAction(ISD::ADD, MVT::v2i64, Legal);
setOperationAction(ISD::MUL, MVT::v2i64, Custom);
setOperationAction(ISD::SUB, MVT::v16i8, Legal);
setOperationAction(ISD::SUB, MVT::v8i16, Legal);
setOperationAction(ISD::SUB, MVT::v4i32, Legal);
setOperationAction(ISD::SUB, MVT::v2i64, Legal);
setOperationAction(ISD::MUL, MVT::v8i16, Legal);
setOperationAction(ISD::FADD, MVT::v2f64, Legal);
setOperationAction(ISD::FSUB, MVT::v2f64, Legal);
setOperationAction(ISD::FMUL, MVT::v2f64, Legal);
setOperationAction(ISD::FDIV, MVT::v2f64, Legal);
setOperationAction(ISD::FSQRT, MVT::v2f64, Legal);
setOperationAction(ISD::FNEG, MVT::v2f64, Custom);
setOperationAction(ISD::SETCC, MVT::v2i64, Custom);
setOperationAction(ISD::SETCC, MVT::v16i8, Custom);
setOperationAction(ISD::SETCC, MVT::v8i16, Custom);
setOperationAction(ISD::SETCC, MVT::v4i32, Custom);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v16i8, Custom);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i16, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v2f64, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v2i64, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v16i8, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v8i16, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v4i32, Custom);
// Custom lower build_vector, vector_shuffle, and extract_vector_elt.
for (int i = MVT::v16i8; i != MVT::v2i64; ++i) {
EVT VT = (MVT::SimpleValueType)i;
// Do not attempt to custom lower non-power-of-2 vectors
if (!isPowerOf2_32(VT.getVectorNumElements()))
continue;
// Do not attempt to custom lower non-128-bit vectors
if (!VT.is128BitVector())
continue;
setOperationAction(ISD::BUILD_VECTOR,
VT.getSimpleVT().SimpleTy, Custom);
setOperationAction(ISD::VECTOR_SHUFFLE,
VT.getSimpleVT().SimpleTy, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT,
VT.getSimpleVT().SimpleTy, Custom);
}
setOperationAction(ISD::BUILD_VECTOR, MVT::v2f64, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v2i64, Custom);
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2f64, Custom);
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2i64, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2f64, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f64, Custom);
if (Subtarget->is64Bit()) {
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i64, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i64, Custom);
}
// Promote v16i8, v8i16, v4i32 load, select, and, or, xor to v2i64.
for (int i = MVT::v16i8; i != MVT::v2i64; i++) {
MVT::SimpleValueType SVT = (MVT::SimpleValueType)i;
EVT VT = SVT;
// Do not attempt to promote non-128-bit vectors
if (!VT.is128BitVector())
continue;
setOperationAction(ISD::AND, SVT, Promote);
AddPromotedToType (ISD::AND, SVT, MVT::v2i64);
setOperationAction(ISD::OR, SVT, Promote);
AddPromotedToType (ISD::OR, SVT, MVT::v2i64);
setOperationAction(ISD::XOR, SVT, Promote);
AddPromotedToType (ISD::XOR, SVT, MVT::v2i64);
setOperationAction(ISD::LOAD, SVT, Promote);
AddPromotedToType (ISD::LOAD, SVT, MVT::v2i64);
setOperationAction(ISD::SELECT, SVT, Promote);
AddPromotedToType (ISD::SELECT, SVT, MVT::v2i64);
}
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
// Custom lower v2i64 and v2f64 selects.
setOperationAction(ISD::LOAD, MVT::v2f64, Legal);
setOperationAction(ISD::LOAD, MVT::v2i64, Legal);
setOperationAction(ISD::SELECT, MVT::v2f64, Custom);
setOperationAction(ISD::SELECT, MVT::v2i64, Custom);
setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Legal);
setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Legal);
}
if (Subtarget->hasSSE41()) {
setOperationAction(ISD::FFLOOR, MVT::f32, Legal);
setOperationAction(ISD::FCEIL, MVT::f32, Legal);
setOperationAction(ISD::FTRUNC, MVT::f32, Legal);
setOperationAction(ISD::FRINT, MVT::f32, Legal);
setOperationAction(ISD::FNEARBYINT, MVT::f32, Legal);
setOperationAction(ISD::FFLOOR, MVT::f64, Legal);
setOperationAction(ISD::FCEIL, MVT::f64, Legal);
setOperationAction(ISD::FTRUNC, MVT::f64, Legal);
setOperationAction(ISD::FRINT, MVT::f64, Legal);
setOperationAction(ISD::FNEARBYINT, MVT::f64, Legal);
// FIXME: Do we need to handle scalar-to-vector here?
setOperationAction(ISD::MUL, MVT::v4i32, Legal);
setOperationAction(ISD::VSELECT, MVT::v2f64, Legal);
setOperationAction(ISD::VSELECT, MVT::v2i64, Legal);
setOperationAction(ISD::VSELECT, MVT::v16i8, Legal);
setOperationAction(ISD::VSELECT, MVT::v4i32, Legal);
setOperationAction(ISD::VSELECT, MVT::v4f32, Legal);
// i8 and i16 vectors are custom , because the source register and source
// source memory operand types are not the same width. f32 vectors are
// custom since the immediate controlling the insert encodes additional
// information.
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v16i8, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v16i8, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v8i16, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i32, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Custom);
// FIXME: these should be Legal but thats only for the case where
// the index is constant. For now custom expand to deal with that.
if (Subtarget->is64Bit()) {
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i64, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i64, Custom);
}
}
if (Subtarget->hasSSE2()) {
setOperationAction(ISD::SRL, MVT::v8i16, Custom);
setOperationAction(ISD::SRL, MVT::v16i8, Custom);
setOperationAction(ISD::SHL, MVT::v8i16, Custom);
setOperationAction(ISD::SHL, MVT::v16i8, Custom);
setOperationAction(ISD::SRA, MVT::v8i16, Custom);
setOperationAction(ISD::SRA, MVT::v16i8, Custom);
if (Subtarget->hasAVX2()) {
setOperationAction(ISD::SRL, MVT::v2i64, Legal);
setOperationAction(ISD::SRL, MVT::v4i32, Legal);
setOperationAction(ISD::SHL, MVT::v2i64, Legal);
setOperationAction(ISD::SHL, MVT::v4i32, Legal);
setOperationAction(ISD::SRA, MVT::v4i32, Legal);
} else {
setOperationAction(ISD::SRL, MVT::v2i64, Custom);
setOperationAction(ISD::SRL, MVT::v4i32, Custom);
setOperationAction(ISD::SHL, MVT::v2i64, Custom);
setOperationAction(ISD::SHL, MVT::v4i32, Custom);
setOperationAction(ISD::SRA, MVT::v4i32, Custom);
}
}
if (Subtarget->hasSSE42())
setOperationAction(ISD::SETCC, MVT::v2i64, Custom);
if (!TM.Options.UseSoftFloat && Subtarget->hasAVX()) {
addRegisterClass(MVT::v32i8, &X86::VR256RegClass);
addRegisterClass(MVT::v16i16, &X86::VR256RegClass);
addRegisterClass(MVT::v8i32, &X86::VR256RegClass);
addRegisterClass(MVT::v8f32, &X86::VR256RegClass);
addRegisterClass(MVT::v4i64, &X86::VR256RegClass);
addRegisterClass(MVT::v4f64, &X86::VR256RegClass);
setOperationAction(ISD::LOAD, MVT::v8f32, Legal);
setOperationAction(ISD::LOAD, MVT::v4f64, Legal);
setOperationAction(ISD::LOAD, MVT::v4i64, Legal);
setOperationAction(ISD::FADD, MVT::v8f32, Legal);
setOperationAction(ISD::FSUB, MVT::v8f32, Legal);
setOperationAction(ISD::FMUL, MVT::v8f32, Legal);
setOperationAction(ISD::FDIV, MVT::v8f32, Legal);
setOperationAction(ISD::FSQRT, MVT::v8f32, Legal);
setOperationAction(ISD::FNEG, MVT::v8f32, Custom);
setOperationAction(ISD::FADD, MVT::v4f64, Legal);
setOperationAction(ISD::FSUB, MVT::v4f64, Legal);
setOperationAction(ISD::FMUL, MVT::v4f64, Legal);
setOperationAction(ISD::FDIV, MVT::v4f64, Legal);
setOperationAction(ISD::FSQRT, MVT::v4f64, Legal);
setOperationAction(ISD::FNEG, MVT::v4f64, Custom);
setOperationAction(ISD::FP_TO_SINT, MVT::v8i32, Legal);
setOperationAction(ISD::SINT_TO_FP, MVT::v8i32, Legal);
setOperationAction(ISD::FP_ROUND, MVT::v4f32, Legal);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v4f64, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v4i64, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v8f32, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v8i32, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v32i8, Custom);
setOperationAction(ISD::CONCAT_VECTORS, MVT::v16i16, Custom);
setOperationAction(ISD::SRL, MVT::v16i16, Custom);
setOperationAction(ISD::SRL, MVT::v32i8, Custom);
setOperationAction(ISD::SHL, MVT::v16i16, Custom);
setOperationAction(ISD::SHL, MVT::v32i8, Custom);
setOperationAction(ISD::SRA, MVT::v16i16, Custom);
setOperationAction(ISD::SRA, MVT::v32i8, Custom);
setOperationAction(ISD::SETCC, MVT::v32i8, Custom);
setOperationAction(ISD::SETCC, MVT::v16i16, Custom);
setOperationAction(ISD::SETCC, MVT::v8i32, Custom);
setOperationAction(ISD::SETCC, MVT::v4i64, Custom);
setOperationAction(ISD::SELECT, MVT::v4f64, Custom);
setOperationAction(ISD::SELECT, MVT::v4i64, Custom);
setOperationAction(ISD::SELECT, MVT::v8f32, Custom);
setOperationAction(ISD::VSELECT, MVT::v4f64, Legal);
setOperationAction(ISD::VSELECT, MVT::v4i64, Legal);
setOperationAction(ISD::VSELECT, MVT::v8i32, Legal);
setOperationAction(ISD::VSELECT, MVT::v8f32, Legal);
if (Subtarget->hasAVX2()) {
setOperationAction(ISD::ADD, MVT::v4i64, Legal);
setOperationAction(ISD::ADD, MVT::v8i32, Legal);
setOperationAction(ISD::ADD, MVT::v16i16, Legal);
setOperationAction(ISD::ADD, MVT::v32i8, Legal);
setOperationAction(ISD::SUB, MVT::v4i64, Legal);
setOperationAction(ISD::SUB, MVT::v8i32, Legal);
setOperationAction(ISD::SUB, MVT::v16i16, Legal);
setOperationAction(ISD::SUB, MVT::v32i8, Legal);
setOperationAction(ISD::MUL, MVT::v4i64, Custom);
setOperationAction(ISD::MUL, MVT::v8i32, Legal);
setOperationAction(ISD::MUL, MVT::v16i16, Legal);
// Don't lower v32i8 because there is no 128-bit byte mul
setOperationAction(ISD::VSELECT, MVT::v32i8, Legal);
setOperationAction(ISD::SRL, MVT::v4i64, Legal);
setOperationAction(ISD::SRL, MVT::v8i32, Legal);
setOperationAction(ISD::SHL, MVT::v4i64, Legal);
setOperationAction(ISD::SHL, MVT::v8i32, Legal);
setOperationAction(ISD::SRA, MVT::v8i32, Legal);
} else {
setOperationAction(ISD::ADD, MVT::v4i64, Custom);
setOperationAction(ISD::ADD, MVT::v8i32, Custom);
setOperationAction(ISD::ADD, MVT::v16i16, Custom);
setOperationAction(ISD::ADD, MVT::v32i8, Custom);
setOperationAction(ISD::SUB, MVT::v4i64, Custom);
setOperationAction(ISD::SUB, MVT::v8i32, Custom);
setOperationAction(ISD::SUB, MVT::v16i16, Custom);
setOperationAction(ISD::SUB, MVT::v32i8, Custom);
setOperationAction(ISD::MUL, MVT::v4i64, Custom);
setOperationAction(ISD::MUL, MVT::v8i32, Custom);
setOperationAction(ISD::MUL, MVT::v16i16, Custom);
// Don't lower v32i8 because there is no 128-bit byte mul
setOperationAction(ISD::SRL, MVT::v4i64, Custom);
setOperationAction(ISD::SRL, MVT::v8i32, Custom);
setOperationAction(ISD::SHL, MVT::v4i64, Custom);
setOperationAction(ISD::SHL, MVT::v8i32, Custom);
setOperationAction(ISD::SRA, MVT::v8i32, Custom);
}
// Custom lower several nodes for 256-bit types.
for (int i = MVT::FIRST_VECTOR_VALUETYPE;
i <= MVT::LAST_VECTOR_VALUETYPE; ++i) {
MVT::SimpleValueType SVT = (MVT::SimpleValueType)i;
EVT VT = SVT;
// Extract subvector is special because the value type
// (result) is 128-bit but the source is 256-bit wide.
if (VT.is128BitVector())
setOperationAction(ISD::EXTRACT_SUBVECTOR, SVT, Custom);
// Do not attempt to custom lower other non-256-bit vectors
if (!VT.is256BitVector())
continue;
setOperationAction(ISD::BUILD_VECTOR, SVT, Custom);
setOperationAction(ISD::VECTOR_SHUFFLE, SVT, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, SVT, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, SVT, Custom);
setOperationAction(ISD::SCALAR_TO_VECTOR, SVT, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, SVT, Custom);
}
// Promote v32i8, v16i16, v8i32 select, and, or, xor to v4i64.
for (int i = MVT::v32i8; i != MVT::v4i64; ++i) {
MVT::SimpleValueType SVT = (MVT::SimpleValueType)i;
EVT VT = SVT;
// Do not attempt to promote non-256-bit vectors
if (!VT.is256BitVector())
continue;
setOperationAction(ISD::AND, SVT, Promote);
AddPromotedToType (ISD::AND, SVT, MVT::v4i64);
setOperationAction(ISD::OR, SVT, Promote);
AddPromotedToType (ISD::OR, SVT, MVT::v4i64);
setOperationAction(ISD::XOR, SVT, Promote);
AddPromotedToType (ISD::XOR, SVT, MVT::v4i64);
setOperationAction(ISD::LOAD, SVT, Promote);
AddPromotedToType (ISD::LOAD, SVT, MVT::v4i64);
setOperationAction(ISD::SELECT, SVT, Promote);
AddPromotedToType (ISD::SELECT, SVT, MVT::v4i64);
}
}
// SIGN_EXTEND_INREGs are evaluated by the extend type. Handle the expansion
// of this type with custom code.
for (int VT = MVT::FIRST_VECTOR_VALUETYPE;
VT != MVT::LAST_VECTOR_VALUETYPE; VT++) {
setOperationAction(ISD::SIGN_EXTEND_INREG, (MVT::SimpleValueType)VT,
Custom);
}
// We want to custom lower some of our intrinsics.
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
// Only custom-lower 64-bit SADDO and friends on 64-bit because we don't
// handle type legalization for these operations here.
//
// FIXME: We really should do custom legalization for addition and
// subtraction on x86-32 once PR3203 is fixed. We really can't do much better
// than generic legalization for 64-bit multiplication-with-overflow, though.
for (unsigned i = 0, e = 3+Subtarget->is64Bit(); i != e; ++i) {
// Add/Sub/Mul with overflow operations are custom lowered.
MVT VT = IntVTs[i];
setOperationAction(ISD::SADDO, VT, Custom);
setOperationAction(ISD::UADDO, VT, Custom);
setOperationAction(ISD::SSUBO, VT, Custom);
setOperationAction(ISD::USUBO, VT, Custom);
setOperationAction(ISD::SMULO, VT, Custom);
setOperationAction(ISD::UMULO, VT, Custom);
}
// There are no 8-bit 3-address imul/mul instructions
setOperationAction(ISD::SMULO, MVT::i8, Expand);
setOperationAction(ISD::UMULO, MVT::i8, Expand);
if (!Subtarget->is64Bit()) {
// These libcalls are not available in 32-bit.
setLibcallName(RTLIB::SHL_I128, 0);
setLibcallName(RTLIB::SRL_I128, 0);
setLibcallName(RTLIB::SRA_I128, 0);
}
// We have target-specific dag combine patterns for the following nodes:
setTargetDAGCombine(ISD::VECTOR_SHUFFLE);
setTargetDAGCombine(ISD::EXTRACT_VECTOR_ELT);
setTargetDAGCombine(ISD::VSELECT);
setTargetDAGCombine(ISD::SELECT);
setTargetDAGCombine(ISD::SHL);
setTargetDAGCombine(ISD::SRA);
setTargetDAGCombine(ISD::SRL);
setTargetDAGCombine(ISD::OR);
setTargetDAGCombine(ISD::AND);
setTargetDAGCombine(ISD::ADD);
setTargetDAGCombine(ISD::FADD);
setTargetDAGCombine(ISD::FSUB);
setTargetDAGCombine(ISD::SUB);
setTargetDAGCombine(ISD::LOAD);
setTargetDAGCombine(ISD::STORE);
setTargetDAGCombine(ISD::ZERO_EXTEND);
setTargetDAGCombine(ISD::ANY_EXTEND);
setTargetDAGCombine(ISD::SIGN_EXTEND);
setTargetDAGCombine(ISD::TRUNCATE);
setTargetDAGCombine(ISD::UINT_TO_FP);
setTargetDAGCombine(ISD::SINT_TO_FP);
setTargetDAGCombine(ISD::SETCC);
setTargetDAGCombine(ISD::FP_TO_SINT);
if (Subtarget->is64Bit())
setTargetDAGCombine(ISD::MUL);
if (Subtarget->hasBMI())
setTargetDAGCombine(ISD::XOR);
computeRegisterProperties();
// On Darwin, -Os means optimize for size without hurting performance,
// do not reduce the limit.
maxStoresPerMemset = 16; // For @llvm.memset -> sequence of stores
maxStoresPerMemsetOptSize = Subtarget->isTargetDarwin() ? 16 : 8;
maxStoresPerMemcpy = 8; // For @llvm.memcpy -> sequence of stores
maxStoresPerMemcpyOptSize = Subtarget->isTargetDarwin() ? 8 : 4;
maxStoresPerMemmove = 8; // For @llvm.memmove -> sequence of stores
maxStoresPerMemmoveOptSize = Subtarget->isTargetDarwin() ? 8 : 4;
setPrefLoopAlignment(4); // 2^4 bytes.
benefitFromCodePlacementOpt = true;
setPrefFunctionAlignment(4); // 2^4 bytes.
}
EVT X86TargetLowering::getSetCCResultType(EVT VT) const {
if (!VT.isVector()) return MVT::i8;
return VT.changeVectorElementTypeToInteger();
}
/// getMaxByValAlign - Helper for getByValTypeAlignment to determine
/// the desired ByVal argument alignment.
static void getMaxByValAlign(Type *Ty, unsigned &MaxAlign) {
if (MaxAlign == 16)
return;
if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
if (VTy->getBitWidth() == 128)
MaxAlign = 16;
} else if (ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
unsigned EltAlign = 0;
getMaxByValAlign(ATy->getElementType(), EltAlign);
if (EltAlign > MaxAlign)
MaxAlign = EltAlign;
} else if (StructType *STy = dyn_cast<StructType>(Ty)) {
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
unsigned EltAlign = 0;
getMaxByValAlign(STy->getElementType(i), EltAlign);
if (EltAlign > MaxAlign)
MaxAlign = EltAlign;
if (MaxAlign == 16)
break;
}
}
}
/// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
/// function arguments in the caller parameter area. For X86, aggregates
/// that contain SSE vectors are placed at 16-byte boundaries while the rest
/// are at 4-byte boundaries.
unsigned X86TargetLowering::getByValTypeAlignment(Type *Ty) const {
if (Subtarget->is64Bit()) {
// Max of 8 and alignment of type.
unsigned TyAlign = TD->getABITypeAlignment(Ty);
if (TyAlign > 8)
return TyAlign;
return 8;
}
unsigned Align = 4;
if (Subtarget->hasSSE1())
getMaxByValAlign(Ty, Align);
return Align;
}
/// getOptimalMemOpType - Returns the target specific optimal type for load
/// and store operations as a result of memset, memcpy, and memmove
/// lowering. If DstAlign is zero that means it's safe to destination
/// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
/// means there isn't a need to check it against alignment requirement,
/// probably because the source does not need to be loaded. If
/// 'IsZeroVal' is true, that means it's safe to return a
/// non-scalar-integer type, e.g. empty string source, constant, or loaded
/// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
/// constant so it does not need to be loaded.
/// It returns EVT::Other if the type should be determined using generic
/// target-independent logic.
EVT
X86TargetLowering::getOptimalMemOpType(uint64_t Size,
unsigned DstAlign, unsigned SrcAlign,
bool IsZeroVal,
bool MemcpyStrSrc,
MachineFunction &MF) const {
// FIXME: This turns off use of xmm stores for memset/memcpy on targets like
// linux. This is because the stack realignment code can't handle certain
// cases like PR2962. This should be removed when PR2962 is fixed.
const Function *F = MF.getFunction();
if (IsZeroVal &&
!F->hasFnAttr(Attribute::NoImplicitFloat)) {
if (Size >= 16 &&
(Subtarget->isUnalignedMemAccessFast() ||
((DstAlign == 0 || DstAlign >= 16) &&
(SrcAlign == 0 || SrcAlign >= 16))) &&
Subtarget->getStackAlignment() >= 16) {
if (Subtarget->getStackAlignment() >= 32) {
if (Subtarget->hasAVX2())
return MVT::v8i32;
if (Subtarget->hasAVX())
return MVT::v8f32;
}
if (Subtarget->hasSSE2())
return MVT::v4i32;
if (Subtarget->hasSSE1())
return MVT::v4f32;
} else if (!MemcpyStrSrc && Size >= 8 &&
!Subtarget->is64Bit() &&
Subtarget->getStackAlignment() >= 8 &&
Subtarget->hasSSE2()) {
// Do not use f64 to lower memcpy if source is string constant. It's
// better to use i32 to avoid the loads.
return MVT::f64;
}
}
if (Subtarget->is64Bit() && Size >= 8)
return MVT::i64;
return MVT::i32;
}
/// getJumpTableEncoding - Return the entry encoding for a jump table in the
/// current function. The returned value is a member of the
/// MachineJumpTableInfo::JTEntryKind enum.
unsigned X86TargetLowering::getJumpTableEncoding() const {
// In GOT pic mode, each entry in the jump table is emitted as a @GOTOFF
// symbol.
if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
Subtarget->isPICStyleGOT())
return MachineJumpTableInfo::EK_Custom32;
// Otherwise, use the normal jump table encoding heuristics.
return TargetLowering::getJumpTableEncoding();
}
const MCExpr *
X86TargetLowering::LowerCustomJumpTableEntry(const MachineJumpTableInfo *MJTI,
const MachineBasicBlock *MBB,
unsigned uid,MCContext &Ctx) const{
assert(getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
Subtarget->isPICStyleGOT());
// In 32-bit ELF systems, our jump table entries are formed with @GOTOFF
// entries.
return MCSymbolRefExpr::Create(MBB->getSymbol(),
MCSymbolRefExpr::VK_GOTOFF, Ctx);
}
/// getPICJumpTableRelocaBase - Returns relocation base for the given PIC
/// jumptable.
SDValue X86TargetLowering::getPICJumpTableRelocBase(SDValue Table,
SelectionDAG &DAG) const {
if (!Subtarget->is64Bit())
// This doesn't have DebugLoc associated with it, but is not really the
// same as a Register.
return DAG.getNode(X86ISD::GlobalBaseReg, DebugLoc(), getPointerTy());
return Table;
}
/// getPICJumpTableRelocBaseExpr - This returns the relocation base for the
/// given PIC jumptable, the same as getPICJumpTableRelocBase, but as an
/// MCExpr.
const MCExpr *X86TargetLowering::
getPICJumpTableRelocBaseExpr(const MachineFunction *MF, unsigned JTI,
MCContext &Ctx) const {
// X86-64 uses RIP relative addressing based on the jump table label.
if (Subtarget->isPICStyleRIPRel())
return TargetLowering::getPICJumpTableRelocBaseExpr(MF, JTI, Ctx);
// Otherwise, the reference is relative to the PIC base.
return MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), Ctx);
}
// FIXME: Why this routine is here? Move to RegInfo!
std::pair<const TargetRegisterClass*, uint8_t>
X86TargetLowering::findRepresentativeClass(EVT VT) const{
const TargetRegisterClass *RRC = 0;
uint8_t Cost = 1;
switch (VT.getSimpleVT().SimpleTy) {
default:
return TargetLowering::findRepresentativeClass(VT);
case MVT::i8: case MVT::i16: case MVT::i32: case MVT::i64:
RRC = Subtarget->is64Bit() ?
(const TargetRegisterClass*)&X86::GR64RegClass :
(const TargetRegisterClass*)&X86::GR32RegClass;
break;
case MVT::x86mmx:
RRC = &X86::VR64RegClass;
break;
case MVT::f32: case MVT::f64:
case MVT::v16i8: case MVT::v8i16: case MVT::v4i32: case MVT::v2i64:
case MVT::v4f32: case MVT::v2f64:
case MVT::v32i8: case MVT::v8i32: case MVT::v4i64: case MVT::v8f32:
case MVT::v4f64:
RRC = &X86::VR128RegClass;
break;
}
return std::make_pair(RRC, Cost);
}
bool X86TargetLowering::getStackCookieLocation(unsigned &AddressSpace,
unsigned &Offset) const {
if (!Subtarget->isTargetLinux())
return false;
if (Subtarget->is64Bit()) {
// %fs:0x28, unless we're using a Kernel code model, in which case it's %gs:
Offset = 0x28;
if (getTargetMachine().getCodeModel() == CodeModel::Kernel)
AddressSpace = 256;
else
AddressSpace = 257;
} else {
// %gs:0x14 on i386
Offset = 0x14;
AddressSpace = 256;
}
return true;
}
//===----------------------------------------------------------------------===//
// Return Value Calling Convention Implementation
//===----------------------------------------------------------------------===//
#include "X86GenCallingConv.inc"
bool
X86TargetLowering::CanLowerReturn(CallingConv::ID CallConv,
MachineFunction &MF, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const {
SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(),
RVLocs, Context);
return CCInfo.CheckReturn(Outs, RetCC_X86);
}
SDValue
X86TargetLowering::LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
DebugLoc dl, SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(),
RVLocs, *DAG.getContext());
CCInfo.AnalyzeReturn(Outs, RetCC_X86);
// Add the regs to the liveout set for the function.
MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
for (unsigned i = 0; i != RVLocs.size(); ++i)
if (RVLocs[i].isRegLoc() && !MRI.isLiveOut(RVLocs[i].getLocReg()))
MRI.addLiveOut(RVLocs[i].getLocReg());
SDValue Flag;
SmallVector<SDValue, 6> RetOps;
RetOps.push_back(Chain); // Operand #0 = Chain (updated below)
// Operand #1 = Bytes To Pop
RetOps.push_back(DAG.getTargetConstant(FuncInfo->getBytesToPopOnReturn(),
MVT::i16));
// Copy the result values into the output registers.
for (unsigned i = 0; i != RVLocs.size(); ++i) {
CCValAssign &VA = RVLocs[i];
assert(VA.isRegLoc() && "Can only return in registers!");
SDValue ValToCopy = OutVals[i];
EVT ValVT = ValToCopy.getValueType();
// If this is x86-64, and we disabled SSE, we can't return FP values,
// or SSE or MMX vectors.
if ((ValVT == MVT::f32 || ValVT == MVT::f64 ||
VA.getLocReg() == X86::XMM0 || VA.getLocReg() == X86::XMM1) &&
(Subtarget->is64Bit() && !Subtarget->hasSSE1())) {
report_fatal_error("SSE register return with SSE disabled");
}
// Likewise we can't return F64 values with SSE1 only. gcc does so, but
// llvm-gcc has never done it right and no one has noticed, so this
// should be OK for now.
if (ValVT == MVT::f64 &&
(Subtarget->is64Bit() && !Subtarget->hasSSE2()))
report_fatal_error("SSE2 register return with SSE2 disabled");
// Returns in ST0/ST1 are handled specially: these are pushed as operands to
// the RET instruction and handled by the FP Stackifier.
if (VA.getLocReg() == X86::ST0 ||
VA.getLocReg() == X86::ST1) {
// If this is a copy from an xmm register to ST(0), use an FPExtend to
// change the value to the FP stack register class.
if (isScalarFPTypeInSSEReg(VA.getValVT()))
ValToCopy = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f80, ValToCopy);
RetOps.push_back(ValToCopy);
// Don't emit a copytoreg.
continue;
}
// 64-bit vector (MMX) values are returned in XMM0 / XMM1 except for v1i64
// which is returned in RAX / RDX.
if (Subtarget->is64Bit()) {
if (ValVT == MVT::x86mmx) {
if (VA.getLocReg() == X86::XMM0 || VA.getLocReg() == X86::XMM1) {
ValToCopy = DAG.getNode(ISD::BITCAST, dl, MVT::i64, ValToCopy);
ValToCopy = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64,
ValToCopy);
// If we don't have SSE2 available, convert to v4f32 so the generated
// register is legal.
if (!Subtarget->hasSSE2())
ValToCopy = DAG.getNode(ISD::BITCAST, dl, MVT::v4f32,ValToCopy);
}
}
}
Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ValToCopy, Flag);
Flag = Chain.getValue(1);
}
// The x86-64 ABI for returning structs by value requires that we copy
// the sret argument into %rax for the return. We saved the argument into
// a virtual register in the entry block, so now we copy the value out
// and into %rax.
if (Subtarget->is64Bit() &&
DAG.getMachineFunction().getFunction()->hasStructRetAttr()) {
MachineFunction &MF = DAG.getMachineFunction();
X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
unsigned Reg = FuncInfo->getSRetReturnReg();
assert(Reg &&
"SRetReturnReg should have been set in LowerFormalArguments().");
SDValue Val = DAG.getCopyFromReg(Chain, dl, Reg, getPointerTy());
Chain = DAG.getCopyToReg(Chain, dl, X86::RAX, Val, Flag);
Flag = Chain.getValue(1);
// RAX now acts like a return value.
MRI.addLiveOut(X86::RAX);
}
RetOps[0] = Chain; // Update chain.
// Add the flag if we have it.
if (Flag.getNode())
RetOps.push_back(Flag);
return DAG.getNode(X86ISD::RET_FLAG, dl,
MVT::Other, &RetOps[0], RetOps.size());
}
bool X86TargetLowering::isUsedByReturnOnly(SDNode *N, SDValue &Chain) const {
if (N->getNumValues() != 1)
return false;
if (!N->hasNUsesOfValue(1, 0))
return false;
SDValue TCChain = Chain;
SDNode *Copy = *N->use_begin();
if (Copy->getOpcode() == ISD::CopyToReg) {
// If the copy has a glue operand, we conservatively assume it isn't safe to
// perform a tail call.
if (Copy->getOperand(Copy->getNumOperands()-1).getValueType() == MVT::Glue)
return false;
TCChain = Copy->getOperand(0);
} else if (Copy->getOpcode() != ISD::FP_EXTEND)
return false;
bool HasRet = false;
for (SDNode::use_iterator UI = Copy->use_begin(), UE = Copy->use_end();
UI != UE; ++UI) {
if (UI->getOpcode() != X86ISD::RET_FLAG)
return false;
HasRet = true;
}
if (!HasRet)
return false;
Chain = TCChain;
return true;
}
EVT
X86TargetLowering::getTypeForExtArgOrReturn(LLVMContext &Context, EVT VT,
ISD::NodeType ExtendKind) const {
MVT ReturnMVT;
// TODO: Is this also valid on 32-bit?
if (Subtarget->is64Bit() && VT == MVT::i1 && ExtendKind == ISD::ZERO_EXTEND)
ReturnMVT = MVT::i8;
else
ReturnMVT = MVT::i32;
EVT MinVT = getRegisterType(Context, ReturnMVT);
return VT.bitsLT(MinVT) ? MinVT : VT;
}
/// LowerCallResult - Lower the result values of a call into the
/// appropriate copies out of appropriate physical registers.
///
SDValue
X86TargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
// Assign locations to each value returned by this call.
SmallVector<CCValAssign, 16> RVLocs;
bool Is64Bit = Subtarget->is64Bit();
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), RVLocs, *DAG.getContext());
CCInfo.AnalyzeCallResult(Ins, RetCC_X86);
// Copy all of the result registers out of their specified physreg.
for (unsigned i = 0; i != RVLocs.size(); ++i) {
CCValAssign &VA = RVLocs[i];
EVT CopyVT = VA.getValVT();
// If this is x86-64, and we disabled SSE, we can't return FP values
if ((CopyVT == MVT::f32 || CopyVT == MVT::f64) &&
((Is64Bit || Ins[i].Flags.isInReg()) && !Subtarget->hasSSE1())) {
report_fatal_error("SSE register return with SSE disabled");
}
SDValue Val;
// If this is a call to a function that returns an fp value on the floating
// point stack, we must guarantee the the value is popped from the stack, so
// a CopyFromReg is not good enough - the copy instruction may be eliminated
// if the return value is not used. We use the FpPOP_RETVAL instruction
// instead.
if (VA.getLocReg() == X86::ST0 || VA.getLocReg() == X86::ST1) {
// If we prefer to use the value in xmm registers, copy it out as f80 and
// use a truncate to move it from fp stack reg to xmm reg.
if (isScalarFPTypeInSSEReg(VA.getValVT())) CopyVT = MVT::f80;
SDValue Ops[] = { Chain, InFlag };
Chain = SDValue(DAG.getMachineNode(X86::FpPOP_RETVAL, dl, CopyVT,
MVT::Other, MVT::Glue, Ops, 2), 1);
Val = Chain.getValue(0);
// Round the f80 to the right size, which also moves it to the appropriate
// xmm register.
if (CopyVT != VA.getValVT())
Val = DAG.getNode(ISD::FP_ROUND, dl, VA.getValVT(), Val,
// This truncation won't change the value.
DAG.getIntPtrConstant(1));
} else {
Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
CopyVT, InFlag).getValue(1);
Val = Chain.getValue(0);
}
InFlag = Chain.getValue(2);
InVals.push_back(Val);
}
return Chain;
}
//===----------------------------------------------------------------------===//
// C & StdCall & Fast Calling Convention implementation
//===----------------------------------------------------------------------===//
// StdCall calling convention seems to be standard for many Windows' API
// routines and around. It differs from C calling convention just a little:
// callee should clean up the stack, not caller. Symbols should be also
// decorated in some fancy way :) It doesn't support any vector arguments.
// For info on fast calling convention see Fast Calling Convention (tail call)
// implementation LowerX86_32FastCCCallTo.
/// CallIsStructReturn - Determines whether a call uses struct return
/// semantics.
static bool CallIsStructReturn(const SmallVectorImpl<ISD::OutputArg> &Outs) {
if (Outs.empty())
return false;
return Outs[0].Flags.isSRet();
}
/// ArgsAreStructReturn - Determines whether a function uses struct
/// return semantics.
static bool
ArgsAreStructReturn(const SmallVectorImpl<ISD::InputArg> &Ins) {
if (Ins.empty())
return false;
return Ins[0].Flags.isSRet();
}
/// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
/// by "Src" to address "Dst" with size and alignment information specified by
/// the specific parameter attribute. The copy will be passed as a byval
/// function parameter.
static SDValue
CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
DebugLoc dl) {
SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
/*isVolatile*/false, /*AlwaysInline=*/true,
MachinePointerInfo(), MachinePointerInfo());
}
/// IsTailCallConvention - Return true if the calling convention is one that
/// supports tail call optimization.
static bool IsTailCallConvention(CallingConv::ID CC) {
return (CC == CallingConv::Fast || CC == CallingConv::GHC);
}
bool X86TargetLowering::mayBeEmittedAsTailCall(CallInst *CI) const {
if (!CI->isTailCall() || getTargetMachine().Options.DisableTailCalls)
return false;
CallSite CS(CI);
CallingConv::ID CalleeCC = CS.getCallingConv();
if (!IsTailCallConvention(CalleeCC) && CalleeCC != CallingConv::C)
return false;
return true;
}
/// FuncIsMadeTailCallSafe - Return true if the function is being made into
/// a tailcall target by changing its ABI.
static bool FuncIsMadeTailCallSafe(CallingConv::ID CC,
bool GuaranteedTailCallOpt) {
return GuaranteedTailCallOpt && IsTailCallConvention(CC);
}
SDValue
X86TargetLowering::LowerMemArgument(SDValue Chain,
CallingConv::ID CallConv,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
const CCValAssign &VA,
MachineFrameInfo *MFI,
unsigned i) const {
// Create the nodes corresponding to a load from this parameter slot.
ISD::ArgFlagsTy Flags = Ins[i].Flags;
bool AlwaysUseMutable = FuncIsMadeTailCallSafe(CallConv,
getTargetMachine().Options.GuaranteedTailCallOpt);
bool isImmutable = !AlwaysUseMutable && !Flags.isByVal();
EVT ValVT;
// If value is passed by pointer we have address passed instead of the value
// itself.
if (VA.getLocInfo() == CCValAssign::Indirect)
ValVT = VA.getLocVT();
else
ValVT = VA.getValVT();
// FIXME: For now, all byval parameter objects are marked mutable. This can be
// changed with more analysis.
// In case of tail call optimization mark all arguments mutable. Since they
// could be overwritten by lowering of arguments in case of a tail call.
if (Flags.isByVal()) {
unsigned Bytes = Flags.getByValSize();
if (Bytes == 0) Bytes = 1; // Don't create zero-sized stack objects.
int FI = MFI->CreateFixedObject(Bytes, VA.getLocMemOffset(), isImmutable);
return DAG.getFrameIndex(FI, getPointerTy());
} else {
int FI = MFI->CreateFixedObject(ValVT.getSizeInBits()/8,
VA.getLocMemOffset(), isImmutable);
SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
return DAG.getLoad(ValVT, dl, Chain, FIN,
MachinePointerInfo::getFixedStack(FI),
false, false, false, 0);
}
}
SDValue
X86TargetLowering::LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl,
SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals)
const {
MachineFunction &MF = DAG.getMachineFunction();
X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
const Function* Fn = MF.getFunction();
if (Fn->hasExternalLinkage() &&
Subtarget->isTargetCygMing() &&
Fn->getName() == "main")
FuncInfo->setForceFramePointer(true);
MachineFrameInfo *MFI = MF.getFrameInfo();
bool Is64Bit = Subtarget->is64Bit();
bool IsWindows = Subtarget->isTargetWindows();
bool IsWin64 = Subtarget->isTargetWin64();
assert(!(isVarArg && IsTailCallConvention(CallConv)) &&
"Var args not supported with calling convention fastcc or ghc");
// Assign locations to all of the incoming arguments.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(),
ArgLocs, *DAG.getContext());
// Allocate shadow area for Win64
if (IsWin64) {
CCInfo.AllocateStack(32, 8);
}
CCInfo.AnalyzeFormalArguments(Ins, CC_X86);
unsigned LastVal = ~0U;
SDValue ArgValue;
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
// TODO: If an arg is passed in two places (e.g. reg and stack), skip later
// places.
assert(VA.getValNo() != LastVal &&
"Don't support value assigned to multiple locs yet");
(void)LastVal;
LastVal = VA.getValNo();
if (VA.isRegLoc()) {
EVT RegVT = VA.getLocVT();
const TargetRegisterClass *RC;
if (RegVT == MVT::i32)
RC = &X86::GR32RegClass;
else if (Is64Bit && RegVT == MVT::i64)
RC = &X86::GR64RegClass;
else if (RegVT == MVT::f32)
RC = &X86::FR32RegClass;
else if (RegVT == MVT::f64)
RC = &X86::FR64RegClass;
else if (RegVT.isVector() && RegVT.getSizeInBits() == 256)
RC = &X86::VR256RegClass;
else if (RegVT.isVector() && RegVT.getSizeInBits() == 128)
RC = &X86::VR128RegClass;
else if (RegVT == MVT::x86mmx)
RC = &X86::VR64RegClass;
else
llvm_unreachable("Unknown argument type!");
unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
// If this is an 8 or 16-bit value, it is really passed promoted to 32
// bits. Insert an assert[sz]ext to capture this, then truncate to the
// right size.
if (VA.getLocInfo() == CCValAssign::SExt)
ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
DAG.getValueType(VA.getValVT()));
else if (VA.getLocInfo() == CCValAssign::ZExt)
ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
DAG.getValueType(VA.getValVT()));
else if (VA.getLocInfo() == CCValAssign::BCvt)
ArgValue = DAG.getNode(ISD::BITCAST, dl, VA.getValVT(), ArgValue);
if (VA.isExtInLoc()) {
// Handle MMX values passed in XMM regs.
if (RegVT.isVector()) {
ArgValue = DAG.getNode(X86ISD::MOVDQ2Q, dl, VA.getValVT(),
ArgValue);
} else
ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
}
} else {
assert(VA.isMemLoc());
ArgValue = LowerMemArgument(Chain, CallConv, Ins, dl, DAG, VA, MFI, i);
}
// If value is passed via pointer - do a load.
if (VA.getLocInfo() == CCValAssign::Indirect)
ArgValue = DAG.getLoad(VA.getValVT(), dl, Chain, ArgValue,
MachinePointerInfo(), false, false, false, 0);
InVals.push_back(ArgValue);
}
// The x86-64 ABI for returning structs by value requires that we copy
// the sret argument into %rax for the return. Save the argument into
// a virtual register so that we can access it from the return points.
if (Is64Bit && MF.getFunction()->hasStructRetAttr()) {
X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
unsigned Reg = FuncInfo->getSRetReturnReg();
if (!Reg) {
Reg = MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::i64));
FuncInfo->setSRetReturnReg(Reg);
}
SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[0]);
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain);
}
unsigned StackSize = CCInfo.getNextStackOffset();
// Align stack specially for tail calls.
if (FuncIsMadeTailCallSafe(CallConv,
MF.getTarget().Options.GuaranteedTailCallOpt))
StackSize = GetAlignedArgumentStackSize(StackSize, DAG);
// If the function takes variable number of arguments, make a frame index for
// the start of the first vararg value... for expansion of llvm.va_start.
if (isVarArg) {
if (Is64Bit || (CallConv != CallingConv::X86_FastCall &&
CallConv != CallingConv::X86_ThisCall)) {
FuncInfo->setVarArgsFrameIndex(MFI->CreateFixedObject(1, StackSize,true));
}
if (Is64Bit) {
unsigned TotalNumIntRegs = 0, TotalNumXMMRegs = 0;
// FIXME: We should really autogenerate these arrays
static const uint16_t GPR64ArgRegsWin64[] = {
X86::RCX, X86::RDX, X86::R8, X86::R9
};
static const uint16_t GPR64ArgRegs64Bit[] = {
X86::RDI, X86::RSI, X86::RDX, X86::RCX, X86::R8, X86::R9
};
static const uint16_t XMMArgRegs64Bit[] = {
X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
};
const uint16_t *GPR64ArgRegs;
unsigned NumXMMRegs = 0;
if (IsWin64) {
// The XMM registers which might contain var arg parameters are shadowed
// in their paired GPR. So we only need to save the GPR to their home
// slots.
TotalNumIntRegs = 4;
GPR64ArgRegs = GPR64ArgRegsWin64;
} else {
TotalNumIntRegs = 6; TotalNumXMMRegs = 8;
GPR64ArgRegs = GPR64ArgRegs64Bit;
NumXMMRegs = CCInfo.getFirstUnallocated(XMMArgRegs64Bit,
TotalNumXMMRegs);
}
unsigned NumIntRegs = CCInfo.getFirstUnallocated(GPR64ArgRegs,
TotalNumIntRegs);
bool NoImplicitFloatOps = Fn->hasFnAttr(Attribute::NoImplicitFloat);
assert(!(NumXMMRegs && !Subtarget->hasSSE1()) &&
"SSE register cannot be used when SSE is disabled!");
assert(!(NumXMMRegs && MF.getTarget().Options.UseSoftFloat &&
NoImplicitFloatOps) &&
"SSE register cannot be used when SSE is disabled!");
if (MF.getTarget().Options.UseSoftFloat || NoImplicitFloatOps ||
!Subtarget->hasSSE1())
// Kernel mode asks for SSE to be disabled, so don't push them
// on the stack.
TotalNumXMMRegs = 0;
if (IsWin64) {
const TargetFrameLowering &TFI = *getTargetMachine().getFrameLowering();
// Get to the caller-allocated home save location. Add 8 to account
// for the return address.
int HomeOffset = TFI.getOffsetOfLocalArea() + 8;
FuncInfo->setRegSaveFrameIndex(
MFI->CreateFixedObject(1, NumIntRegs * 8 + HomeOffset, false));
// Fixup to set vararg frame on shadow area (4 x i64).
if (NumIntRegs < 4)
FuncInfo->setVarArgsFrameIndex(FuncInfo->getRegSaveFrameIndex());
} else {
// For X86-64, if there are vararg parameters that are passed via
// registers, then we must store them to their spots on the stack so
// they may be loaded by deferencing the result of va_next.
FuncInfo->setVarArgsGPOffset(NumIntRegs * 8);
FuncInfo->setVarArgsFPOffset(TotalNumIntRegs * 8 + NumXMMRegs * 16);
FuncInfo->setRegSaveFrameIndex(
MFI->CreateStackObject(TotalNumIntRegs * 8 + TotalNumXMMRegs * 16, 16,
false));
}
// Store the integer parameter registers.
SmallVector<SDValue, 8> MemOps;
SDValue RSFIN = DAG.getFrameIndex(FuncInfo->getRegSaveFrameIndex(),
getPointerTy());
unsigned Offset = FuncInfo->getVarArgsGPOffset();
for (; NumIntRegs != TotalNumIntRegs; ++NumIntRegs) {
SDValue FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), RSFIN,
DAG.getIntPtrConstant(Offset));
unsigned VReg = MF.addLiveIn(GPR64ArgRegs[NumIntRegs],
&X86::GR64RegClass);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i64);
SDValue Store =
DAG.getStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo::getFixedStack(
FuncInfo->getRegSaveFrameIndex(), Offset),
false, false, 0);
MemOps.push_back(Store);
Offset += 8;
}
if (TotalNumXMMRegs != 0 && NumXMMRegs != TotalNumXMMRegs) {
// Now store the XMM (fp + vector) parameter registers.
SmallVector<SDValue, 11> SaveXMMOps;
SaveXMMOps.push_back(Chain);
unsigned AL = MF.addLiveIn(X86::AL, &X86::GR8RegClass);
SDValue ALVal = DAG.getCopyFromReg(DAG.getEntryNode(), dl, AL, MVT::i8);
SaveXMMOps.push_back(ALVal);
SaveXMMOps.push_back(DAG.getIntPtrConstant(
FuncInfo->getRegSaveFrameIndex()));
SaveXMMOps.push_back(DAG.getIntPtrConstant(
FuncInfo->getVarArgsFPOffset()));
for (; NumXMMRegs != TotalNumXMMRegs; ++NumXMMRegs) {
unsigned VReg = MF.addLiveIn(XMMArgRegs64Bit[NumXMMRegs],
&X86::VR128RegClass);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::v4f32);
SaveXMMOps.push_back(Val);
}
MemOps.push_back(DAG.getNode(X86ISD::VASTART_SAVE_XMM_REGS, dl,
MVT::Other,
&SaveXMMOps[0], SaveXMMOps.size()));
}
if (!MemOps.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOps[0], MemOps.size());
}
}
// Some CCs need callee pop.
if (X86::isCalleePop(CallConv, Is64Bit, isVarArg,
MF.getTarget().Options.GuaranteedTailCallOpt)) {
FuncInfo->setBytesToPopOnReturn(StackSize); // Callee pops everything.
} else {
FuncInfo->setBytesToPopOnReturn(0); // Callee pops nothing.
// If this is an sret function, the return should pop the hidden pointer.
if (!Is64Bit && !IsTailCallConvention(CallConv) && !IsWindows &&
ArgsAreStructReturn(Ins))
FuncInfo->setBytesToPopOnReturn(4);
}
if (!Is64Bit) {
// RegSaveFrameIndex is X86-64 only.
FuncInfo->setRegSaveFrameIndex(0xAAAAAAA);
if (CallConv == CallingConv::X86_FastCall ||
CallConv == CallingConv::X86_ThisCall)
// fastcc functions can't have varargs.
FuncInfo->setVarArgsFrameIndex(0xAAAAAAA);
}
FuncInfo->setArgumentStackSize(StackSize);
return Chain;
}
SDValue
X86TargetLowering::LowerMemOpCallTo(SDValue Chain,
SDValue StackPtr, SDValue Arg,
DebugLoc dl, SelectionDAG &DAG,
const CCValAssign &VA,
ISD::ArgFlagsTy Flags) const {
unsigned LocMemOffset = VA.getLocMemOffset();
SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
if (Flags.isByVal())
return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG, dl);
return DAG.getStore(Chain, dl, Arg, PtrOff,
MachinePointerInfo::getStack(LocMemOffset),
false, false, 0);
}
/// EmitTailCallLoadRetAddr - Emit a load of return address if tail call
/// optimization is performed and it is required.
SDValue
X86TargetLowering::EmitTailCallLoadRetAddr(SelectionDAG &DAG,
SDValue &OutRetAddr, SDValue Chain,
bool IsTailCall, bool Is64Bit,
int FPDiff, DebugLoc dl) const {
// Adjust the Return address stack slot.
EVT VT = getPointerTy();
OutRetAddr = getReturnAddressFrameIndex(DAG);
// Load the "old" Return address.
OutRetAddr = DAG.getLoad(VT, dl, Chain, OutRetAddr, MachinePointerInfo(),
false, false, false, 0);
return SDValue(OutRetAddr.getNode(), 1);
}
/// EmitTailCallStoreRetAddr - Emit a store of the return address if tail call
/// optimization is performed and it is required (FPDiff!=0).
static SDValue
EmitTailCallStoreRetAddr(SelectionDAG & DAG, MachineFunction &MF,
SDValue Chain, SDValue RetAddrFrIdx,
bool Is64Bit, int FPDiff, DebugLoc dl) {
// Store the return address to the appropriate stack slot.
if (!FPDiff) return Chain;
// Calculate the new stack slot for the return address.
int SlotSize = Is64Bit ? 8 : 4;
int NewReturnAddrFI =
MF.getFrameInfo()->CreateFixedObject(SlotSize, FPDiff-SlotSize, false);
EVT VT = Is64Bit ? MVT::i64 : MVT::i32;
SDValue NewRetAddrFrIdx = DAG.getFrameIndex(NewReturnAddrFI, VT);
Chain = DAG.getStore(Chain, dl, RetAddrFrIdx, NewRetAddrFrIdx,
MachinePointerInfo::getFixedStack(NewReturnAddrFI),
false, false, 0);
return Chain;
}
SDValue
X86TargetLowering::LowerCall(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool doesNotRet, bool &isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
MachineFunction &MF = DAG.getMachineFunction();
bool Is64Bit = Subtarget->is64Bit();
bool IsWin64 = Subtarget->isTargetWin64();
bool IsWindows = Subtarget->isTargetWindows();
bool IsStructRet = CallIsStructReturn(Outs);
bool IsSibcall = false;
if (MF.getTarget().Options.DisableTailCalls)
isTailCall = false;
if (isTailCall) {
// Check if it's really possible to do a tail call.
isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
isVarArg, IsStructRet, MF.getFunction()->hasStructRetAttr(),
Outs, OutVals, Ins, DAG);
// Sibcalls are automatically detected tailcalls which do not require
// ABI changes.
if (!MF.getTarget().Options.GuaranteedTailCallOpt && isTailCall)
IsSibcall = true;
if (isTailCall)
++NumTailCalls;
}
assert(!(isVarArg && IsTailCallConvention(CallConv)) &&
"Var args not supported with calling convention fastcc or ghc");
// Analyze operands of the call, assigning locations to each operand.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(),
ArgLocs, *DAG.getContext());
// Allocate shadow area for Win64
if (IsWin64) {
CCInfo.AllocateStack(32, 8);
}
CCInfo.AnalyzeCallOperands(Outs, CC_X86);
// Get a count of how many bytes are to be pushed on the stack.
unsigned NumBytes = CCInfo.getNextStackOffset();
if (IsSibcall)
// This is a sibcall. The memory operands are available in caller's
// own caller's stack.
NumBytes = 0;
else if (getTargetMachine().Options.GuaranteedTailCallOpt &&
IsTailCallConvention(CallConv))
NumBytes = GetAlignedArgumentStackSize(NumBytes, DAG);
int FPDiff = 0;
if (isTailCall && !IsSibcall) {
// Lower arguments at fp - stackoffset + fpdiff.
unsigned NumBytesCallerPushed =
MF.getInfo<X86MachineFunctionInfo>()->getBytesToPopOnReturn();
FPDiff = NumBytesCallerPushed - NumBytes;
// Set the delta of movement of the returnaddr stackslot.
// But only set if delta is greater than previous delta.
if (FPDiff < (MF.getInfo<X86MachineFunctionInfo>()->getTCReturnAddrDelta()))
MF.getInfo<X86MachineFunctionInfo>()->setTCReturnAddrDelta(FPDiff);
}
if (!IsSibcall)
Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
SDValue RetAddrFrIdx;
// Load return address for tail calls.
if (isTailCall && FPDiff)
Chain = EmitTailCallLoadRetAddr(DAG, RetAddrFrIdx, Chain, isTailCall,
Is64Bit, FPDiff, dl);
SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
SmallVector<SDValue, 8> MemOpChains;
SDValue StackPtr;
// Walk the register/memloc assignments, inserting copies/loads. In the case
// of tail call optimization arguments are handle later.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
EVT RegVT = VA.getLocVT();
SDValue Arg = OutVals[i];
ISD::ArgFlagsTy Flags = Outs[i].Flags;
bool isByVal = Flags.isByVal();
// Promote the value if needed.
switch (VA.getLocInfo()) {
default: llvm_unreachable("Unknown loc info!");
case CCValAssign::Full: break;
case CCValAssign::SExt:
Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, RegVT, Arg);
break;
case CCValAssign::ZExt:
Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, RegVT, Arg);
break;
case CCValAssign::AExt:
if (RegVT.isVector() && RegVT.getSizeInBits() == 128) {
// Special case: passing MMX values in XMM registers.
Arg = DAG.getNode(ISD::BITCAST, dl, MVT::i64, Arg);
Arg = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64, Arg);
Arg = getMOVL(DAG, dl, MVT::v2i64, DAG.getUNDEF(MVT::v2i64), Arg);
} else
Arg = DAG.getNode(ISD::ANY_EXTEND, dl, RegVT, Arg);
break;
case CCValAssign::BCvt:
Arg = DAG.getNode(ISD::BITCAST, dl, RegVT, Arg);
break;
case CCValAssign::Indirect: {
// Store the argument.
SDValue SpillSlot = DAG.CreateStackTemporary(VA.getValVT());
int FI = cast<FrameIndexSDNode>(SpillSlot)->getIndex();
Chain = DAG.getStore(Chain, dl, Arg, SpillSlot,
MachinePointerInfo::getFixedStack(FI),
false, false, 0);
Arg = SpillSlot;
break;
}
}
if (VA.isRegLoc()) {
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
if (isVarArg && IsWin64) {
// Win64 ABI requires argument XMM reg to be copied to the corresponding
// shadow reg if callee is a varargs function.
unsigned ShadowReg = 0;
switch (VA.getLocReg()) {
case X86::XMM0: ShadowReg = X86::RCX; break;
case X86::XMM1: ShadowReg = X86::RDX; break;
case X86::XMM2: ShadowReg = X86::R8; break;
case X86::XMM3: ShadowReg = X86::R9; break;
}
if (ShadowReg)
RegsToPass.push_back(std::make_pair(ShadowReg, Arg));
}
} else if (!IsSibcall && (!isTailCall || isByVal)) {
assert(VA.isMemLoc());
if (StackPtr.getNode() == 0)
StackPtr = DAG.getCopyFromReg(Chain, dl, X86StackPtr, getPointerTy());
MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Arg,
dl, DAG, VA, Flags));
}
}
if (!MemOpChains.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOpChains[0], MemOpChains.size());
// Build a sequence of copy-to-reg nodes chained together with token chain
// and flag operands which copy the outgoing args into registers.
SDValue InFlag;
// Tail call byval lowering might overwrite argument registers so in case of
// tail call optimization the copies to registers are lowered later.
if (!isTailCall)
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
RegsToPass[i].second, InFlag);
InFlag = Chain.getValue(1);
}
if (Subtarget->isPICStyleGOT()) {
// ELF / PIC requires GOT in the EBX register before function calls via PLT
// GOT pointer.
if (!isTailCall) {
Chain = DAG.getCopyToReg(Chain, dl, X86::EBX,
DAG.getNode(X86ISD::GlobalBaseReg,
DebugLoc(), getPointerTy()),
InFlag);
InFlag = Chain.getValue(1);
} else {
// If we are tail calling and generating PIC/GOT style code load the
// address of the callee into ECX. The value in ecx is used as target of
// the tail jump. This is done to circumvent the ebx/callee-saved problem
// for tail calls on PIC/GOT architectures. Normally we would just put the
// address of GOT into ebx and then call target@PLT. But for tail calls
// ebx would be restored (since ebx is callee saved) before jumping to the
// target@PLT.
// Note: The actual moving to ECX is done further down.
GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee);
if (G && !G->getGlobal()->hasHiddenVisibility() &&
!G->getGlobal()->hasProtectedVisibility())
Callee = LowerGlobalAddress(Callee, DAG);
else if (isa<ExternalSymbolSDNode>(Callee))
Callee = LowerExternalSymbol(Callee, DAG);
}
}
if (Is64Bit && isVarArg && !IsWin64) {
// From AMD64 ABI document:
// For calls that may call functions that use varargs or stdargs
// (prototype-less calls or calls to functions containing ellipsis (...) in
// the declaration) %al is used as hidden argument to specify the number
// of SSE registers used. The contents of %al do not need to match exactly
// the number of registers, but must be an ubound on the number of SSE
// registers used and is in the range 0 - 8 inclusive.
// Count the number of XMM registers allocated.
static const uint16_t XMMArgRegs[] = {
X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
};
unsigned NumXMMRegs = CCInfo.getFirstUnallocated(XMMArgRegs, 8);
assert((Subtarget->hasSSE1() || !NumXMMRegs)
&& "SSE registers cannot be used when SSE is disabled");
Chain = DAG.getCopyToReg(Chain, dl, X86::AL,
DAG.getConstant(NumXMMRegs, MVT::i8), InFlag);
InFlag = Chain.getValue(1);
}
// For tail calls lower the arguments to the 'real' stack slot.
if (isTailCall) {
// Force all the incoming stack arguments to be loaded from the stack
// before any new outgoing arguments are stored to the stack, because the
// outgoing stack slots may alias the incoming argument stack slots, and
// the alias isn't otherwise explicit. This is slightly more conservative
// than necessary, because it means that each store effectively depends
// on every argument instead of just those arguments it would clobber.
SDValue ArgChain = DAG.getStackArgumentTokenFactor(Chain);
SmallVector<SDValue, 8> MemOpChains2;
SDValue FIN;
int FI = 0;
// Do not flag preceding copytoreg stuff together with the following stuff.
InFlag = SDValue();
if (getTargetMachine().Options.GuaranteedTailCallOpt) {
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
if (VA.isRegLoc())
continue;
assert(VA.isMemLoc());
SDValue Arg = OutVals[i];
ISD::ArgFlagsTy Flags = Outs[i].Flags;
// Create frame index.
int32_t Offset = VA.getLocMemOffset()+FPDiff;
uint32_t OpSize = (VA.getLocVT().getSizeInBits()+7)/8;
FI = MF.getFrameInfo()->CreateFixedObject(OpSize, Offset, true);
FIN = DAG.getFrameIndex(FI, getPointerTy());
if (Flags.isByVal()) {
// Copy relative to framepointer.
SDValue Source = DAG.getIntPtrConstant(VA.getLocMemOffset());
if (StackPtr.getNode() == 0)
StackPtr = DAG.getCopyFromReg(Chain, dl, X86StackPtr,
getPointerTy());
Source = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, Source);
MemOpChains2.push_back(CreateCopyOfByValArgument(Source, FIN,
ArgChain,
Flags, DAG, dl));
} else {
// Store relative to framepointer.
MemOpChains2.push_back(
DAG.getStore(ArgChain, dl, Arg, FIN,
MachinePointerInfo::getFixedStack(FI),
false, false, 0));
}
}
}
if (!MemOpChains2.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOpChains2[0], MemOpChains2.size());
// Copy arguments to their registers.
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
RegsToPass[i].second, InFlag);
InFlag = Chain.getValue(1);
}
InFlag =SDValue();
// Store the return address to the appropriate stack slot.
Chain = EmitTailCallStoreRetAddr(DAG, MF, Chain, RetAddrFrIdx, Is64Bit,
FPDiff, dl);
}
if (getTargetMachine().getCodeModel() == CodeModel::Large) {
assert(Is64Bit && "Large code model is only legal in 64-bit mode.");
// In the 64-bit large code model, we have to make all calls
// through a register, since the call instruction's 32-bit
// pc-relative offset may not be large enough to hold the whole
// address.
} else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
// If the callee is a GlobalAddress node (quite common, every direct call
// is) turn it into a TargetGlobalAddress node so that legalize doesn't hack
// it.
// We should use extra load for direct calls to dllimported functions in
// non-JIT mode.
const GlobalValue *GV = G->getGlobal();
if (!GV->hasDLLImportLinkage()) {
unsigned char OpFlags = 0;
bool ExtraLoad = false;
unsigned WrapperKind = ISD::DELETED_NODE;
// On ELF targets, in both X86-64 and X86-32 mode, direct calls to
// external symbols most go through the PLT in PIC mode. If the symbol
// has hidden or protected visibility, or if it is static or local, then
// we don't need to use the PLT - we can directly call it.
if (Subtarget->isTargetELF() &&
getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
GV->hasDefaultVisibility() && !GV->hasLocalLinkage()) {
OpFlags = X86II::MO_PLT;
} else if (Subtarget->isPICStyleStubAny() &&
(GV->isDeclaration() || GV->isWeakForLinker()) &&
(!Subtarget->getTargetTriple().isMacOSX() ||
Subtarget->getTargetTriple().isMacOSXVersionLT(10, 5))) {
// PC-relative references to external symbols should go through $stub,
// unless we're building with the leopard linker or later, which
// automatically synthesizes these stubs.
OpFlags = X86II::MO_DARWIN_STUB;
} else if (Subtarget->isPICStyleRIPRel() &&
isa<Function>(GV) &&
cast<Function>(GV)->hasFnAttr(Attribute::NonLazyBind)) {
// If the function is marked as non-lazy, generate an indirect call
// which loads from the GOT directly. This avoids runtime overhead
// at the cost of eager binding (and one extra byte of encoding).
OpFlags = X86II::MO_GOTPCREL;
WrapperKind = X86ISD::WrapperRIP;
ExtraLoad = true;
}
Callee = DAG.getTargetGlobalAddress(GV, dl, getPointerTy(),
G->getOffset(), OpFlags);
// Add a wrapper if needed.
if (WrapperKind != ISD::DELETED_NODE)
Callee = DAG.getNode(X86ISD::WrapperRIP, dl, getPointerTy(), Callee);
// Add extra indirection if needed.
if (ExtraLoad)
Callee = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), Callee,
MachinePointerInfo::getGOT(),
false, false, false, 0);
}
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
unsigned char OpFlags = 0;
// On ELF targets, in either X86-64 or X86-32 mode, direct calls to
// external symbols should go through the PLT.
if (Subtarget->isTargetELF() &&
getTargetMachine().getRelocationModel() == Reloc::PIC_) {
OpFlags = X86II::MO_PLT;
} else if (Subtarget->isPICStyleStubAny() &&
(!Subtarget->getTargetTriple().isMacOSX() ||
Subtarget->getTargetTriple().isMacOSXVersionLT(10, 5))) {
// PC-relative references to external symbols should go through $stub,
// unless we're building with the leopard linker or later, which
// automatically synthesizes these stubs.
OpFlags = X86II::MO_DARWIN_STUB;
}
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy(),
OpFlags);
}
// Returns a chain & a flag for retval copy to use.
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
SmallVector<SDValue, 8> Ops;
if (!IsSibcall && isTailCall) {
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
DAG.getIntPtrConstant(0, true), InFlag);
InFlag = Chain.getValue(1);
}
Ops.push_back(Chain);
Ops.push_back(Callee);
if (isTailCall)
Ops.push_back(DAG.getConstant(FPDiff, MVT::i32));
// Add argument registers to the end of the list so that they are known live
// into the call.
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
Ops.push_back(DAG.getRegister(RegsToPass[i].first,
RegsToPass[i].second.getValueType()));
// Add an implicit use GOT pointer in EBX.
if (!isTailCall && Subtarget->isPICStyleGOT())
Ops.push_back(DAG.getRegister(X86::EBX, getPointerTy()));
// Add an implicit use of AL for non-Windows x86 64-bit vararg functions.
if (Is64Bit && isVarArg && !IsWin64)
Ops.push_back(DAG.getRegister(X86::AL, MVT::i8));
// Add a register mask operand representing the call-preserved registers.
const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
const uint32_t *Mask = TRI->getCallPreservedMask(CallConv);
assert(Mask && "Missing call preserved mask for calling convention");
Ops.push_back(DAG.getRegisterMask(Mask));
if (InFlag.getNode())
Ops.push_back(InFlag);
if (isTailCall) {
// We used to do:
//// If this is the first return lowered for this function, add the regs
//// to the liveout set for the function.
// This isn't right, although it's probably harmless on x86; liveouts
// should be computed from returns not tail calls. Consider a void
// function making a tail call to a function returning int.
return DAG.getNode(X86ISD::TC_RETURN, dl,
NodeTys, &Ops[0], Ops.size());
}
Chain = DAG.getNode(X86ISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
InFlag = Chain.getValue(1);
// Create the CALLSEQ_END node.
unsigned NumBytesForCalleeToPush;
if (X86::isCalleePop(CallConv, Is64Bit, isVarArg,
getTargetMachine().Options.GuaranteedTailCallOpt))
NumBytesForCalleeToPush = NumBytes; // Callee pops everything
else if (!Is64Bit && !IsTailCallConvention(CallConv) && !IsWindows &&
IsStructRet)
// If this is a call to a struct-return function, the callee
// pops the hidden struct pointer, so we have to push it back.
// This is common for Darwin/X86, Linux & Mingw32 targets.
// For MSVC Win32 targets, the caller pops the hidden struct pointer.
NumBytesForCalleeToPush = 4;
else
NumBytesForCalleeToPush = 0; // Callee pops nothing.
// Returns a flag for retval copy to use.
if (!IsSibcall) {
Chain = DAG.getCALLSEQ_END(Chain,
DAG.getIntPtrConstant(NumBytes, true),
DAG.getIntPtrConstant(NumBytesForCalleeToPush,
true),
InFlag);
InFlag = Chain.getValue(1);
}
// Handle result values, copying them out of physregs into vregs that we
// return.
return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
Ins, dl, DAG, InVals);
}
//===----------------------------------------------------------------------===//
// Fast Calling Convention (tail call) implementation
//===----------------------------------------------------------------------===//
// Like std call, callee cleans arguments, convention except that ECX is
// reserved for storing the tail called function address. Only 2 registers are
// free for argument passing (inreg). Tail call optimization is performed
// provided:
// * tailcallopt is enabled
// * caller/callee are fastcc
// On X86_64 architecture with GOT-style position independent code only local
// (within module) calls are supported at the moment.
// To keep the stack aligned according to platform abi the function
// GetAlignedArgumentStackSize ensures that argument delta is always multiples
// of stack alignment. (Dynamic linkers need this - darwin's dyld for example)
// If a tail called function callee has more arguments than the caller the
// caller needs to make sure that there is room to move the RETADDR to. This is
// achieved by reserving an area the size of the argument delta right after the
// original REtADDR, but before the saved framepointer or the spilled registers
// e.g. caller(arg1, arg2) calls callee(arg1, arg2,arg3,arg4)
// stack layout:
// arg1
// arg2
// RETADDR
// [ new RETADDR
// move area ]
// (possible EBP)
// ESI
// EDI
// local1 ..
/// GetAlignedArgumentStackSize - Make the stack size align e.g 16n + 12 aligned
/// for a 16 byte align requirement.
unsigned
X86TargetLowering::GetAlignedArgumentStackSize(unsigned StackSize,
SelectionDAG& DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
const TargetMachine &TM = MF.getTarget();
const TargetFrameLowering &TFI = *TM.getFrameLowering();
unsigned StackAlignment = TFI.getStackAlignment();
uint64_t AlignMask = StackAlignment - 1;
int64_t Offset = StackSize;
uint64_t SlotSize = TD->getPointerSize();
if ( (Offset & AlignMask) <= (StackAlignment - SlotSize) ) {
// Number smaller than 12 so just add the difference.
Offset += ((StackAlignment - SlotSize) - (Offset & AlignMask));
} else {
// Mask out lower bits, add stackalignment once plus the 12 bytes.
Offset = ((~AlignMask) & Offset) + StackAlignment +
(StackAlignment-SlotSize);
}
return Offset;
}
/// MatchingStackOffset - Return true if the given stack call argument is
/// already available in the same position (relatively) of the caller's
/// incoming argument stack.
static
bool MatchingStackOffset(SDValue Arg, unsigned Offset, ISD::ArgFlagsTy Flags,
MachineFrameInfo *MFI, const MachineRegisterInfo *MRI,
const X86InstrInfo *TII) {
unsigned Bytes = Arg.getValueType().getSizeInBits() / 8;
int FI = INT_MAX;
if (Arg.getOpcode() == ISD::CopyFromReg) {
unsigned VR = cast<RegisterSDNode>(Arg.getOperand(1))->getReg();
if (!TargetRegisterInfo::isVirtualRegister(VR))
return false;
MachineInstr *Def = MRI->getVRegDef(VR);
if (!Def)
return false;
if (!Flags.isByVal()) {
if (!TII->isLoadFromStackSlot(Def, FI))
return false;
} else {
unsigned Opcode = Def->getOpcode();
if ((Opcode == X86::LEA32r || Opcode == X86::LEA64r) &&
Def->getOperand(1).isFI()) {
FI = Def->getOperand(1).getIndex();
Bytes = Flags.getByValSize();
} else
return false;
}
} else if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Arg)) {
if (Flags.isByVal())
// ByVal argument is passed in as a pointer but it's now being
// dereferenced. e.g.
// define @foo(%struct.X* %A) {
// tail call @bar(%struct.X* byval %A)
// }
return false;
SDValue Ptr = Ld->getBasePtr();
FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr);
if (!FINode)
return false;
FI = FINode->getIndex();
} else if (Arg.getOpcode() == ISD::FrameIndex && Flags.isByVal()) {
FrameIndexSDNode *FINode = cast<FrameIndexSDNode>(Arg);
FI = FINode->getIndex();
Bytes = Flags.getByValSize();
} else
return false;
assert(FI != INT_MAX);
if (!MFI->isFixedObjectIndex(FI))
return false;
return Offset == MFI->getObjectOffset(FI) && Bytes == MFI->getObjectSize(FI);
}
/// IsEligibleForTailCallOptimization - Check whether the call is eligible
/// for tail call optimization. Targets which want to do tail call
/// optimization should implement this function.
bool
X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
CallingConv::ID CalleeCC,
bool isVarArg,
bool isCalleeStructRet,
bool isCallerStructRet,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
SelectionDAG& DAG) const {
if (!IsTailCallConvention(CalleeCC) &&
CalleeCC != CallingConv::C)
return false;
// If -tailcallopt is specified, make fastcc functions tail-callable.
const MachineFunction &MF = DAG.getMachineFunction();
const Function *CallerF = DAG.getMachineFunction().getFunction();
CallingConv::ID CallerCC = CallerF->getCallingConv();
bool CCMatch = CallerCC == CalleeCC;
if (getTargetMachine().Options.GuaranteedTailCallOpt) {
if (IsTailCallConvention(CalleeCC) && CCMatch)
return true;
return false;
}
// Look for obvious safe cases to perform tail call optimization that do not
// require ABI changes. This is what gcc calls sibcall.
// Can't do sibcall if stack needs to be dynamically re-aligned. PEI needs to
// emit a special epilogue.
if (RegInfo->needsStackRealignment(MF))
return false;
// Also avoid sibcall optimization if either caller or callee uses struct
// return semantics.
if (isCalleeStructRet || isCallerStructRet)
return false;
// An stdcall caller is expected to clean up its arguments; the callee
// isn't going to do that.
if (!CCMatch && CallerCC==CallingConv::X86_StdCall)
return false;
// Do not sibcall optimize vararg calls unless all arguments are passed via
// registers.
if (isVarArg && !Outs.empty()) {
// Optimizing for varargs on Win64 is unlikely to be safe without
// additional testing.
if (Subtarget->isTargetWin64())
return false;
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), ArgLocs, *DAG.getContext());
CCInfo.AnalyzeCallOperands(Outs, CC_X86);
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i)
if (!ArgLocs[i].isRegLoc())
return false;
}
// If the call result is in ST0 / ST1, it needs to be popped off the x87
// stack. Therefore, if it's not used by the call it is not safe to optimize
// this into a sibcall.
bool Unused = false;
for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
if (!Ins[i].Used) {
Unused = true;
break;
}
}
if (Unused) {
SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CalleeCC, false, DAG.getMachineFunction(),
getTargetMachine(), RVLocs, *DAG.getContext());
CCInfo.AnalyzeCallResult(Ins, RetCC_X86);
for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
CCValAssign &VA = RVLocs[i];
if (VA.getLocReg() == X86::ST0 || VA.getLocReg() == X86::ST1)
return false;
}
}
// If the calling conventions do not match, then we'd better make sure the
// results are returned in the same way as what the caller expects.
if (!CCMatch) {
SmallVector<CCValAssign, 16> RVLocs1;
CCState CCInfo1(CalleeCC, false, DAG.getMachineFunction(),
getTargetMachine(), RVLocs1, *DAG.getContext());
CCInfo1.AnalyzeCallResult(Ins, RetCC_X86);
SmallVector<CCValAssign, 16> RVLocs2;
CCState CCInfo2(CallerCC, false, DAG.getMachineFunction(),
getTargetMachine(), RVLocs2, *DAG.getContext());
CCInfo2.AnalyzeCallResult(Ins, RetCC_X86);
if (RVLocs1.size() != RVLocs2.size())
return false;
for (unsigned i = 0, e = RVLocs1.size(); i != e; ++i) {
if (RVLocs1[i].isRegLoc() != RVLocs2[i].isRegLoc())
return false;
if (RVLocs1[i].getLocInfo() != RVLocs2[i].getLocInfo())
return false;
if (RVLocs1[i].isRegLoc()) {
if (RVLocs1[i].getLocReg() != RVLocs2[i].getLocReg())
return false;
} else {
if (RVLocs1[i].getLocMemOffset() != RVLocs2[i].getLocMemOffset())
return false;
}
}
}
// If the callee takes no arguments then go on to check the results of the
// call.
if (!Outs.empty()) {
// Check if stack adjustment is needed. For now, do not do this if any
// argument is passed on the stack.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), ArgLocs, *DAG.getContext());
// Allocate shadow area for Win64
if (Subtarget->isTargetWin64()) {
CCInfo.AllocateStack(32, 8);
}
CCInfo.AnalyzeCallOperands(Outs, CC_X86);
if (CCInfo.getNextStackOffset()) {
MachineFunction &MF = DAG.getMachineFunction();
if (MF.getInfo<X86MachineFunctionInfo>()->getBytesToPopOnReturn())
return false;
// Check if the arguments are already laid out in the right way as
// the caller's fixed stack objects.
MachineFrameInfo *MFI = MF.getFrameInfo();
const MachineRegisterInfo *MRI = &MF.getRegInfo();
const X86InstrInfo *TII =
((X86TargetMachine&)getTargetMachine()).getInstrInfo();
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
SDValue Arg = OutVals[i];
ISD::ArgFlagsTy Flags = Outs[i].Flags;
if (VA.getLocInfo() == CCValAssign::Indirect)
return false;
if (!VA.isRegLoc()) {
if (!MatchingStackOffset(Arg, VA.getLocMemOffset(), Flags,
MFI, MRI, TII))
return false;
}
}
}
// If the tailcall address may be in a register, then make sure it's
// possible to register allocate for it. In 32-bit, the call address can
// only target EAX, EDX, or ECX since the tail call must be scheduled after
// callee-saved registers are restored. These happen to be the same
// registers used to pass 'inreg' arguments so watch out for those.
if (!Subtarget->is64Bit() &&
!isa<GlobalAddressSDNode>(Callee) &&
!isa<ExternalSymbolSDNode>(Callee)) {
unsigned NumInRegs = 0;
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
if (!VA.isRegLoc())
continue;
unsigned Reg = VA.getLocReg();
switch (Reg) {
default: break;
case X86::EAX: case X86::EDX: case X86::ECX:
if (++NumInRegs == 3)
return false;
break;
}
}
}
}
return true;
}
FastISel *
X86TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo) const {
return X86::createFastISel(funcInfo);
}
//===----------------------------------------------------------------------===//
// Other Lowering Hooks
//===----------------------------------------------------------------------===//
static bool MayFoldLoad(SDValue Op) {
return Op.hasOneUse() && ISD::isNormalLoad(Op.getNode());
}
static bool MayFoldIntoStore(SDValue Op) {
return Op.hasOneUse() && ISD::isNormalStore(*Op.getNode()->use_begin());
}
static bool isTargetShuffle(unsigned Opcode) {
switch(Opcode) {
default: return false;
case X86ISD::PSHUFD:
case X86ISD::PSHUFHW:
case X86ISD::PSHUFLW:
case X86ISD::SHUFP:
case X86ISD::PALIGN:
case X86ISD::MOVLHPS:
case X86ISD::MOVLHPD:
case X86ISD::MOVHLPS:
case X86ISD::MOVLPS:
case X86ISD::MOVLPD:
case X86ISD::MOVSHDUP:
case X86ISD::MOVSLDUP:
case X86ISD::MOVDDUP:
case X86ISD::MOVSS:
case X86ISD::MOVSD:
case X86ISD::UNPCKL:
case X86ISD::UNPCKH:
case X86ISD::VPERMILP:
case X86ISD::VPERM2X128:
return true;
}
}
static SDValue getTargetShuffleNode(unsigned Opc, DebugLoc dl, EVT VT,
SDValue V1, SelectionDAG &DAG) {
switch(Opc) {
default: llvm_unreachable("Unknown x86 shuffle node");
case X86ISD::MOVSHDUP:
case X86ISD::MOVSLDUP:
case X86ISD::MOVDDUP:
return DAG.getNode(Opc, dl, VT, V1);
}
}
static SDValue getTargetShuffleNode(unsigned Opc, DebugLoc dl, EVT VT,
SDValue V1, unsigned TargetMask,
SelectionDAG &DAG) {
switch(Opc) {
default: llvm_unreachable("Unknown x86 shuffle node");
case X86ISD::PSHUFD:
case X86ISD::PSHUFHW:
case X86ISD::PSHUFLW:
case X86ISD::VPERMILP:
case X86ISD::VPERMI:
return DAG.getNode(Opc, dl, VT, V1, DAG.getConstant(TargetMask, MVT::i8));
}
}
static SDValue getTargetShuffleNode(unsigned Opc, DebugLoc dl, EVT VT,
SDValue V1, SDValue V2, unsigned TargetMask,
SelectionDAG &DAG) {
switch(Opc) {
default: llvm_unreachable("Unknown x86 shuffle node");
case X86ISD::PALIGN:
case X86ISD::SHUFP:
case X86ISD::VPERM2X128:
return DAG.getNode(Opc, dl, VT, V1, V2,
DAG.getConstant(TargetMask, MVT::i8));
}
}
static SDValue getTargetShuffleNode(unsigned Opc, DebugLoc dl, EVT VT,
SDValue V1, SDValue V2, SelectionDAG &DAG) {
switch(Opc) {
default: llvm_unreachable("Unknown x86 shuffle node");
case X86ISD::MOVLHPS:
case X86ISD::MOVLHPD:
case X86ISD::MOVHLPS:
case X86ISD::MOVLPS:
case X86ISD::MOVLPD:
case X86ISD::MOVSS:
case X86ISD::MOVSD:
case X86ISD::UNPCKL:
case X86ISD::UNPCKH:
return DAG.getNode(Opc, dl, VT, V1, V2);
}
}
SDValue X86TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
int ReturnAddrIndex = FuncInfo->getRAIndex();
if (ReturnAddrIndex == 0) {
// Set up a frame object for the return address.
uint64_t SlotSize = TD->getPointerSize();
ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(SlotSize, -SlotSize,
false);
FuncInfo->setRAIndex(ReturnAddrIndex);
}
return DAG.getFrameIndex(ReturnAddrIndex, getPointerTy());
}
bool X86::isOffsetSuitableForCodeModel(int64_t Offset, CodeModel::Model M,
bool hasSymbolicDisplacement) {
// Offset should fit into 32 bit immediate field.
if (!isInt<32>(Offset))
return false;
// If we don't have a symbolic displacement - we don't have any extra
// restrictions.
if (!hasSymbolicDisplacement)
return true;
// FIXME: Some tweaks might be needed for medium code model.
if (M != CodeModel::Small && M != CodeModel::Kernel)
return false;
// For small code model we assume that latest object is 16MB before end of 31
// bits boundary. We may also accept pretty large negative constants knowing
// that all objects are in the positive half of address space.
if (M == CodeModel::Small && Offset < 16*1024*1024)
return true;
// For kernel code model we know that all object resist in the negative half
// of 32bits address space. We may not accept negative offsets, since they may
// be just off and we may accept pretty large positive ones.
if (M == CodeModel::Kernel && Offset > 0)
return true;
return false;
}
/// isCalleePop - Determines whether the callee is required to pop its
/// own arguments. Callee pop is necessary to support tail calls.
bool X86::isCalleePop(CallingConv::ID CallingConv,
bool is64Bit, bool IsVarArg, bool TailCallOpt) {
if (IsVarArg)
return false;
switch (CallingConv) {
default:
return false;
case CallingConv::X86_StdCall:
return !is64Bit;
case CallingConv::X86_FastCall:
return !is64Bit;
case CallingConv::X86_ThisCall:
return !is64Bit;
case CallingConv::Fast:
return TailCallOpt;
case CallingConv::GHC:
return TailCallOpt;
}
}
/// TranslateX86CC - do a one to one translation of a ISD::CondCode to the X86
/// specific condition code, returning the condition code and the LHS/RHS of the
/// comparison to make.
static unsigned TranslateX86CC(ISD::CondCode SetCCOpcode, bool isFP,
SDValue &LHS, SDValue &RHS, SelectionDAG &DAG) {
if (!isFP) {
if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) {
if (SetCCOpcode == ISD::SETGT && RHSC->isAllOnesValue()) {
// X > -1 -> X == 0, jump !sign.
RHS = DAG.getConstant(0, RHS.getValueType());
return X86::COND_NS;
}
if (SetCCOpcode == ISD::SETLT && RHSC->isNullValue()) {
// X < 0 -> X == 0, jump on sign.
return X86::COND_S;
}
if (SetCCOpcode == ISD::SETLT && RHSC->getZExtValue() == 1) {
// X < 1 -> X <= 0
RHS = DAG.getConstant(0, RHS.getValueType());
return X86::COND_LE;
}
}
switch (SetCCOpcode) {
default: llvm_unreachable("Invalid integer condition!");
case ISD::SETEQ: return X86::COND_E;
case ISD::SETGT: return X86::COND_G;
case ISD::SETGE: return X86::COND_GE;
case ISD::SETLT: return X86::COND_L;
case ISD::SETLE: return X86::COND_LE;
case ISD::SETNE: return X86::COND_NE;
case ISD::SETULT: return X86::COND_B;
case ISD::SETUGT: return X86::COND_A;
case ISD::SETULE: return X86::COND_BE;
case ISD::SETUGE: return X86::COND_AE;
}
}
// First determine if it is required or is profitable to flip the operands.
// If LHS is a foldable load, but RHS is not, flip the condition.
if (ISD::isNON_EXTLoad(LHS.getNode()) &&
!ISD::isNON_EXTLoad(RHS.getNode())) {
SetCCOpcode = getSetCCSwappedOperands(SetCCOpcode);
std::swap(LHS, RHS);
}
switch (SetCCOpcode) {
default: break;
case ISD::SETOLT:
case ISD::SETOLE:
case ISD::SETUGT:
case ISD::SETUGE:
std::swap(LHS, RHS);
break;
}
// On a floating point condition, the flags are set as follows:
// ZF PF CF op
// 0 | 0 | 0 | X > Y
// 0 | 0 | 1 | X < Y
// 1 | 0 | 0 | X == Y
// 1 | 1 | 1 | unordered
switch (SetCCOpcode) {
default: llvm_unreachable("Condcode should be pre-legalized away");
case ISD::SETUEQ:
case ISD::SETEQ: return X86::COND_E;
case ISD::SETOLT: // flipped
case ISD::SETOGT:
case ISD::SETGT: return X86::COND_A;
case ISD::SETOLE: // flipped
case ISD::SETOGE:
case ISD::SETGE: return X86::COND_AE;
case ISD::SETUGT: // flipped
case ISD::SETULT:
case ISD::SETLT: return X86::COND_B;
case ISD::SETUGE: // flipped
case ISD::SETULE:
case ISD::SETLE: return X86::COND_BE;
case ISD::SETONE:
case ISD::SETNE: return X86::COND_NE;
case ISD::SETUO: return X86::COND_P;
case ISD::SETO: return X86::COND_NP;
case ISD::SETOEQ:
case ISD::SETUNE: return X86::COND_INVALID;
}
}
/// hasFPCMov - is there a floating point cmov for the specific X86 condition
/// code. Current x86 isa includes the following FP cmov instructions:
/// fcmovb, fcomvbe, fcomve, fcmovu, fcmovae, fcmova, fcmovne, fcmovnu.
static bool hasFPCMov(unsigned X86CC) {
switch (X86CC) {
default:
return false;
case X86::COND_B:
case X86::COND_BE:
case X86::COND_E:
case X86::COND_P:
case X86::COND_A:
case X86::COND_AE:
case X86::COND_NE:
case X86::COND_NP:
return true;
}
}
/// isFPImmLegal - Returns true if the target can instruction select the
/// specified FP immediate natively. If false, the legalizer will
/// materialize the FP immediate as a load from a constant pool.
bool X86TargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
for (unsigned i = 0, e = LegalFPImmediates.size(); i != e; ++i) {
if (Imm.bitwiseIsEqual(LegalFPImmediates[i]))
return true;
}
return false;
}
/// isUndefOrInRange - Return true if Val is undef or if its value falls within
/// the specified range (L, H].
static bool isUndefOrInRange(int Val, int Low, int Hi) {
return (Val < 0) || (Val >= Low && Val < Hi);
}
/// isUndefOrEqual - Val is either less than zero (undef) or equal to the
/// specified value.
static bool isUndefOrEqual(int Val, int CmpVal) {
if (Val < 0 || Val == CmpVal)
return true;
return false;
}
/// isSequentialOrUndefInRange - Return true if every element in Mask, begining
/// from position Pos and ending in Pos+Size, falls within the specified
/// sequential range (L, L+Pos]. or is undef.
static bool isSequentialOrUndefInRange(ArrayRef<int> Mask,
int Pos, int Size, int Low) {
for (int i = Pos, e = Pos+Size; i != e; ++i, ++Low)
if (!isUndefOrEqual(Mask[i], Low))
return false;
return true;
}
/// isPSHUFDMask - Return true if the node specifies a shuffle of elements that
/// is suitable for input to PSHUFD or PSHUFW. That is, it doesn't reference
/// the second operand.
static bool isPSHUFDMask(ArrayRef<int> Mask, EVT VT) {
if (VT == MVT::v4f32 || VT == MVT::v4i32 )
return (Mask[0] < 4 && Mask[1] < 4 && Mask[2] < 4 && Mask[3] < 4);
if (VT == MVT::v2f64 || VT == MVT::v2i64)
return (Mask[0] < 2 && Mask[1] < 2);
return false;
}
/// isPSHUFHWMask - Return true if the node specifies a shuffle of elements that
/// is suitable for input to PSHUFHW.
static bool isPSHUFHWMask(ArrayRef<int> Mask, EVT VT, bool HasAVX2) {
if (VT != MVT::v8i16 && (!HasAVX2 || VT != MVT::v16i16))
return false;
// Lower quadword copied in order or undef.
if (!isSequentialOrUndefInRange(Mask, 0, 4, 0))
return false;
// Upper quadword shuffled.
for (unsigned i = 4; i != 8; ++i)
if (!isUndefOrInRange(Mask[i], 4, 8))
return false;
if (VT == MVT::v16i16) {
// Lower quadword copied in order or undef.
if (!isSequentialOrUndefInRange(Mask, 8, 4, 8))
return false;
// Upper quadword shuffled.
for (unsigned i = 12; i != 16; ++i)
if (!isUndefOrInRange(Mask[i], 12, 16))
return false;
}
return true;
}
/// isPSHUFLWMask - Return true if the node specifies a shuffle of elements that
/// is suitable for input to PSHUFLW.
static bool isPSHUFLWMask(ArrayRef<int> Mask, EVT VT, bool HasAVX2) {
if (VT != MVT::v8i16 && (!HasAVX2 || VT != MVT::v16i16))
return false;
// Upper quadword copied in order.
if (!isSequentialOrUndefInRange(Mask, 4, 4, 4))
return false;
// Lower quadword shuffled.
for (unsigned i = 0; i != 4; ++i)
if (!isUndefOrInRange(Mask[i], 0, 4))
return false;
if (VT == MVT::v16i16) {
// Upper quadword copied in order.
if (!isSequentialOrUndefInRange(Mask, 12, 4, 12))
return false;
// Lower quadword shuffled.
for (unsigned i = 8; i != 12; ++i)
if (!isUndefOrInRange(Mask[i], 8, 12))
return false;
}
return true;
}
/// isPALIGNRMask - Return true if the node specifies a shuffle of elements that
/// is suitable for input to PALIGNR.
static bool isPALIGNRMask(ArrayRef<int> Mask, EVT VT,
const X86Subtarget *Subtarget) {
if ((VT.getSizeInBits() == 128 && !Subtarget->hasSSSE3()) ||
(VT.getSizeInBits() == 256 && !Subtarget->hasAVX2()))
return false;
unsigned NumElts = VT.getVectorNumElements();
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElts = NumElts/NumLanes;
// Do not handle 64-bit element shuffles with palignr.
if (NumLaneElts == 2)
return false;
for (unsigned l = 0; l != NumElts; l+=NumLaneElts) {
unsigned i;
for (i = 0; i != NumLaneElts; ++i) {
if (Mask[i+l] >= 0)
break;
}
// Lane is all undef, go to next lane
if (i == NumLaneElts)
continue;
int Start = Mask[i+l];
// Make sure its in this lane in one of the sources
if (!isUndefOrInRange(Start, l, l+NumLaneElts) &&
!isUndefOrInRange(Start, l+NumElts, l+NumElts+NumLaneElts))
return false;
// If not lane 0, then we must match lane 0
if (l != 0 && Mask[i] >= 0 && !isUndefOrEqual(Start, Mask[i]+l))
return false;
// Correct second source to be contiguous with first source
if (Start >= (int)NumElts)
Start -= NumElts - NumLaneElts;
// Make sure we're shifting in the right direction.
if (Start <= (int)(i+l))
return false;
Start -= i;
// Check the rest of the elements to see if they are consecutive.
for (++i; i != NumLaneElts; ++i) {
int Idx = Mask[i+l];
// Make sure its in this lane
if (!isUndefOrInRange(Idx, l, l+NumLaneElts) &&
!isUndefOrInRange(Idx, l+NumElts, l+NumElts+NumLaneElts))
return false;
// If not lane 0, then we must match lane 0
if (l != 0 && Mask[i] >= 0 && !isUndefOrEqual(Idx, Mask[i]+l))
return false;
if (Idx >= (int)NumElts)
Idx -= NumElts - NumLaneElts;
if (!isUndefOrEqual(Idx, Start+i))
return false;
}
}
return true;
}
/// CommuteVectorShuffleMask - Change values in a shuffle permute mask assuming
/// the two vector operands have swapped position.
static void CommuteVectorShuffleMask(SmallVectorImpl<int> &Mask,
unsigned NumElems) {
for (unsigned i = 0; i != NumElems; ++i) {
int idx = Mask[i];
if (idx < 0)
continue;
else if (idx < (int)NumElems)
Mask[i] = idx + NumElems;
else
Mask[i] = idx - NumElems;
}
}
/// isSHUFPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to 128/256-bit
/// SHUFPS and SHUFPD. If Commuted is true, then it checks for sources to be
/// reverse of what x86 shuffles want.
static bool isSHUFPMask(ArrayRef<int> Mask, EVT VT, bool HasAVX,
bool Commuted = false) {
if (!HasAVX && VT.getSizeInBits() == 256)
return false;
unsigned NumElems = VT.getVectorNumElements();
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElems = NumElems/NumLanes;
if (NumLaneElems != 2 && NumLaneElems != 4)
return false;
// VSHUFPSY divides the resulting vector into 4 chunks.
// The sources are also splitted into 4 chunks, and each destination
// chunk must come from a different source chunk.
//
// SRC1 => X7 X6 X5 X4 X3 X2 X1 X0
// SRC2 => Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y9
//
// DST => Y7..Y4, Y7..Y4, X7..X4, X7..X4,
// Y3..Y0, Y3..Y0, X3..X0, X3..X0
//
// VSHUFPDY divides the resulting vector into 4 chunks.
// The sources are also splitted into 4 chunks, and each destination
// chunk must come from a different source chunk.
//
// SRC1 => X3 X2 X1 X0
// SRC2 => Y3 Y2 Y1 Y0
//
// DST => Y3..Y2, X3..X2, Y1..Y0, X1..X0
//
unsigned HalfLaneElems = NumLaneElems/2;
for (unsigned l = 0; l != NumElems; l += NumLaneElems) {
for (unsigned i = 0; i != NumLaneElems; ++i) {
int Idx = Mask[i+l];
unsigned RngStart = l + ((Commuted == (i<HalfLaneElems)) ? NumElems : 0);
if (!isUndefOrInRange(Idx, RngStart, RngStart+NumLaneElems))
return false;
// For VSHUFPSY, the mask of the second half must be the same as the
// first but with the appropriate offsets. This works in the same way as
// VPERMILPS works with masks.
if (NumElems != 8 || l == 0 || Mask[i] < 0)
continue;
if (!isUndefOrEqual(Idx, Mask[i]+l))
return false;
}
}
return true;
}
/// isMOVHLPSMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVHLPS.
static bool isMOVHLPSMask(ArrayRef<int> Mask, EVT VT) {
unsigned NumElems = VT.getVectorNumElements();
if (VT.getSizeInBits() != 128)
return false;
if (NumElems != 4)
return false;
// Expect bit0 == 6, bit1 == 7, bit2 == 2, bit3 == 3
return isUndefOrEqual(Mask[0], 6) &&
isUndefOrEqual(Mask[1], 7) &&
isUndefOrEqual(Mask[2], 2) &&
isUndefOrEqual(Mask[3], 3);
}
/// isMOVHLPS_v_undef_Mask - Special case of isMOVHLPSMask for canonical form
/// of vector_shuffle v, v, <2, 3, 2, 3>, i.e. vector_shuffle v, undef,
/// <2, 3, 2, 3>
static bool isMOVHLPS_v_undef_Mask(ArrayRef<int> Mask, EVT VT) {
unsigned NumElems = VT.getVectorNumElements();
if (VT.getSizeInBits() != 128)
return false;
if (NumElems != 4)
return false;
return isUndefOrEqual(Mask[0], 2) &&
isUndefOrEqual(Mask[1], 3) &&
isUndefOrEqual(Mask[2], 2) &&
isUndefOrEqual(Mask[3], 3);
}
/// isMOVLPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVLP{S|D}.
static bool isMOVLPMask(ArrayRef<int> Mask, EVT VT) {
if (VT.getSizeInBits() != 128)
return false;
unsigned NumElems = VT.getVectorNumElements();
if (NumElems != 2 && NumElems != 4)
return false;
for (unsigned i = 0, e = NumElems/2; i != e; ++i)
if (!isUndefOrEqual(Mask[i], i + NumElems))
return false;
for (unsigned i = NumElems/2, e = NumElems; i != e; ++i)
if (!isUndefOrEqual(Mask[i], i))
return false;
return true;
}
/// isMOVLHPSMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVLHPS.
static bool isMOVLHPSMask(ArrayRef<int> Mask, EVT VT) {
unsigned NumElems = VT.getVectorNumElements();
if ((NumElems != 2 && NumElems != 4)
|| VT.getSizeInBits() > 128)
return false;
for (unsigned i = 0, e = NumElems/2; i != e; ++i)
if (!isUndefOrEqual(Mask[i], i))
return false;
for (unsigned i = 0, e = NumElems/2; i != e; ++i)
if (!isUndefOrEqual(Mask[i + e], i + NumElems))
return false;
return true;
}
/// isUNPCKLMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to UNPCKL.
static bool isUNPCKLMask(ArrayRef<int> Mask, EVT VT,
bool HasAVX2, bool V2IsSplat = false) {
unsigned NumElts = VT.getVectorNumElements();
assert((VT.is128BitVector() || VT.is256BitVector()) &&
"Unsupported vector type for unpckh");
if (VT.getSizeInBits() == 256 && NumElts != 4 && NumElts != 8 &&
(!HasAVX2 || (NumElts != 16 && NumElts != 32)))
return false;
// Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
// independently on 128-bit lanes.
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElts = NumElts/NumLanes;
for (unsigned l = 0; l != NumLanes; ++l) {
for (unsigned i = l*NumLaneElts, j = l*NumLaneElts;
i != (l+1)*NumLaneElts;
i += 2, ++j) {
int BitI = Mask[i];
int BitI1 = Mask[i+1];
if (!isUndefOrEqual(BitI, j))
return false;
if (V2IsSplat) {
if (!isUndefOrEqual(BitI1, NumElts))
return false;
} else {
if (!isUndefOrEqual(BitI1, j + NumElts))
return false;
}
}
}
return true;
}
/// isUNPCKHMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to UNPCKH.
static bool isUNPCKHMask(ArrayRef<int> Mask, EVT VT,
bool HasAVX2, bool V2IsSplat = false) {
unsigned NumElts = VT.getVectorNumElements();
assert((VT.is128BitVector() || VT.is256BitVector()) &&
"Unsupported vector type for unpckh");
if (VT.getSizeInBits() == 256 && NumElts != 4 && NumElts != 8 &&
(!HasAVX2 || (NumElts != 16 && NumElts != 32)))
return false;
// Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
// independently on 128-bit lanes.
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElts = NumElts/NumLanes;
for (unsigned l = 0; l != NumLanes; ++l) {
for (unsigned i = l*NumLaneElts, j = (l*NumLaneElts)+NumLaneElts/2;
i != (l+1)*NumLaneElts; i += 2, ++j) {
int BitI = Mask[i];
int BitI1 = Mask[i+1];
if (!isUndefOrEqual(BitI, j))
return false;
if (V2IsSplat) {
if (isUndefOrEqual(BitI1, NumElts))
return false;
} else {
if (!isUndefOrEqual(BitI1, j+NumElts))
return false;
}
}
}
return true;
}
/// isUNPCKL_v_undef_Mask - Special case of isUNPCKLMask for canonical form
/// of vector_shuffle v, v, <0, 4, 1, 5>, i.e. vector_shuffle v, undef,
/// <0, 0, 1, 1>
static bool isUNPCKL_v_undef_Mask(ArrayRef<int> Mask, EVT VT,
bool HasAVX2) {
unsigned NumElts = VT.getVectorNumElements();
assert((VT.is128BitVector() || VT.is256BitVector()) &&
"Unsupported vector type for unpckh");
if (VT.getSizeInBits() == 256 && NumElts != 4 && NumElts != 8 &&
(!HasAVX2 || (NumElts != 16 && NumElts != 32)))
return false;
// For 256-bit i64/f64, use MOVDDUPY instead, so reject the matching pattern
// FIXME: Need a better way to get rid of this, there's no latency difference
// between UNPCKLPD and MOVDDUP, the later should always be checked first and
// the former later. We should also remove the "_undef" special mask.
if (NumElts == 4 && VT.getSizeInBits() == 256)
return false;
// Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
// independently on 128-bit lanes.
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElts = NumElts/NumLanes;
for (unsigned l = 0; l != NumLanes; ++l) {
for (unsigned i = l*NumLaneElts, j = l*NumLaneElts;
i != (l+1)*NumLaneElts;
i += 2, ++j) {
int BitI = Mask[i];
int BitI1 = Mask[i+1];
if (!isUndefOrEqual(BitI, j))
return false;
if (!isUndefOrEqual(BitI1, j))
return false;
}
}
return true;
}
/// isUNPCKH_v_undef_Mask - Special case of isUNPCKHMask for canonical form
/// of vector_shuffle v, v, <2, 6, 3, 7>, i.e. vector_shuffle v, undef,
/// <2, 2, 3, 3>
static bool isUNPCKH_v_undef_Mask(ArrayRef<int> Mask, EVT VT, bool HasAVX2) {
unsigned NumElts = VT.getVectorNumElements();
assert((VT.is128BitVector() || VT.is256BitVector()) &&
"Unsupported vector type for unpckh");
if (VT.getSizeInBits() == 256 && NumElts != 4 && NumElts != 8 &&
(!HasAVX2 || (NumElts != 16 && NumElts != 32)))
return false;
// Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
// independently on 128-bit lanes.
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElts = NumElts/NumLanes;
for (unsigned l = 0; l != NumLanes; ++l) {
for (unsigned i = l*NumLaneElts, j = (l*NumLaneElts)+NumLaneElts/2;
i != (l+1)*NumLaneElts; i += 2, ++j) {
int BitI = Mask[i];
int BitI1 = Mask[i+1];
if (!isUndefOrEqual(BitI, j))
return false;
if (!isUndefOrEqual(BitI1, j))
return false;
}
}
return true;
}
/// isMOVLMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVSS,
/// MOVSD, and MOVD, i.e. setting the lowest element.
static bool isMOVLMask(ArrayRef<int> Mask, EVT VT) {
if (VT.getVectorElementType().getSizeInBits() < 32)
return false;
if (VT.getSizeInBits() == 256)
return false;
unsigned NumElts = VT.getVectorNumElements();
if (!isUndefOrEqual(Mask[0], NumElts))
return false;
for (unsigned i = 1; i != NumElts; ++i)
if (!isUndefOrEqual(Mask[i], i))
return false;
return true;
}
/// isVPERM2X128Mask - Match 256-bit shuffles where the elements are considered
/// as permutations between 128-bit chunks or halves. As an example: this
/// shuffle bellow:
/// vector_shuffle <4, 5, 6, 7, 12, 13, 14, 15>
/// The first half comes from the second half of V1 and the second half from the
/// the second half of V2.
static bool isVPERM2X128Mask(ArrayRef<int> Mask, EVT VT, bool HasAVX) {
if (!HasAVX || VT.getSizeInBits() != 256)
return false;
// The shuffle result is divided into half A and half B. In total the two
// sources have 4 halves, namely: C, D, E, F. The final values of A and
// B must come from C, D, E or F.
unsigned HalfSize = VT.getVectorNumElements()/2;
bool MatchA = false, MatchB = false;
// Check if A comes from one of C, D, E, F.
for (unsigned Half = 0; Half != 4; ++Half) {
if (isSequentialOrUndefInRange(Mask, 0, HalfSize, Half*HalfSize)) {
MatchA = true;
break;
}
}
// Check if B comes from one of C, D, E, F.
for (unsigned Half = 0; Half != 4; ++Half) {
if (isSequentialOrUndefInRange(Mask, HalfSize, HalfSize, Half*HalfSize)) {
MatchB = true;
break;
}
}
return MatchA && MatchB;
}
/// getShuffleVPERM2X128Immediate - Return the appropriate immediate to shuffle
/// the specified VECTOR_MASK mask with VPERM2F128/VPERM2I128 instructions.
static unsigned getShuffleVPERM2X128Immediate(ShuffleVectorSDNode *SVOp) {
EVT VT = SVOp->getValueType(0);
unsigned HalfSize = VT.getVectorNumElements()/2;
unsigned FstHalf = 0, SndHalf = 0;
for (unsigned i = 0; i < HalfSize; ++i) {
if (SVOp->getMaskElt(i) > 0) {
FstHalf = SVOp->getMaskElt(i)/HalfSize;
break;
}
}
for (unsigned i = HalfSize; i < HalfSize*2; ++i) {
if (SVOp->getMaskElt(i) > 0) {
SndHalf = SVOp->getMaskElt(i)/HalfSize;
break;
}
}
return (FstHalf | (SndHalf << 4));
}
/// isVPERMILPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to VPERMILPD*.
/// Note that VPERMIL mask matching is different depending whether theunderlying
/// type is 32 or 64. In the VPERMILPS the high half of the mask should point
/// to the same elements of the low, but to the higher half of the source.
/// In VPERMILPD the two lanes could be shuffled independently of each other
/// with the same restriction that lanes can't be crossed. Also handles PSHUFDY.
static bool isVPERMILPMask(ArrayRef<int> Mask, EVT VT, bool HasAVX) {
if (!HasAVX)
return false;
unsigned NumElts = VT.getVectorNumElements();
// Only match 256-bit with 32/64-bit types
if (VT.getSizeInBits() != 256 || (NumElts != 4 && NumElts != 8))
return false;
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned LaneSize = NumElts/NumLanes;
for (unsigned l = 0; l != NumElts; l += LaneSize) {
for (unsigned i = 0; i != LaneSize; ++i) {
if (!isUndefOrInRange(Mask[i+l], l, l+LaneSize))
return false;
if (NumElts != 8 || l == 0)
continue;
// VPERMILPS handling
if (Mask[i] < 0)
continue;
if (!isUndefOrEqual(Mask[i+l], Mask[i]+l))
return false;
}
}
return true;
}
/// isCommutedMOVLMask - Returns true if the shuffle mask is except the reverse
/// of what x86 movss want. X86 movs requires the lowest element to be lowest
/// element of vector 2 and the other elements to come from vector 1 in order.
static bool isCommutedMOVLMask(ArrayRef<int> Mask, EVT VT,
bool V2IsSplat = false, bool V2IsUndef = false) {
unsigned NumOps = VT.getVectorNumElements();
if (VT.getSizeInBits() == 256)
return false;
if (NumOps != 2 && NumOps != 4 && NumOps != 8 && NumOps != 16)
return false;
if (!isUndefOrEqual(Mask[0], 0))
return false;
for (unsigned i = 1; i != NumOps; ++i)
if (!(isUndefOrEqual(Mask[i], i+NumOps) ||
(V2IsUndef && isUndefOrInRange(Mask[i], NumOps, NumOps*2)) ||
(V2IsSplat && isUndefOrEqual(Mask[i], NumOps))))
return false;
return true;
}
/// isMOVSHDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVSHDUP.
/// Masks to match: <1, 1, 3, 3> or <1, 1, 3, 3, 5, 5, 7, 7>
static bool isMOVSHDUPMask(ArrayRef<int> Mask, EVT VT,
const X86Subtarget *Subtarget) {
if (!Subtarget->hasSSE3())
return false;
unsigned NumElems = VT.getVectorNumElements();
if ((VT.getSizeInBits() == 128 && NumElems != 4) ||
(VT.getSizeInBits() == 256 && NumElems != 8))
return false;
// "i+1" is the value the indexed mask element must have
for (unsigned i = 0; i != NumElems; i += 2)
if (!isUndefOrEqual(Mask[i], i+1) ||
!isUndefOrEqual(Mask[i+1], i+1))
return false;
return true;
}
/// isMOVSLDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to MOVSLDUP.
/// Masks to match: <0, 0, 2, 2> or <0, 0, 2, 2, 4, 4, 6, 6>
static bool isMOVSLDUPMask(ArrayRef<int> Mask, EVT VT,
const X86Subtarget *Subtarget) {
if (!Subtarget->hasSSE3())
return false;
unsigned NumElems = VT.getVectorNumElements();
if ((VT.getSizeInBits() == 128 && NumElems != 4) ||
(VT.getSizeInBits() == 256 && NumElems != 8))
return false;
// "i" is the value the indexed mask element must have
for (unsigned i = 0; i != NumElems; i += 2)
if (!isUndefOrEqual(Mask[i], i) ||
!isUndefOrEqual(Mask[i+1], i))
return false;
return true;
}
/// isMOVDDUPYMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to 256-bit
/// version of MOVDDUP.
static bool isMOVDDUPYMask(ArrayRef<int> Mask, EVT VT, bool HasAVX) {
unsigned NumElts = VT.getVectorNumElements();
if (!HasAVX || VT.getSizeInBits() != 256 || NumElts != 4)
return false;
for (unsigned i = 0; i != NumElts/2; ++i)
if (!isUndefOrEqual(Mask[i], 0))
return false;
for (unsigned i = NumElts/2; i != NumElts; ++i)
if (!isUndefOrEqual(Mask[i], NumElts/2))
return false;
return true;
}
/// isMOVDDUPMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a shuffle of elements that is suitable for input to 128-bit
/// version of MOVDDUP.
static bool isMOVDDUPMask(ArrayRef<int> Mask, EVT VT) {
if (VT.getSizeInBits() != 128)
return false;
unsigned e = VT.getVectorNumElements() / 2;
for (unsigned i = 0; i != e; ++i)
if (!isUndefOrEqual(Mask[i], i))
return false;
for (unsigned i = 0; i != e; ++i)
if (!isUndefOrEqual(Mask[e+i], i))
return false;
return true;
}
/// isVEXTRACTF128Index - Return true if the specified
/// EXTRACT_SUBVECTOR operand specifies a vector extract that is
/// suitable for input to VEXTRACTF128.
bool X86::isVEXTRACTF128Index(SDNode *N) {
if (!isa<ConstantSDNode>(N->getOperand(1).getNode()))
return false;
// The index should be aligned on a 128-bit boundary.
uint64_t Index =
cast<ConstantSDNode>(N->getOperand(1).getNode())->getZExtValue();
unsigned VL = N->getValueType(0).getVectorNumElements();
unsigned VBits = N->getValueType(0).getSizeInBits();
unsigned ElSize = VBits / VL;
bool Result = (Index * ElSize) % 128 == 0;
return Result;
}
/// isVINSERTF128Index - Return true if the specified INSERT_SUBVECTOR
/// operand specifies a subvector insert that is suitable for input to
/// VINSERTF128.
bool X86::isVINSERTF128Index(SDNode *N) {
if (!isa<ConstantSDNode>(N->getOperand(2).getNode()))
return false;
// The index should be aligned on a 128-bit boundary.
uint64_t Index =
cast<ConstantSDNode>(N->getOperand(2).getNode())->getZExtValue();
unsigned VL = N->getValueType(0).getVectorNumElements();
unsigned VBits = N->getValueType(0).getSizeInBits();
unsigned ElSize = VBits / VL;
bool Result = (Index * ElSize) % 128 == 0;
return Result;
}
/// getShuffleSHUFImmediate - Return the appropriate immediate to shuffle
/// the specified VECTOR_SHUFFLE mask with PSHUF* and SHUFP* instructions.
/// Handles 128-bit and 256-bit.
static unsigned getShuffleSHUFImmediate(ShuffleVectorSDNode *N) {
EVT VT = N->getValueType(0);
assert((VT.is128BitVector() || VT.is256BitVector()) &&
"Unsupported vector type for PSHUF/SHUFP");
// Handle 128 and 256-bit vector lengths. AVX defines PSHUF/SHUFP to operate
// independently on 128-bit lanes.
unsigned NumElts = VT.getVectorNumElements();
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElts = NumElts/NumLanes;
assert((NumLaneElts == 2 || NumLaneElts == 4) &&
"Only supports 2 or 4 elements per lane");
unsigned Shift = (NumLaneElts == 4) ? 1 : 0;
unsigned Mask = 0;
for (unsigned i = 0; i != NumElts; ++i) {
int Elt = N->getMaskElt(i);
if (Elt < 0) continue;
Elt %= NumLaneElts;
unsigned ShAmt = i << Shift;
if (ShAmt >= 8) ShAmt -= 8;
Mask |= Elt << ShAmt;
}
return Mask;
}
/// getShufflePSHUFHWImmediate - Return the appropriate immediate to shuffle
/// the specified VECTOR_SHUFFLE mask with the PSHUFHW instruction.
static unsigned getShufflePSHUFHWImmediate(ShuffleVectorSDNode *N) {
unsigned Mask = 0;
// 8 nodes, but we only care about the last 4.
for (unsigned i = 7; i >= 4; --i) {
int Val = N->getMaskElt(i);
if (Val >= 0)
Mask |= (Val - 4);
if (i != 4)
Mask <<= 2;
}
return Mask;
}
/// getShufflePSHUFLWImmediate - Return the appropriate immediate to shuffle
/// the specified VECTOR_SHUFFLE mask with the PSHUFLW instruction.
static unsigned getShufflePSHUFLWImmediate(ShuffleVectorSDNode *N) {
unsigned Mask = 0;
// 8 nodes, but we only care about the first 4.
for (int i = 3; i >= 0; --i) {
int Val = N->getMaskElt(i);
if (Val >= 0)
Mask |= Val;
if (i != 0)
Mask <<= 2;
}
return Mask;
}
/// getShufflePALIGNRImmediate - Return the appropriate immediate to shuffle
/// the specified VECTOR_SHUFFLE mask with the PALIGNR instruction.
static unsigned getShufflePALIGNRImmediate(ShuffleVectorSDNode *SVOp) {
EVT VT = SVOp->getValueType(0);
unsigned EltSize = VT.getVectorElementType().getSizeInBits() >> 3;
unsigned NumElts = VT.getVectorNumElements();
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElts = NumElts/NumLanes;
int Val = 0;
unsigned i;
for (i = 0; i != NumElts; ++i) {
Val = SVOp->getMaskElt(i);
if (Val >= 0)
break;
}
if (Val >= (int)NumElts)
Val -= NumElts - NumLaneElts;
assert(Val - i > 0 && "PALIGNR imm should be positive");
return (Val - i) * EltSize;
}
/// getExtractVEXTRACTF128Immediate - Return the appropriate immediate
/// to extract the specified EXTRACT_SUBVECTOR index with VEXTRACTF128
/// instructions.
unsigned X86::getExtractVEXTRACTF128Immediate(SDNode *N) {
if (!isa<ConstantSDNode>(N->getOperand(1).getNode()))
llvm_unreachable("Illegal extract subvector for VEXTRACTF128");
uint64_t Index =
cast<ConstantSDNode>(N->getOperand(1).getNode())->getZExtValue();
EVT VecVT = N->getOperand(0).getValueType();
EVT ElVT = VecVT.getVectorElementType();
unsigned NumElemsPerChunk = 128 / ElVT.getSizeInBits();
return Index / NumElemsPerChunk;
}
/// getInsertVINSERTF128Immediate - Return the appropriate immediate
/// to insert at the specified INSERT_SUBVECTOR index with VINSERTF128
/// instructions.
unsigned X86::getInsertVINSERTF128Immediate(SDNode *N) {
if (!isa<ConstantSDNode>(N->getOperand(2).getNode()))
llvm_unreachable("Illegal insert subvector for VINSERTF128");
uint64_t Index =
cast<ConstantSDNode>(N->getOperand(2).getNode())->getZExtValue();
EVT VecVT = N->getValueType(0);
EVT ElVT = VecVT.getVectorElementType();
unsigned NumElemsPerChunk = 128 / ElVT.getSizeInBits();
return Index / NumElemsPerChunk;
}
/// getShuffleCLImmediate - Return the appropriate immediate to shuffle
/// the specified VECTOR_SHUFFLE mask with VPERMQ and VPERMPD instructions.
/// Handles 256-bit.
static unsigned getShuffleCLImmediate(ShuffleVectorSDNode *N) {
EVT VT = N->getValueType(0);
unsigned NumElts = VT.getVectorNumElements();
assert((VT.is256BitVector() && NumElts == 4) &&
"Unsupported vector type for VPERMQ/VPERMPD");
unsigned Mask = 0;
for (unsigned i = 0; i != NumElts; ++i) {
int Elt = N->getMaskElt(i);
if (Elt < 0)
continue;
Mask |= Elt << (i*2);
}
return Mask;
}
/// isZeroNode - Returns true if Elt is a constant zero or a floating point
/// constant +0.0.
bool X86::isZeroNode(SDValue Elt) {
return ((isa<ConstantSDNode>(Elt) &&
cast<ConstantSDNode>(Elt)->isNullValue()) ||
(isa<ConstantFPSDNode>(Elt) &&
cast<ConstantFPSDNode>(Elt)->getValueAPF().isPosZero()));
}
/// CommuteVectorShuffle - Swap vector_shuffle operands as well as values in
/// their permute mask.
static SDValue CommuteVectorShuffle(ShuffleVectorSDNode *SVOp,
SelectionDAG &DAG) {
EVT VT = SVOp->getValueType(0);
unsigned NumElems = VT.getVectorNumElements();
SmallVector<int, 8> MaskVec;
for (unsigned i = 0; i != NumElems; ++i) {
int idx = SVOp->getMaskElt(i);
if (idx < 0)
MaskVec.push_back(idx);
else if (idx < (int)NumElems)
MaskVec.push_back(idx + NumElems);
else
MaskVec.push_back(idx - NumElems);
}
return DAG.getVectorShuffle(VT, SVOp->getDebugLoc(), SVOp->getOperand(1),
SVOp->getOperand(0), &MaskVec[0]);
}
/// ShouldXformToMOVHLPS - Return true if the node should be transformed to
/// match movhlps. The lower half elements should come from upper half of
/// V1 (and in order), and the upper half elements should come from the upper
/// half of V2 (and in order).
static bool ShouldXformToMOVHLPS(ArrayRef<int> Mask, EVT VT) {
if (VT.getSizeInBits() != 128)
return false;
if (VT.getVectorNumElements() != 4)
return false;
for (unsigned i = 0, e = 2; i != e; ++i)
if (!isUndefOrEqual(Mask[i], i+2))
return false;
for (unsigned i = 2; i != 4; ++i)
if (!isUndefOrEqual(Mask[i], i+4))
return false;
return true;
}
/// isScalarLoadToVector - Returns true if the node is a scalar load that
/// is promoted to a vector. It also returns the LoadSDNode by reference if
/// required.
static bool isScalarLoadToVector(SDNode *N, LoadSDNode **LD = NULL) {
if (N->getOpcode() != ISD::SCALAR_TO_VECTOR)
return false;
N = N->getOperand(0).getNode();
if (!ISD::isNON_EXTLoad(N))
return false;
if (LD)
*LD = cast<LoadSDNode>(N);
return true;
}
// Test whether the given value is a vector value which will be legalized
// into a load.
static bool WillBeConstantPoolLoad(SDNode *N) {
if (N->getOpcode() != ISD::BUILD_VECTOR)
return false;
// Check for any non-constant elements.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
switch (N->getOperand(i).getNode()->getOpcode()) {
case ISD::UNDEF:
case ISD::ConstantFP:
case ISD::Constant:
break;
default:
return false;
}
// Vectors of all-zeros and all-ones are materialized with special
// instructions rather than being loaded.
return !ISD::isBuildVectorAllZeros(N) &&
!ISD::isBuildVectorAllOnes(N);
}
/// ShouldXformToMOVLP{S|D} - Return true if the node should be transformed to
/// match movlp{s|d}. The lower half elements should come from lower half of
/// V1 (and in order), and the upper half elements should come from the upper
/// half of V2 (and in order). And since V1 will become the source of the
/// MOVLP, it must be either a vector load or a scalar load to vector.
static bool ShouldXformToMOVLP(SDNode *V1, SDNode *V2,
ArrayRef<int> Mask, EVT VT) {
if (VT.getSizeInBits() != 128)
return false;
if (!ISD::isNON_EXTLoad(V1) && !isScalarLoadToVector(V1))
return false;
// Is V2 is a vector load, don't do this transformation. We will try to use
// load folding shufps op.
if (ISD::isNON_EXTLoad(V2) || WillBeConstantPoolLoad(V2))
return false;
unsigned NumElems = VT.getVectorNumElements();
if (NumElems != 2 && NumElems != 4)
return false;
for (unsigned i = 0, e = NumElems/2; i != e; ++i)
if (!isUndefOrEqual(Mask[i], i))
return false;
for (unsigned i = NumElems/2, e = NumElems; i != e; ++i)
if (!isUndefOrEqual(Mask[i], i+NumElems))
return false;
return true;
}
/// isSplatVector - Returns true if N is a BUILD_VECTOR node whose elements are
/// all the same.
static bool isSplatVector(SDNode *N) {
if (N->getOpcode() != ISD::BUILD_VECTOR)
return false;
SDValue SplatValue = N->getOperand(0);
for (unsigned i = 1, e = N->getNumOperands(); i != e; ++i)
if (N->getOperand(i) != SplatValue)
return false;
return true;
}
/// isZeroShuffle - Returns true if N is a VECTOR_SHUFFLE that can be resolved
/// to an zero vector.
/// FIXME: move to dag combiner / method on ShuffleVectorSDNode
static bool isZeroShuffle(ShuffleVectorSDNode *N) {
SDValue V1 = N->getOperand(0);
SDValue V2 = N->getOperand(1);
unsigned NumElems = N->getValueType(0).getVectorNumElements();
for (unsigned i = 0; i != NumElems; ++i) {
int Idx = N->getMaskElt(i);
if (Idx >= (int)NumElems) {
unsigned Opc = V2.getOpcode();
if (Opc == ISD::UNDEF || ISD::isBuildVectorAllZeros(V2.getNode()))
continue;
if (Opc != ISD::BUILD_VECTOR ||
!X86::isZeroNode(V2.getOperand(Idx-NumElems)))
return false;
} else if (Idx >= 0) {
unsigned Opc = V1.getOpcode();
if (Opc == ISD::UNDEF || ISD::isBuildVectorAllZeros(V1.getNode()))
continue;
if (Opc != ISD::BUILD_VECTOR ||
!X86::isZeroNode(V1.getOperand(Idx)))
return false;
}
}
return true;
}
/// getZeroVector - Returns a vector of specified type with all zero elements.
///
static SDValue getZeroVector(EVT VT, const X86Subtarget *Subtarget,
SelectionDAG &DAG, DebugLoc dl) {
assert(VT.isVector() && "Expected a vector type");
unsigned Size = VT.getSizeInBits();
// Always build SSE zero vectors as <4 x i32> bitcasted
// to their dest type. This ensures they get CSE'd.
SDValue Vec;
if (Size == 128) { // SSE
if (Subtarget->hasSSE2()) { // SSE2
SDValue Cst = DAG.getTargetConstant(0, MVT::i32);
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
} else { // SSE1
SDValue Cst = DAG.getTargetConstantFP(+0.0, MVT::f32);
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4f32, Cst, Cst, Cst, Cst);
}
} else if (Size == 256) { // AVX
if (Subtarget->hasAVX2()) { // AVX2
SDValue Cst = DAG.getTargetConstant(0, MVT::i32);
SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8i32, Ops, 8);
} else {
// 256-bit logic and arithmetic instructions in AVX are all
// floating-point, no support for integer ops. Emit fp zeroed vectors.
SDValue Cst = DAG.getTargetConstantFP(+0.0, MVT::f32);
SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8f32, Ops, 8);
}
} else
llvm_unreachable("Unexpected vector type");
return DAG.getNode(ISD::BITCAST, dl, VT, Vec);
}
/// getOnesVector - Returns a vector of specified type with all bits set.
/// Always build ones vectors as <4 x i32> or <8 x i32>. For 256-bit types with
/// no AVX2 supprt, use two <4 x i32> inserted in a <8 x i32> appropriately.
/// Then bitcast to their original type, ensuring they get CSE'd.
static SDValue getOnesVector(EVT VT, bool HasAVX2, SelectionDAG &DAG,
DebugLoc dl) {
assert(VT.isVector() && "Expected a vector type");
unsigned Size = VT.getSizeInBits();
SDValue Cst = DAG.getTargetConstant(~0U, MVT::i32);
SDValue Vec;
if (Size == 256) {
if (HasAVX2) { // AVX2
SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8i32, Ops, 8);
} else { // AVX
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
Vec = Concat128BitVectors(Vec, Vec, MVT::v8i32, 8, DAG, dl);
}
} else if (Size == 128) {
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
} else
llvm_unreachable("Unexpected vector type");
return DAG.getNode(ISD::BITCAST, dl, VT, Vec);
}
/// NormalizeMask - V2 is a splat, modify the mask (if needed) so all elements
/// that point to V2 points to its first element.
static void NormalizeMask(SmallVectorImpl<int> &Mask, unsigned NumElems) {
for (unsigned i = 0; i != NumElems; ++i) {
if (Mask[i] > (int)NumElems) {
Mask[i] = NumElems;
}
}
}
/// getMOVLMask - Returns a vector_shuffle mask for an movs{s|d}, movd
/// operation of specified width.
static SDValue getMOVL(SelectionDAG &DAG, DebugLoc dl, EVT VT, SDValue V1,
SDValue V2) {
unsigned NumElems = VT.getVectorNumElements();
SmallVector<int, 8> Mask;
Mask.push_back(NumElems);
for (unsigned i = 1; i != NumElems; ++i)
Mask.push_back(i);
return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
}
/// getUnpackl - Returns a vector_shuffle node for an unpackl operation.
static SDValue getUnpackl(SelectionDAG &DAG, DebugLoc dl, EVT VT, SDValue V1,
SDValue V2) {
unsigned NumElems = VT.getVectorNumElements();
SmallVector<int, 8> Mask;
for (unsigned i = 0, e = NumElems/2; i != e; ++i) {
Mask.push_back(i);
Mask.push_back(i + NumElems);
}
return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
}
/// getUnpackh - Returns a vector_shuffle node for an unpackh operation.
static SDValue getUnpackh(SelectionDAG &DAG, DebugLoc dl, EVT VT, SDValue V1,
SDValue V2) {
unsigned NumElems = VT.getVectorNumElements();
SmallVector<int, 8> Mask;
for (unsigned i = 0, Half = NumElems/2; i != Half; ++i) {
Mask.push_back(i + Half);
Mask.push_back(i + NumElems + Half);
}
return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
}
// PromoteSplati8i16 - All i16 and i8 vector types can't be used directly by
// a generic shuffle instruction because the target has no such instructions.
// Generate shuffles which repeat i16 and i8 several times until they can be
// represented by v4f32 and then be manipulated by target suported shuffles.
static SDValue PromoteSplati8i16(SDValue V, SelectionDAG &DAG, int &EltNo) {
EVT VT = V.getValueType();
int NumElems = VT.getVectorNumElements();
DebugLoc dl = V.getDebugLoc();
while (NumElems > 4) {
if (EltNo < NumElems/2) {
V = getUnpackl(DAG, dl, VT, V, V);
} else {
V = getUnpackh(DAG, dl, VT, V, V);
EltNo -= NumElems/2;
}
NumElems >>= 1;
}
return V;
}
/// getLegalSplat - Generate a legal splat with supported x86 shuffles
static SDValue getLegalSplat(SelectionDAG &DAG, SDValue V, int EltNo) {
EVT VT = V.getValueType();
DebugLoc dl = V.getDebugLoc();
unsigned Size = VT.getSizeInBits();
if (Size == 128) {
V = DAG.getNode(ISD::BITCAST, dl, MVT::v4f32, V);
int SplatMask[4] = { EltNo, EltNo, EltNo, EltNo };
V = DAG.getVectorShuffle(MVT::v4f32, dl, V, DAG.getUNDEF(MVT::v4f32),
&SplatMask[0]);
} else if (Size == 256) {
// To use VPERMILPS to splat scalars, the second half of indicies must
// refer to the higher part, which is a duplication of the lower one,
// because VPERMILPS can only handle in-lane permutations.
int SplatMask[8] = { EltNo, EltNo, EltNo, EltNo,
EltNo+4, EltNo+4, EltNo+4, EltNo+4 };
V = DAG.getNode(ISD::BITCAST, dl, MVT::v8f32, V);
V = DAG.getVectorShuffle(MVT::v8f32, dl, V, DAG.getUNDEF(MVT::v8f32),
&SplatMask[0]);
} else
llvm_unreachable("Vector size not supported");
return DAG.getNode(ISD::BITCAST, dl, VT, V);
}
/// PromoteSplat - Splat is promoted to target supported vector shuffles.
static SDValue PromoteSplat(ShuffleVectorSDNode *SV, SelectionDAG &DAG) {
EVT SrcVT = SV->getValueType(0);
SDValue V1 = SV->getOperand(0);
DebugLoc dl = SV->getDebugLoc();
int EltNo = SV->getSplatIndex();
int NumElems = SrcVT.getVectorNumElements();
unsigned Size = SrcVT.getSizeInBits();
assert(((Size == 128 && NumElems > 4) || Size == 256) &&
"Unknown how to promote splat for type");
// Extract the 128-bit part containing the splat element and update
// the splat element index when it refers to the higher register.
if (Size == 256) {
V1 = Extract128BitVector(V1, EltNo, DAG, dl);
if (EltNo >= NumElems/2)
EltNo -= NumElems/2;
}
// All i16 and i8 vector types can't be used directly by a generic shuffle
// instruction because the target has no such instruction. Generate shuffles
// which repeat i16 and i8 several times until they fit in i32, and then can
// be manipulated by target suported shuffles.
EVT EltVT = SrcVT.getVectorElementType();
if (EltVT == MVT::i8 || EltVT == MVT::i16)
V1 = PromoteSplati8i16(V1, DAG, EltNo);
// Recreate the 256-bit vector and place the same 128-bit vector
// into the low and high part. This is necessary because we want
// to use VPERM* to shuffle the vectors
if (Size == 256) {
V1 = DAG.getNode(ISD::CONCAT_VECTORS, dl, SrcVT, V1, V1);
}
return getLegalSplat(DAG, V1, EltNo);
}
/// getShuffleVectorZeroOrUndef - Return a vector_shuffle of the specified
/// vector of zero or undef vector. This produces a shuffle where the low
/// element of V2 is swizzled into the zero/undef vector, landing at element
/// Idx. This produces a shuffle mask like 4,1,2,3 (idx=0) or 0,1,2,4 (idx=3).
static SDValue getShuffleVectorZeroOrUndef(SDValue V2, unsigned Idx,
bool IsZero,
const X86Subtarget *Subtarget,
SelectionDAG &DAG) {
EVT VT = V2.getValueType();
SDValue V1 = IsZero
? getZeroVector(VT, Subtarget, DAG, V2.getDebugLoc()) : DAG.getUNDEF(VT);
unsigned NumElems = VT.getVectorNumElements();
SmallVector<int, 16> MaskVec;
for (unsigned i = 0; i != NumElems; ++i)
// If this is the insertion idx, put the low elt of V2 here.
MaskVec.push_back(i == Idx ? NumElems : i);
return DAG.getVectorShuffle(VT, V2.getDebugLoc(), V1, V2, &MaskVec[0]);
}
/// getTargetShuffleMask - Calculates the shuffle mask corresponding to the
/// target specific opcode. Returns true if the Mask could be calculated.
/// Sets IsUnary to true if only uses one source.
static bool getTargetShuffleMask(SDNode *N, EVT VT,
SmallVectorImpl<int> &Mask, bool &IsUnary) {
unsigned NumElems = VT.getVectorNumElements();
SDValue ImmN;
IsUnary = false;
switch(N->getOpcode()) {
case X86ISD::SHUFP:
ImmN = N->getOperand(N->getNumOperands()-1);
DecodeSHUFPMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
break;
case X86ISD::UNPCKH:
DecodeUNPCKHMask(VT, Mask);
break;
case X86ISD::UNPCKL:
DecodeUNPCKLMask(VT, Mask);
break;
case X86ISD::MOVHLPS:
DecodeMOVHLPSMask(NumElems, Mask);
break;
case X86ISD::MOVLHPS:
DecodeMOVLHPSMask(NumElems, Mask);
break;
case X86ISD::PSHUFD:
case X86ISD::VPERMILP:
ImmN = N->getOperand(N->getNumOperands()-1);
DecodePSHUFMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
IsUnary = true;
break;
case X86ISD::PSHUFHW:
ImmN = N->getOperand(N->getNumOperands()-1);
DecodePSHUFHWMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
IsUnary = true;
break;
case X86ISD::PSHUFLW:
ImmN = N->getOperand(N->getNumOperands()-1);
DecodePSHUFLWMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
IsUnary = true;
break;
case X86ISD::MOVSS:
case X86ISD::MOVSD: {
// The index 0 always comes from the first element of the second source,
// this is why MOVSS and MOVSD are used in the first place. The other
// elements come from the other positions of the first source vector
Mask.push_back(NumElems);
for (unsigned i = 1; i != NumElems; ++i) {
Mask.push_back(i);
}
break;
}
case X86ISD::VPERM2X128:
ImmN = N->getOperand(N->getNumOperands()-1);
DecodeVPERM2X128Mask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
if (Mask.empty()) return false;
break;
case X86ISD::MOVDDUP:
case X86ISD::MOVLHPD:
case X86ISD::MOVLPD:
case X86ISD::MOVLPS:
case X86ISD::MOVSHDUP:
case X86ISD::MOVSLDUP:
case X86ISD::PALIGN:
// Not yet implemented
return false;
default: llvm_unreachable("unknown target shuffle node");
}
return true;
}
/// getShuffleScalarElt - Returns the scalar element that will make up the ith
/// element of the result of the vector shuffle.
static SDValue getShuffleScalarElt(SDNode *N, unsigned Index, SelectionDAG &DAG,
unsigned Depth) {
if (Depth == 6)
return SDValue(); // Limit search depth.
SDValue V = SDValue(N, 0);
EVT VT = V.getValueType();
unsigned Opcode = V.getOpcode();
// Recurse into ISD::VECTOR_SHUFFLE node to find scalars.
if (const ShuffleVectorSDNode *SV = dyn_cast<ShuffleVectorSDNode>(N)) {
int Elt = SV->getMaskElt(Index);
if (Elt < 0)
return DAG.getUNDEF(VT.getVectorElementType());
unsigned NumElems = VT.getVectorNumElements();
SDValue NewV = (Elt < (int)NumElems) ? SV->getOperand(0)
: SV->getOperand(1);
return getShuffleScalarElt(NewV.getNode(), Elt % NumElems, DAG, Depth+1);
}
// Recurse into target specific vector shuffles to find scalars.
if (isTargetShuffle(Opcode)) {
unsigned NumElems = VT.getVectorNumElements();
SmallVector<int, 16> ShuffleMask;
SDValue ImmN;
bool IsUnary;
if (!getTargetShuffleMask(N, VT, ShuffleMask, IsUnary))
return SDValue();
int Elt = ShuffleMask[Index];
if (Elt < 0)
return DAG.getUNDEF(VT.getVectorElementType());
SDValue NewV = (Elt < (int)NumElems) ? N->getOperand(0)
: N->getOperand(1);
return getShuffleScalarElt(NewV.getNode(), Elt % NumElems, DAG,
Depth+1);
}
// Actual nodes that may contain scalar elements
if (Opcode == ISD::BITCAST) {
V = V.getOperand(0);
EVT SrcVT = V.getValueType();
unsigned NumElems = VT.getVectorNumElements();
if (!SrcVT.isVector() || SrcVT.getVectorNumElements() != NumElems)
return SDValue();
}
if (V.getOpcode() == ISD::SCALAR_TO_VECTOR)
return (Index == 0) ? V.getOperand(0)
: DAG.getUNDEF(VT.getVectorElementType());
if (V.getOpcode() == ISD::BUILD_VECTOR)
return V.getOperand(Index);
return SDValue();
}
/// getNumOfConsecutiveZeros - Return the number of elements of a vector
/// shuffle operation which come from a consecutively from a zero. The
/// search can start in two different directions, from left or right.
static
unsigned getNumOfConsecutiveZeros(ShuffleVectorSDNode *SVOp, unsigned NumElems,
bool ZerosFromLeft, SelectionDAG &DAG) {
unsigned i;
for (i = 0; i != NumElems; ++i) {
unsigned Index = ZerosFromLeft ? i : NumElems-i-1;
SDValue Elt = getShuffleScalarElt(SVOp, Index, DAG, 0);
if (!(Elt.getNode() &&
(Elt.getOpcode() == ISD::UNDEF || X86::isZeroNode(Elt))))
break;
}
return i;
}
/// isShuffleMaskConsecutive - Check if the shuffle mask indicies [MaskI, MaskE)
/// correspond consecutively to elements from one of the vector operands,
/// starting from its index OpIdx. Also tell OpNum which source vector operand.
static
bool isShuffleMaskConsecutive(ShuffleVectorSDNode *SVOp,
unsigned MaskI, unsigned MaskE, unsigned OpIdx,
unsigned NumElems, unsigned &OpNum) {
bool SeenV1 = false;
bool SeenV2 = false;
for (unsigned i = MaskI; i != MaskE; ++i, ++OpIdx) {
int Idx = SVOp->getMaskElt(i);
// Ignore undef indicies
if (Idx < 0)
continue;
if (Idx < (int)NumElems)
SeenV1 = true;
else
SeenV2 = true;
// Only accept consecutive elements from the same vector
if ((Idx % NumElems != OpIdx) || (SeenV1 && SeenV2))
return false;
}
OpNum = SeenV1 ? 0 : 1;
return true;
}
/// isVectorShiftRight - Returns true if the shuffle can be implemented as a
/// logical left shift of a vector.
static bool isVectorShiftRight(ShuffleVectorSDNode *SVOp, SelectionDAG &DAG,
bool &isLeft, SDValue &ShVal, unsigned &ShAmt) {
unsigned NumElems = SVOp->getValueType(0).getVectorNumElements();
unsigned NumZeros = getNumOfConsecutiveZeros(SVOp, NumElems,
false /* check zeros from right */, DAG);
unsigned OpSrc;
if (!NumZeros)
return false;
// Considering the elements in the mask that are not consecutive zeros,
// check if they consecutively come from only one of the source vectors.
//
// V1 = {X, A, B, C} 0
// \ \ \ /
// vector_shuffle V1, V2 <1, 2, 3, X>
//
if (!isShuffleMaskConsecutive(SVOp,
0, // Mask Start Index
NumElems-NumZeros, // Mask End Index(exclusive)
NumZeros, // Where to start looking in the src vector
NumElems, // Number of elements in vector
OpSrc)) // Which source operand ?
return false;
isLeft = false;
ShAmt = NumZeros;
ShVal = SVOp->getOperand(OpSrc);
return true;
}
/// isVectorShiftLeft - Returns true if the shuffle can be implemented as a
/// logical left shift of a vector.
static bool isVectorShiftLeft(ShuffleVectorSDNode *SVOp, SelectionDAG &DAG,
bool &isLeft, SDValue &ShVal, unsigned &ShAmt) {
unsigned NumElems = SVOp->getValueType(0).getVectorNumElements();
unsigned NumZeros = getNumOfConsecutiveZeros(SVOp, NumElems,
true /* check zeros from left */, DAG);
unsigned OpSrc;
if (!NumZeros)
return false;
// Considering the elements in the mask that are not consecutive zeros,
// check if they consecutively come from only one of the source vectors.
//
// 0 { A, B, X, X } = V2
// / \ / /
// vector_shuffle V1, V2 <X, X, 4, 5>
//
if (!isShuffleMaskConsecutive(SVOp,
NumZeros, // Mask Start Index
NumElems, // Mask End Index(exclusive)
0, // Where to start looking in the src vector
NumElems, // Number of elements in vector
OpSrc)) // Which source operand ?
return false;
isLeft = true;
ShAmt = NumZeros;
ShVal = SVOp->getOperand(OpSrc);
return true;
}
/// isVectorShift - Returns true if the shuffle can be implemented as a
/// logical left or right shift of a vector.
static bool isVectorShift(ShuffleVectorSDNode *SVOp, SelectionDAG &DAG,
bool &isLeft, SDValue &ShVal, unsigned &ShAmt) {
// Although the logic below support any bitwidth size, there are no
// shift instructions which handle more than 128-bit vectors.
if (SVOp->getValueType(0).getSizeInBits() > 128)
return false;
if (isVectorShiftLeft(SVOp, DAG, isLeft, ShVal, ShAmt) ||
isVectorShiftRight(SVOp, DAG, isLeft, ShVal, ShAmt))
return true;
return false;
}
/// LowerBuildVectorv16i8 - Custom lower build_vector of v16i8.
///
static SDValue LowerBuildVectorv16i8(SDValue Op, unsigned NonZeros,
unsigned NumNonZero, unsigned NumZero,
SelectionDAG &DAG,
const X86Subtarget* Subtarget,
const TargetLowering &TLI) {
if (NumNonZero > 8)
return SDValue();
DebugLoc dl = Op.getDebugLoc();
SDValue V(0, 0);
bool First = true;
for (unsigned i = 0; i < 16; ++i) {
bool ThisIsNonZero = (NonZeros & (1 << i)) != 0;
if (ThisIsNonZero && First) {
if (NumZero)
V = getZeroVector(MVT::v8i16, Subtarget, DAG, dl);
else
V = DAG.getUNDEF(MVT::v8i16);
First = false;
}
if ((i & 1) != 0) {
SDValue ThisElt(0, 0), LastElt(0, 0);
bool LastIsNonZero = (NonZeros & (1 << (i-1))) != 0;
if (LastIsNonZero) {
LastElt = DAG.getNode(ISD::ZERO_EXTEND, dl,
MVT::i16, Op.getOperand(i-1));
}
if (ThisIsNonZero) {
ThisElt = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i16, Op.getOperand(i));
ThisElt = DAG.getNode(ISD::SHL, dl, MVT::i16,
ThisElt, DAG.getConstant(8, MVT::i8));
if (LastIsNonZero)
ThisElt = DAG.getNode(ISD::OR, dl, MVT::i16, ThisElt, LastElt);
} else
ThisElt = LastElt;
if (ThisElt.getNode())
V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v8i16, V, ThisElt,
DAG.getIntPtrConstant(i/2));
}
}
return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, V);
}
/// LowerBuildVectorv8i16 - Custom lower build_vector of v8i16.
///
static SDValue LowerBuildVectorv8i16(SDValue Op, unsigned NonZeros,
unsigned NumNonZero, unsigned NumZero,
SelectionDAG &DAG,
const X86Subtarget* Subtarget,
const TargetLowering &TLI) {
if (NumNonZero > 4)
return SDValue();
DebugLoc dl = Op.getDebugLoc();
SDValue V(0, 0);
bool First = true;
for (unsigned i = 0; i < 8; ++i) {
bool isNonZero = (NonZeros & (1 << i)) != 0;
if (isNonZero) {
if (First) {
if (NumZero)
V = getZeroVector(MVT::v8i16, Subtarget, DAG, dl);
else
V = DAG.getUNDEF(MVT::v8i16);
First = false;
}
V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl,
MVT::v8i16, V, Op.getOperand(i),
DAG.getIntPtrConstant(i));
}
}
return V;
}
/// getVShift - Return a vector logical shift node.
///
static SDValue getVShift(bool isLeft, EVT VT, SDValue SrcOp,
unsigned NumBits, SelectionDAG &DAG,
const TargetLowering &TLI, DebugLoc dl) {
assert(VT.getSizeInBits() == 128 && "Unknown type for VShift");
EVT ShVT = MVT::v2i64;
unsigned Opc = isLeft ? X86ISD::VSHLDQ : X86ISD::VSRLDQ;
SrcOp = DAG.getNode(ISD::BITCAST, dl, ShVT, SrcOp);
return DAG.getNode(ISD::BITCAST, dl, VT,
DAG.getNode(Opc, dl, ShVT, SrcOp,
DAG.getConstant(NumBits,
TLI.getShiftAmountTy(SrcOp.getValueType()))));
}
SDValue
X86TargetLowering::LowerAsSplatVectorLoad(SDValue SrcOp, EVT VT, DebugLoc dl,
SelectionDAG &DAG) const {
// Check if the scalar load can be widened into a vector load. And if
// the address is "base + cst" see if the cst can be "absorbed" into
// the shuffle mask.
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(SrcOp)) {
SDValue Ptr = LD->getBasePtr();
if (!ISD::isNormalLoad(LD) || LD->isVolatile())
return SDValue();
EVT PVT = LD->getValueType(0);
if (PVT != MVT::i32 && PVT != MVT::f32)
return SDValue();
int FI = -1;
int64_t Offset = 0;
if (FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr)) {
FI = FINode->getIndex();
Offset = 0;
} else if (DAG.isBaseWithConstantOffset(Ptr) &&
isa<FrameIndexSDNode>(Ptr.getOperand(0))) {
FI = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
Offset = Ptr.getConstantOperandVal(1);
Ptr = Ptr.getOperand(0);
} else {
return SDValue();
}
// FIXME: 256-bit vector instructions don't require a strict alignment,
// improve this code to support it better.
unsigned RequiredAlign = VT.getSizeInBits()/8;
SDValue Chain = LD->getChain();
// Make sure the stack object alignment is at least 16 or 32.
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
if (DAG.InferPtrAlignment(Ptr) < RequiredAlign) {
if (MFI->isFixedObjectIndex(FI)) {
// Can't change the alignment. FIXME: It's possible to compute
// the exact stack offset and reference FI + adjust offset instead.
// If someone *really* cares about this. That's the way to implement it.
return SDValue();
} else {
MFI->setObjectAlignment(FI, RequiredAlign);
}
}
// (Offset % 16 or 32) must be multiple of 4. Then address is then
// Ptr + (Offset & ~15).
if (Offset < 0)
return SDValue();
if ((Offset % RequiredAlign) & 3)
return SDValue();
int64_t StartOffset = Offset & ~(RequiredAlign-1);
if (StartOffset)
Ptr = DAG.getNode(ISD::ADD, Ptr.getDebugLoc(), Ptr.getValueType(),
Ptr,DAG.getConstant(StartOffset, Ptr.getValueType()));
int EltNo = (Offset - StartOffset) >> 2;
unsigned NumElems = VT.getVectorNumElements();
EVT NVT = EVT::getVectorVT(*DAG.getContext(), PVT, NumElems);
SDValue V1 = DAG.getLoad(NVT, dl, Chain, Ptr,
LD->getPointerInfo().getWithOffset(StartOffset),
false, false, false, 0);
SmallVector<int, 8> Mask;
for (unsigned i = 0; i != NumElems; ++i)
Mask.push_back(EltNo);
return DAG.getVectorShuffle(NVT, dl, V1, DAG.getUNDEF(NVT), &Mask[0]);
}
return SDValue();
}
/// EltsFromConsecutiveLoads - Given the initializing elements 'Elts' of a
/// vector of type 'VT', see if the elements can be replaced by a single large
/// load which has the same value as a build_vector whose operands are 'elts'.
///
/// Example: <load i32 *a, load i32 *a+4, undef, undef> -> zextload a
///
/// FIXME: we'd also like to handle the case where the last elements are zero
/// rather than undef via VZEXT_LOAD, but we do not detect that case today.
/// There's even a handy isZeroNode for that purpose.
static SDValue EltsFromConsecutiveLoads(EVT VT, SmallVectorImpl<SDValue> &Elts,
DebugLoc &DL, SelectionDAG &DAG) {
EVT EltVT = VT.getVectorElementType();
unsigned NumElems = Elts.size();
LoadSDNode *LDBase = NULL;
unsigned LastLoadedElt = -1U;
// For each element in the initializer, see if we've found a load or an undef.
// If we don't find an initial load element, or later load elements are
// non-consecutive, bail out.
for (unsigned i = 0; i < NumElems; ++i) {
SDValue Elt = Elts[i];
if (!Elt.getNode() ||
(Elt.getOpcode() != ISD::UNDEF && !ISD::isNON_EXTLoad(Elt.getNode())))
return SDValue();
if (!LDBase) {
if (Elt.getNode()->getOpcode() == ISD::UNDEF)
return SDValue();
LDBase = cast<LoadSDNode>(Elt.getNode());
LastLoadedElt = i;
continue;
}
if (Elt.getOpcode() == ISD::UNDEF)
continue;
LoadSDNode *LD = cast<LoadSDNode>(Elt);
if (!DAG.isConsecutiveLoad(LD, LDBase, EltVT.getSizeInBits()/8, i))
return SDValue();
LastLoadedElt = i;
}
// If we have found an entire vector of loads and undefs, then return a large
// load of the entire vector width starting at the base pointer. If we found
// consecutive loads for the low half, generate a vzext_load node.
if (LastLoadedElt == NumElems - 1) {
if (DAG.InferPtrAlignment(LDBase->getBasePtr()) >= 16)
return DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
LDBase->getPointerInfo(),
LDBase->isVolatile(), LDBase->isNonTemporal(),
LDBase->isInvariant(), 0);
return DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
LDBase->getPointerInfo(),
LDBase->isVolatile(), LDBase->isNonTemporal(),
LDBase->isInvariant(), LDBase->getAlignment());
}
if (NumElems == 4 && LastLoadedElt == 1 &&
DAG.getTargetLoweringInfo().isTypeLegal(MVT::v2i64)) {
SDVTList Tys = DAG.getVTList(MVT::v2i64, MVT::Other);
SDValue Ops[] = { LDBase->getChain(), LDBase->getBasePtr() };
SDValue ResNode =
DAG.getMemIntrinsicNode(X86ISD::VZEXT_LOAD, DL, Tys, Ops, 2, MVT::i64,
LDBase->getPointerInfo(),
LDBase->getAlignment(),
false/*isVolatile*/, true/*ReadMem*/,
false/*WriteMem*/);
return DAG.getNode(ISD::BITCAST, DL, VT, ResNode);
}
return SDValue();
}
/// LowerVectorBroadcast - Attempt to use the vbroadcast instruction
/// to generate a splat value for the following cases:
/// 1. A splat BUILD_VECTOR which uses a single scalar load, or a constant.
/// 2. A splat shuffle which uses a scalar_to_vector node which comes from
/// a scalar load, or a constant.
/// The VBROADCAST node is returned when a pattern is found,
/// or SDValue() otherwise.
SDValue
X86TargetLowering::LowerVectorBroadcast(SDValue &Op, SelectionDAG &DAG) const {
if (!Subtarget->hasAVX())
return SDValue();
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
SDValue Ld;
bool ConstSplatVal;
switch (Op.getOpcode()) {
default:
// Unknown pattern found.
return SDValue();
case ISD::BUILD_VECTOR: {
// The BUILD_VECTOR node must be a splat.
if (!isSplatVector(Op.getNode()))
return SDValue();
Ld = Op.getOperand(0);
ConstSplatVal = (Ld.getOpcode() == ISD::Constant ||
Ld.getOpcode() == ISD::ConstantFP);
// The suspected load node has several users. Make sure that all
// of its users are from the BUILD_VECTOR node.
// Constants may have multiple users.
if (!ConstSplatVal && !Ld->hasNUsesOfValue(VT.getVectorNumElements(), 0))
return SDValue();
break;
}
case ISD::VECTOR_SHUFFLE: {
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
// Shuffles must have a splat mask where the first element is
// broadcasted.
if ((!SVOp->isSplat()) || SVOp->getMaskElt(0) != 0)
return SDValue();
SDValue Sc = Op.getOperand(0);
if (Sc.getOpcode() != ISD::SCALAR_TO_VECTOR)
return SDValue();
Ld = Sc.getOperand(0);
ConstSplatVal = (Ld.getOpcode() == ISD::Constant ||
Ld.getOpcode() == ISD::ConstantFP);
// The scalar_to_vector node and the suspected
// load node must have exactly one user.
// Constants may have multiple users.
if (!ConstSplatVal && (!Sc.hasOneUse() || !Ld.hasOneUse()))
return SDValue();
break;
}
}
bool Is256 = VT.getSizeInBits() == 256;
bool Is128 = VT.getSizeInBits() == 128;
// Handle the broadcasting a single constant scalar from the constant pool
// into a vector. On Sandybridge it is still better to load a constant vector
// from the constant pool and not to broadcast it from a scalar.
if (ConstSplatVal && Subtarget->hasAVX2()) {
EVT CVT = Ld.getValueType();
assert(!CVT.isVector() && "Must not broadcast a vector type");
unsigned ScalarSize = CVT.getSizeInBits();
if ((Is256 && (ScalarSize == 32 || ScalarSize == 64)) ||
(Is128 && (ScalarSize == 32))) {
const Constant *C = 0;
if (ConstantSDNode *CI = dyn_cast<ConstantSDNode>(Ld))
C = CI->getConstantIntValue();
else if (ConstantFPSDNode *CF = dyn_cast<ConstantFPSDNode>(Ld))
C = CF->getConstantFPValue();
assert(C && "Invalid constant type");
SDValue CP = DAG.getConstantPool(C, getPointerTy());
unsigned Alignment = cast<ConstantPoolSDNode>(CP)->getAlignment();
Ld = DAG.getLoad(CVT, dl, DAG.getEntryNode(), CP,
MachinePointerInfo::getConstantPool(),
false, false, false, Alignment);
return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
}
}
// The scalar source must be a normal load.
if (!ISD::isNormalLoad(Ld.getNode()))
return SDValue();
// Reject loads that have uses of the chain result
if (Ld->hasAnyUseOfValue(1))
return SDValue();
unsigned ScalarSize = Ld.getValueType().getSizeInBits();
// VBroadcast to YMM
if (Is256 && (ScalarSize == 32 || ScalarSize == 64))
return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
// VBroadcast to XMM
if (Is128 && (ScalarSize == 32))
return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
// The integer check is needed for the 64-bit into 128-bit so it doesn't match
// double since there is vbroadcastsd xmm
if (Subtarget->hasAVX2() && Ld.getValueType().isInteger()) {
// VBroadcast to YMM
if (Is256 && (ScalarSize == 8 || ScalarSize == 16))
return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
// VBroadcast to XMM
if (Is128 && (ScalarSize == 8 || ScalarSize == 16 || ScalarSize == 64))
return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
}
// Unsupported broadcast.
return SDValue();
}
SDValue
X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
EVT VT = Op.getValueType();
EVT ExtVT = VT.getVectorElementType();
unsigned NumElems = Op.getNumOperands();
// Vectors containing all zeros can be matched by pxor and xorps later
if (ISD::isBuildVectorAllZeros(Op.getNode())) {
// Canonicalize this to <4 x i32> to 1) ensure the zero vectors are CSE'd
// and 2) ensure that i64 scalars are eliminated on x86-32 hosts.
if (VT == MVT::v4i32 || VT == MVT::v8i32)
return Op;
return getZeroVector(VT, Subtarget, DAG, dl);
}
// Vectors containing all ones can be matched by pcmpeqd on 128-bit width
// vectors or broken into v4i32 operations on 256-bit vectors. AVX2 can use
// vpcmpeqd on 256-bit vectors.
if (ISD::isBuildVectorAllOnes(Op.getNode())) {
if (VT == MVT::v4i32 || (VT == MVT::v8i32 && Subtarget->hasAVX2()))
return Op;
return getOnesVector(VT, Subtarget->hasAVX2(), DAG, dl);
}
SDValue Broadcast = LowerVectorBroadcast(Op, DAG);
if (Broadcast.getNode())
return Broadcast;
unsigned EVTBits = ExtVT.getSizeInBits();
unsigned NumZero = 0;
unsigned NumNonZero = 0;
unsigned NonZeros = 0;
bool IsAllConstants = true;
SmallSet<SDValue, 8> Values;
for (unsigned i = 0; i < NumElems; ++i) {
SDValue Elt = Op.getOperand(i);
if (Elt.getOpcode() == ISD::UNDEF)
continue;
Values.insert(Elt);
if (Elt.getOpcode() != ISD::Constant &&
Elt.getOpcode() != ISD::ConstantFP)
IsAllConstants = false;
if (X86::isZeroNode(Elt))
NumZero++;
else {
NonZeros |= (1 << i);
NumNonZero++;
}
}
// All undef vector. Return an UNDEF. All zero vectors were handled above.
if (NumNonZero == 0)
return DAG.getUNDEF(VT);
// Special case for single non-zero, non-undef, element.
if (NumNonZero == 1) {
unsigned Idx = CountTrailingZeros_32(NonZeros);
SDValue Item = Op.getOperand(Idx);
// If this is an insertion of an i64 value on x86-32, and if the top bits of
// the value are obviously zero, truncate the value to i32 and do the
// insertion that way. Only do this if the value is non-constant or if the
// value is a constant being inserted into element 0. It is cheaper to do
// a constant pool load than it is to do a movd + shuffle.
if (ExtVT == MVT::i64 && !Subtarget->is64Bit() &&
(!IsAllConstants || Idx == 0)) {
if (DAG.MaskedValueIsZero(Item, APInt::getBitsSet(64, 32, 64))) {
// Handle SSE only.
assert(VT == MVT::v2i64 && "Expected an SSE value type!");
EVT VecVT = MVT::v4i32;
unsigned VecElts = 4;
// Truncate the value (which may itself be a constant) to i32, and
// convert it to a vector with movd (S2V+shuffle to zero extend).
Item = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Item);
Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VecVT, Item);
Item = getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
// Now we have our 32-bit value zero extended in the low element of
// a vector. If Idx != 0, swizzle it into place.
if (Idx != 0) {
SmallVector<int, 4> Mask;
Mask.push_back(Idx);
for (unsigned i = 1; i != VecElts; ++i)
Mask.push_back(i);
Item = DAG.getVectorShuffle(VecVT, dl, Item, DAG.getUNDEF(VecVT),
&Mask[0]);
}
return DAG.getNode(ISD::BITCAST, dl, VT, Item);
}
}
// If we have a constant or non-constant insertion into the low element of
// a vector, we can do this with SCALAR_TO_VECTOR + shuffle of zero into
// the rest of the elements. This will be matched as movd/movq/movss/movsd
// depending on what the source datatype is.
if (Idx == 0) {
if (NumZero == 0)
return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
if (ExtVT == MVT::i32 || ExtVT == MVT::f32 || ExtVT == MVT::f64 ||
(ExtVT == MVT::i64 && Subtarget->is64Bit())) {
if (VT.getSizeInBits() == 256) {
SDValue ZeroVec = getZeroVector(VT, Subtarget, DAG, dl);
return DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, ZeroVec,
Item, DAG.getIntPtrConstant(0));
}
assert(VT.getSizeInBits() == 128 && "Expected an SSE value type!");
Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
// Turn it into a MOVL (i.e. movss, movsd, or movd) to a zero vector.
return getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
}
if (ExtVT == MVT::i16 || ExtVT == MVT::i8) {
Item = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Item);
Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32, Item);
if (VT.getSizeInBits() == 256) {
SDValue ZeroVec = getZeroVector(MVT::v8i32, Subtarget, DAG, dl);
Item = Insert128BitVector(ZeroVec, Item, 0, DAG, dl);
} else {
assert(VT.getSizeInBits() == 128 && "Expected an SSE value type!");
Item = getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
}
return DAG.getNode(ISD::BITCAST, dl, VT, Item);
}
}
// Is it a vector logical left shift?
if (NumElems == 2 && Idx == 1 &&
X86::isZeroNode(Op.getOperand(0)) &&
!X86::isZeroNode(Op.getOperand(1))) {
unsigned NumBits = VT.getSizeInBits();
return getVShift(true, VT,
DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
VT, Op.getOperand(1)),
NumBits/2, DAG, *this, dl);
}
if (IsAllConstants) // Otherwise, it's better to do a constpool load.
return SDValue();
// Otherwise, if this is a vector with i32 or f32 elements, and the element
// is a non-constant being inserted into an element other than the low one,
// we can't use a constant pool load. Instead, use SCALAR_TO_VECTOR (aka
// movd/movss) to move this into the low element, then shuffle it into
// place.
if (EVTBits == 32) {
Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
// Turn it into a shuffle of zero and zero-extended scalar to vector.
Item = getShuffleVectorZeroOrUndef(Item, 0, NumZero > 0, Subtarget, DAG);
SmallVector<int, 8> MaskVec;
for (unsigned i = 0; i < NumElems; i++)
MaskVec.push_back(i == Idx ? 0 : 1);
return DAG.getVectorShuffle(VT, dl, Item, DAG.getUNDEF(VT), &MaskVec[0]);
}
}
// Splat is obviously ok. Let legalizer expand it to a shuffle.
if (Values.size() == 1) {
if (EVTBits == 32) {
// Instead of a shuffle like this:
// shuffle (scalar_to_vector (load (ptr + 4))), undef, <0, 0, 0, 0>
// Check if it's possible to issue this instead.
// shuffle (vload ptr)), undef, <1, 1, 1, 1>
unsigned Idx = CountTrailingZeros_32(NonZeros);
SDValue Item = Op.getOperand(Idx);
if (Op.getNode()->isOnlyUserOf(Item.getNode()))
return LowerAsSplatVectorLoad(Item, VT, dl, DAG);
}
return SDValue();
}
// A vector full of immediates; various special cases are already
// handled, so this is best done with a single constant-pool load.
if (IsAllConstants)
return SDValue();
// For AVX-length vectors, build the individual 128-bit pieces and use
// shuffles to put them in place.
if (VT.getSizeInBits() == 256) {
SmallVector<SDValue, 32> V;
for (unsigned i = 0; i != NumElems; ++i)
V.push_back(Op.getOperand(i));
EVT HVT = EVT::getVectorVT(*DAG.getContext(), ExtVT, NumElems/2);
// Build both the lower and upper subvector.
SDValue Lower = DAG.getNode(ISD::BUILD_VECTOR, dl, HVT, &V[0], NumElems/2);
SDValue Upper = DAG.getNode(ISD::BUILD_VECTOR, dl, HVT, &V[NumElems / 2],
NumElems/2);
// Recreate the wider vector with the lower and upper part.
return Concat128BitVectors(Lower, Upper, VT, NumElems, DAG, dl);
}
// Let legalizer expand 2-wide build_vectors.
if (EVTBits == 64) {
if (NumNonZero == 1) {
// One half is zero or undef.
unsigned Idx = CountTrailingZeros_32(NonZeros);
SDValue V2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT,
Op.getOperand(Idx));
return getShuffleVectorZeroOrUndef(V2, Idx, true, Subtarget, DAG);
}
return SDValue();
}
// If element VT is < 32 bits, convert it to inserts into a zero vector.
if (EVTBits == 8 && NumElems == 16) {
SDValue V = LowerBuildVectorv16i8(Op, NonZeros,NumNonZero,NumZero, DAG,
Subtarget, *this);
if (V.getNode()) return V;
}
if (EVTBits == 16 && NumElems == 8) {
SDValue V = LowerBuildVectorv8i16(Op, NonZeros,NumNonZero,NumZero, DAG,
Subtarget, *this);
if (V.getNode()) return V;
}
// If element VT is == 32 bits, turn it into a number of shuffles.
SmallVector<SDValue, 8> V(NumElems);
if (NumElems == 4 && NumZero > 0) {
for (unsigned i = 0; i < 4; ++i) {
bool isZero = !(NonZeros & (1 << i));
if (isZero)
V[i] = getZeroVector(VT, Subtarget, DAG, dl);
else
V[i] = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(i));
}
for (unsigned i = 0; i < 2; ++i) {
switch ((NonZeros & (0x3 << i*2)) >> (i*2)) {
default: break;
case 0:
V[i] = V[i*2]; // Must be a zero vector.
break;
case 1:
V[i] = getMOVL(DAG, dl, VT, V[i*2+1], V[i*2]);
break;
case 2:
V[i] = getMOVL(DAG, dl, VT, V[i*2], V[i*2+1]);
break;
case 3:
V[i] = getUnpackl(DAG, dl, VT, V[i*2], V[i*2+1]);
break;
}
}
bool Reverse1 = (NonZeros & 0x3) == 2;
bool Reverse2 = ((NonZeros & (0x3 << 2)) >> 2) == 2;
int MaskVec[] = {
Reverse1 ? 1 : 0,
Reverse1 ? 0 : 1,
static_cast<int>(Reverse2 ? NumElems+1 : NumElems),
static_cast<int>(Reverse2 ? NumElems : NumElems+1)
};
return DAG.getVectorShuffle(VT, dl, V[0], V[1], &MaskVec[0]);
}
if (Values.size() > 1 && VT.getSizeInBits() == 128) {
// Check for a build vector of consecutive loads.
for (unsigned i = 0; i < NumElems; ++i)
V[i] = Op.getOperand(i);
// Check for elements which are consecutive loads.
SDValue LD = EltsFromConsecutiveLoads(VT, V, dl, DAG);
if (LD.getNode())
return LD;
// For SSE 4.1, use insertps to put the high elements into the low element.
if (getSubtarget()->hasSSE41()) {
SDValue Result;
if (Op.getOperand(0).getOpcode() != ISD::UNDEF)
Result = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(0));
else
Result = DAG.getUNDEF(VT);
for (unsigned i = 1; i < NumElems; ++i) {
if (Op.getOperand(i).getOpcode() == ISD::UNDEF) continue;
Result = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Result,
Op.getOperand(i), DAG.getIntPtrConstant(i));
}
return Result;
}
// Otherwise, expand into a number of unpckl*, start by extending each of
// our (non-undef) elements to the full vector width with the element in the
// bottom slot of the vector (which generates no code for SSE).
for (unsigned i = 0; i < NumElems; ++i) {
if (Op.getOperand(i).getOpcode() != ISD::UNDEF)
V[i] = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(i));
else
V[i] = DAG.getUNDEF(VT);
}
// Next, we iteratively mix elements, e.g. for v4f32:
// Step 1: unpcklps 0, 2 ==> X: <?, ?, 2, 0>
// : unpcklps 1, 3 ==> Y: <?, ?, 3, 1>
// Step 2: unpcklps X, Y ==> <3, 2, 1, 0>
unsigned EltStride = NumElems >> 1;
while (EltStride != 0) {
for (unsigned i = 0; i < EltStride; ++i) {
// If V[i+EltStride] is undef and this is the first round of mixing,
// then it is safe to just drop this shuffle: V[i] is already in the
// right place, the one element (since it's the first round) being
// inserted as undef can be dropped. This isn't safe for successive
// rounds because they will permute elements within both vectors.
if (V[i+EltStride].getOpcode() == ISD::UNDEF &&
EltStride == NumElems/2)
continue;
V[i] = getUnpackl(DAG, dl, VT, V[i], V[i + EltStride]);
}
EltStride >>= 1;
}
return V[0];
}
return SDValue();
}
// LowerMMXCONCAT_VECTORS - We support concatenate two MMX registers and place
// them in a MMX register. This is better than doing a stack convert.
static SDValue LowerMMXCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
DebugLoc dl = Op.getDebugLoc();
EVT ResVT = Op.getValueType();
assert(ResVT == MVT::v2i64 || ResVT == MVT::v4i32 ||
ResVT == MVT::v8i16 || ResVT == MVT::v16i8);
int Mask[2];
SDValue InVec = DAG.getNode(ISD::BITCAST,dl, MVT::v1i64, Op.getOperand(0));
SDValue VecOp = DAG.getNode(X86ISD::MOVQ2DQ, dl, MVT::v2i64, InVec);
InVec = Op.getOperand(1);
if (InVec.getOpcode() == ISD::SCALAR_TO_VECTOR) {
unsigned NumElts = ResVT.getVectorNumElements();
VecOp = DAG.getNode(ISD::BITCAST, dl, ResVT, VecOp);
VecOp = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, ResVT, VecOp,
InVec.getOperand(0), DAG.getIntPtrConstant(NumElts/2+1));
} else {
InVec = DAG.getNode(ISD::BITCAST, dl, MVT::v1i64, InVec);
SDValue VecOp2 = DAG.getNode(X86ISD::MOVQ2DQ, dl, MVT::v2i64, InVec);
Mask[0] = 0; Mask[1] = 2;
VecOp = DAG.getVectorShuffle(MVT::v2i64, dl, VecOp, VecOp2, Mask);
}
return DAG.getNode(ISD::BITCAST, dl, ResVT, VecOp);
}
// LowerAVXCONCAT_VECTORS - 256-bit AVX can use the vinsertf128 instruction
// to create 256-bit vectors from two other 128-bit ones.
static SDValue LowerAVXCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
DebugLoc dl = Op.getDebugLoc();
EVT ResVT = Op.getValueType();
assert(ResVT.getSizeInBits() == 256 && "Value type must be 256-bit wide");
SDValue V1 = Op.getOperand(0);
SDValue V2 = Op.getOperand(1);
unsigned NumElems = ResVT.getVectorNumElements();
return Concat128BitVectors(V1, V2, ResVT, NumElems, DAG, dl);
}
SDValue
X86TargetLowering::LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const {
EVT ResVT = Op.getValueType();
assert(Op.getNumOperands() == 2);
assert((ResVT.getSizeInBits() == 128 || ResVT.getSizeInBits() == 256) &&
"Unsupported CONCAT_VECTORS for value type");
// We support concatenate two MMX registers and place them in a MMX register.
// This is better than doing a stack convert.
if (ResVT.is128BitVector())
return LowerMMXCONCAT_VECTORS(Op, DAG);
// 256-bit AVX can use the vinsertf128 instruction to create 256-bit vectors
// from two other 128-bit ones.
return LowerAVXCONCAT_VECTORS(Op, DAG);
}
// Try to lower a shuffle node into a simple blend instruction.
static SDValue LowerVECTOR_SHUFFLEtoBlend(ShuffleVectorSDNode *SVOp,
const X86Subtarget *Subtarget,
SelectionDAG &DAG) {
SDValue V1 = SVOp->getOperand(0);
SDValue V2 = SVOp->getOperand(1);
DebugLoc dl = SVOp->getDebugLoc();
MVT VT = SVOp->getValueType(0).getSimpleVT();
unsigned NumElems = VT.getVectorNumElements();
if (!Subtarget->hasSSE41())
return SDValue();
unsigned ISDNo = 0;
MVT OpTy;
switch (VT.SimpleTy) {
default: return SDValue();
case MVT::v8i16:
ISDNo = X86ISD::BLENDPW;
OpTy = MVT::v8i16;
break;
case MVT::v4i32:
case MVT::v4f32:
ISDNo = X86ISD::BLENDPS;
OpTy = MVT::v4f32;
break;
case MVT::v2i64:
case MVT::v2f64:
ISDNo = X86ISD::BLENDPD;
OpTy = MVT::v2f64;
break;
case MVT::v8i32:
case MVT::v8f32:
if (!Subtarget->hasAVX())
return SDValue();
ISDNo = X86ISD::BLENDPS;
OpTy = MVT::v8f32;
break;
case MVT::v4i64:
case MVT::v4f64:
if (!Subtarget->hasAVX())
return SDValue();
ISDNo = X86ISD::BLENDPD;
OpTy = MVT::v4f64;
break;
}
assert(ISDNo && "Invalid Op Number");
unsigned MaskVals = 0;
for (unsigned i = 0; i != NumElems; ++i) {
int EltIdx = SVOp->getMaskElt(i);
if (EltIdx == (int)i || EltIdx < 0)
MaskVals |= (1<<i);
else if (EltIdx == (int)(i + NumElems))
continue; // Bit is set to zero;
else
return SDValue();
}
V1 = DAG.getNode(ISD::BITCAST, dl, OpTy, V1);
V2 = DAG.getNode(ISD::BITCAST, dl, OpTy, V2);
SDValue Ret = DAG.getNode(ISDNo, dl, OpTy, V1, V2,
DAG.getConstant(MaskVals, MVT::i32));
return DAG.getNode(ISD::BITCAST, dl, VT, Ret);
}
// v8i16 shuffles - Prefer shuffles in the following order:
// 1. [all] pshuflw, pshufhw, optional move
// 2. [ssse3] 1 x pshufb
// 3. [ssse3] 2 x pshufb + 1 x por
// 4. [all] mov + pshuflw + pshufhw + N x (pextrw + pinsrw)
SDValue
X86TargetLowering::LowerVECTOR_SHUFFLEv8i16(SDValue Op,
SelectionDAG &DAG) const {
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
SDValue V1 = SVOp->getOperand(0);
SDValue V2 = SVOp->getOperand(1);
DebugLoc dl = SVOp->getDebugLoc();
SmallVector<int, 8> MaskVals;
// Determine if more than 1 of the words in each of the low and high quadwords
// of the result come from the same quadword of one of the two inputs. Undef
// mask values count as coming from any quadword, for better codegen.
unsigned LoQuad[] = { 0, 0, 0, 0 };
unsigned HiQuad[] = { 0, 0, 0, 0 };
std::bitset<4> InputQuads;
for (unsigned i = 0; i < 8; ++i) {
unsigned *Quad = i < 4 ? LoQuad : HiQuad;
int EltIdx = SVOp->getMaskElt(i);
MaskVals.push_back(EltIdx);
if (EltIdx < 0) {
++Quad[0];
++Quad[1];
++Quad[2];
++Quad[3];
continue;
}
++Quad[EltIdx / 4];
InputQuads.set(EltIdx / 4);
}
int BestLoQuad = -1;
unsigned MaxQuad = 1;
for (unsigned i = 0; i < 4; ++i) {
if (LoQuad[i] > MaxQuad) {
BestLoQuad = i;
MaxQuad = LoQuad[i];
}
}
int BestHiQuad = -1;
MaxQuad = 1;
for (unsigned i = 0; i < 4; ++i) {
if (HiQuad[i] > MaxQuad) {
BestHiQuad = i;
MaxQuad = HiQuad[i];
}
}
// For SSSE3, If all 8 words of the result come from only 1 quadword of each
// of the two input vectors, shuffle them into one input vector so only a
// single pshufb instruction is necessary. If There are more than 2 input
// quads, disable the next transformation since it does not help SSSE3.
bool V1Used = InputQuads[0] || InputQuads[1];
bool V2Used = InputQuads[2] || InputQuads[3];
if (Subtarget->hasSSSE3()) {
if (InputQuads.count() == 2 && V1Used && V2Used) {
BestLoQuad = InputQuads[0] ? 0 : 1;
BestHiQuad = InputQuads[2] ? 2 : 3;
}
if (InputQuads.count() > 2) {
BestLoQuad = -1;
BestHiQuad = -1;
}
}
// If BestLoQuad or BestHiQuad are set, shuffle the quads together and update
// the shuffle mask. If a quad is scored as -1, that means that it contains
// words from all 4 input quadwords.
SDValue NewV;
if (BestLoQuad >= 0 || BestHiQuad >= 0) {
int MaskV[] = {
BestLoQuad < 0 ? 0 : BestLoQuad,
BestHiQuad < 0 ? 1 : BestHiQuad
};
NewV = DAG.getVectorShuffle(MVT::v2i64, dl,
DAG.getNode(ISD::BITCAST, dl, MVT::v2i64, V1),
DAG.getNode(ISD::BITCAST, dl, MVT::v2i64, V2), &MaskV[0]);
NewV = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, NewV);
// Rewrite the MaskVals and assign NewV to V1 if NewV now contains all the
// source words for the shuffle, to aid later transformations.
bool AllWordsInNewV = true;
bool InOrder[2] = { true, true };
for (unsigned i = 0; i != 8; ++i) {
int idx = MaskVals[i];
if (idx != (int)i)
InOrder[i/4] = false;
if (idx < 0 || (idx/4) == BestLoQuad || (idx/4) == BestHiQuad)
continue;
AllWordsInNewV = false;
break;
}
bool pshuflw = AllWordsInNewV, pshufhw = AllWordsInNewV;
if (AllWordsInNewV) {
for (int i = 0; i != 8; ++i) {
int idx = MaskVals[i];
if (idx < 0)
continue;
idx = MaskVals[i] = (idx / 4) == BestLoQuad ? (idx & 3) : (idx & 3) + 4;
if ((idx != i) && idx < 4)
pshufhw = false;
if ((idx != i) && idx > 3)
pshuflw = false;
}
V1 = NewV;
V2Used = false;
BestLoQuad = 0;
BestHiQuad = 1;
}
// If we've eliminated the use of V2, and the new mask is a pshuflw or
// pshufhw, that's as cheap as it gets. Return the new shuffle.
if ((pshufhw && InOrder[0]) || (pshuflw && InOrder[1])) {
unsigned Opc = pshufhw ? X86ISD::PSHUFHW : X86ISD::PSHUFLW;
unsigned TargetMask = 0;
NewV = DAG.getVectorShuffle(MVT::v8i16, dl, NewV,
DAG.getUNDEF(MVT::v8i16), &MaskVals[0]);
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(NewV.getNode());
TargetMask = pshufhw ? getShufflePSHUFHWImmediate(SVOp):
getShufflePSHUFLWImmediate(SVOp);
V1 = NewV.getOperand(0);
return getTargetShuffleNode(Opc, dl, MVT::v8i16, V1, TargetMask, DAG);
}
}
// If we have SSSE3, and all words of the result are from 1 input vector,
// case 2 is generated, otherwise case 3 is generated. If no SSSE3
// is present, fall back to case 4.
if (Subtarget->hasSSSE3()) {
SmallVector<SDValue,16> pshufbMask;
// If we have elements from both input vectors, set the high bit of the
// shuffle mask element to zero out elements that come from V2 in the V1
// mask, and elements that come from V1 in the V2 mask, so that the two
// results can be OR'd together.
bool TwoInputs = V1Used && V2Used;
for (unsigned i = 0; i != 8; ++i) {
int EltIdx = MaskVals[i] * 2;
if (TwoInputs && (EltIdx >= 16)) {
pshufbMask.push_back(DAG.getConstant(0x80, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0x80, MVT::i8));
continue;
}
pshufbMask.push_back(DAG.getConstant(EltIdx, MVT::i8));
pshufbMask.push_back(DAG.getConstant(EltIdx+1, MVT::i8));
}
V1 = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, V1);
V1 = DAG.getNode(X86ISD::PSHUFB, dl, MVT::v16i8, V1,
DAG.getNode(ISD::BUILD_VECTOR, dl,
MVT::v16i8, &pshufbMask[0], 16));
if (!TwoInputs)
return DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, V1);
// Calculate the shuffle mask for the second input, shuffle it, and
// OR it with the first shuffled input.
pshufbMask.clear();
for (unsigned i = 0; i != 8; ++i) {
int EltIdx = MaskVals[i] * 2;
if (EltIdx < 16) {
pshufbMask.push_back(DAG.getConstant(0x80, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0x80, MVT::i8));
continue;
}
pshufbMask.push_back(DAG.getConstant(EltIdx - 16, MVT::i8));
pshufbMask.push_back(DAG.getConstant(EltIdx - 15, MVT::i8));
}
V2 = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, V2);
V2 = DAG.getNode(X86ISD::PSHUFB, dl, MVT::v16i8, V2,
DAG.getNode(ISD::BUILD_VECTOR, dl,
MVT::v16i8, &pshufbMask[0], 16));
V1 = DAG.getNode(ISD::OR, dl, MVT::v16i8, V1, V2);
return DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, V1);
}
// If BestLoQuad >= 0, generate a pshuflw to put the low elements in order,
// and update MaskVals with new element order.
std::bitset<8> InOrder;
if (BestLoQuad >= 0) {
int MaskV[] = { -1, -1, -1, -1, 4, 5, 6, 7 };
for (int i = 0; i != 4; ++i) {
int idx = MaskVals[i];
if (idx < 0) {
InOrder.set(i);
} else if ((idx / 4) == BestLoQuad) {
MaskV[i] = idx & 3;
InOrder.set(i);
}
}
NewV = DAG.getVectorShuffle(MVT::v8i16, dl, NewV, DAG.getUNDEF(MVT::v8i16),
&MaskV[0]);
if (NewV.getOpcode() == ISD::VECTOR_SHUFFLE && Subtarget->hasSSSE3()) {
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(NewV.getNode());
NewV = getTargetShuffleNode(X86ISD::PSHUFLW, dl, MVT::v8i16,
NewV.getOperand(0),
getShufflePSHUFLWImmediate(SVOp), DAG);
}
}
// If BestHi >= 0, generate a pshufhw to put the high elements in order,
// and update MaskVals with the new element order.
if (BestHiQuad >= 0) {
int MaskV[] = { 0, 1, 2, 3, -1, -1, -1, -1 };
for (unsigned i = 4; i != 8; ++i) {
int idx = MaskVals[i];
if (idx < 0) {
InOrder.set(i);
} else if ((idx / 4) == BestHiQuad) {
MaskV[i] = (idx & 3) + 4;
InOrder.set(i);
}
}
NewV = DAG.getVectorShuffle(MVT::v8i16, dl, NewV, DAG.getUNDEF(MVT::v8i16),
&MaskV[0]);
if (NewV.getOpcode() == ISD::VECTOR_SHUFFLE && Subtarget->hasSSSE3()) {
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(NewV.getNode());
NewV = getTargetShuffleNode(X86ISD::PSHUFHW, dl, MVT::v8i16,
NewV.getOperand(0),
getShufflePSHUFHWImmediate(SVOp), DAG);
}
}
// In case BestHi & BestLo were both -1, which means each quadword has a word
// from each of the four input quadwords, calculate the InOrder bitvector now
// before falling through to the insert/extract cleanup.
if (BestLoQuad == -1 && BestHiQuad == -1) {
NewV = V1;
for (int i = 0; i != 8; ++i)
if (MaskVals[i] < 0 || MaskVals[i] == i)
InOrder.set(i);
}
// The other elements are put in the right place using pextrw and pinsrw.
for (unsigned i = 0; i != 8; ++i) {
if (InOrder[i])
continue;
int EltIdx = MaskVals[i];
if (EltIdx < 0)
continue;
SDValue ExtOp = (EltIdx < 8)
? DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i16, V1,
DAG.getIntPtrConstant(EltIdx))
: DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i16, V2,
DAG.getIntPtrConstant(EltIdx - 8));
NewV = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v8i16, NewV, ExtOp,
DAG.getIntPtrConstant(i));
}
return NewV;
}
// v16i8 shuffles - Prefer shuffles in the following order:
// 1. [ssse3] 1 x pshufb
// 2. [ssse3] 2 x pshufb + 1 x por
// 3. [all] v8i16 shuffle + N x pextrw + rotate + pinsrw
static
SDValue LowerVECTOR_SHUFFLEv16i8(ShuffleVectorSDNode *SVOp,
SelectionDAG &DAG,
const X86TargetLowering &TLI) {
SDValue V1 = SVOp->getOperand(0);
SDValue V2 = SVOp->getOperand(1);
DebugLoc dl = SVOp->getDebugLoc();
ArrayRef<int> MaskVals = SVOp->getMask();
// If we have SSSE3, case 1 is generated when all result bytes come from
// one of the inputs. Otherwise, case 2 is generated. If no SSSE3 is
// present, fall back to case 3.
// FIXME: kill V2Only once shuffles are canonizalized by getNode.
bool V1Only = true;
bool V2Only = true;
for (unsigned i = 0; i < 16; ++i) {
int EltIdx = MaskVals[i];
if (EltIdx < 0)
continue;
if (EltIdx < 16)
V2Only = false;
else
V1Only = false;
}
// If SSSE3, use 1 pshufb instruction per vector with elements in the result.
if (TLI.getSubtarget()->hasSSSE3()) {
SmallVector<SDValue,16> pshufbMask;
// If all result elements are from one input vector, then only translate
// undef mask values to 0x80 (zero out result) in the pshufb mask.
//
// Otherwise, we have elements from both input vectors, and must zero out
// elements that come from V2 in the first mask, and V1 in the second mask
// so that we can OR them together.
bool TwoInputs = !(V1Only || V2Only);
for (unsigned i = 0; i != 16; ++i) {
int EltIdx = MaskVals[i];
if (EltIdx < 0 || (TwoInputs && EltIdx >= 16)) {
pshufbMask.push_back(DAG.getConstant(0x80, MVT::i8));
continue;
}
pshufbMask.push_back(DAG.getConstant(EltIdx, MVT::i8));
}
// If all the elements are from V2, assign it to V1 and return after
// building the first pshufb.
if (V2Only)
V1 = V2;
V1 = DAG.getNode(X86ISD::PSHUFB, dl, MVT::v16i8, V1,
DAG.getNode(ISD::BUILD_VECTOR, dl,
MVT::v16i8, &pshufbMask[0], 16));
if (!TwoInputs)
return V1;
// Calculate the shuffle mask for the second input, shuffle it, and
// OR it with the first shuffled input.
pshufbMask.clear();
for (unsigned i = 0; i != 16; ++i) {
int EltIdx = MaskVals[i];
if (EltIdx < 16) {
pshufbMask.push_back(DAG.getConstant(0x80, MVT::i8));
continue;
}
pshufbMask.push_back(DAG.getConstant(EltIdx - 16, MVT::i8));
}
V2 = DAG.getNode(X86ISD::PSHUFB, dl, MVT::v16i8, V2,
DAG.getNode(ISD::BUILD_VECTOR, dl,
MVT::v16i8, &pshufbMask[0], 16));
return DAG.getNode(ISD::OR, dl, MVT::v16i8, V1, V2);
}
// No SSSE3 - Calculate in place words and then fix all out of place words
// With 0-16 extracts & inserts. Worst case is 16 bytes out of order from
// the 16 different words that comprise the two doublequadword input vectors.
V1 = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, V1);
V2 = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, V2);
SDValue NewV = V2Only ? V2 : V1;
for (int i = 0; i != 8; ++i) {
int Elt0 = MaskVals[i*2];
int Elt1 = MaskVals[i*2+1];
// This word of the result is all undef, skip it.
if (Elt0 < 0 && Elt1 < 0)
continue;
// This word of the result is already in the correct place, skip it.
if (V1Only && (Elt0 == i*2) && (Elt1 == i*2+1))
continue;
if (V2Only && (Elt0 == i*2+16) && (Elt1 == i*2+17))
continue;
SDValue Elt0Src = Elt0 < 16 ? V1 : V2;
SDValue Elt1Src = Elt1 < 16 ? V1 : V2;
SDValue InsElt;
// If Elt0 and Elt1 are defined, are consecutive, and can be load
// using a single extract together, load it and store it.
if ((Elt0 >= 0) && ((Elt0 + 1) == Elt1) && ((Elt0 & 1) == 0)) {
InsElt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i16, Elt1Src,
DAG.getIntPtrConstant(Elt1 / 2));
NewV = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v8i16, NewV, InsElt,
DAG.getIntPtrConstant(i));
continue;
}
// If Elt1 is defined, extract it from the appropriate source. If the
// source byte is not also odd, shift the extracted word left 8 bits
// otherwise clear the bottom 8 bits if we need to do an or.
if (Elt1 >= 0) {
InsElt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i16, Elt1Src,
DAG.getIntPtrConstant(Elt1 / 2));
if ((Elt1 & 1) == 0)
InsElt = DAG.getNode(ISD::SHL, dl, MVT::i16, InsElt,
DAG.getConstant(8,
TLI.getShiftAmountTy(InsElt.getValueType())));
else if (Elt0 >= 0)
InsElt = DAG.getNode(ISD::AND, dl, MVT::i16, InsElt,
DAG.getConstant(0xFF00, MVT::i16));
}
// If Elt0 is defined, extract it from the appropriate source. If the
// source byte is not also even, shift the extracted word right 8 bits. If
// Elt1 was also defined, OR the extracted values together before
// inserting them in the result.
if (Elt0 >= 0) {
SDValue InsElt0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i16,
Elt0Src, DAG.getIntPtrConstant(Elt0 / 2));
if ((Elt0 & 1) != 0)
InsElt0 = DAG.getNode(ISD::SRL, dl, MVT::i16, InsElt0,
DAG.getConstant(8,
TLI.getShiftAmountTy(InsElt0.getValueType())));
else if (Elt1 >= 0)
InsElt0 = DAG.getNode(ISD::AND, dl, MVT::i16, InsElt0,
DAG.getConstant(0x00FF, MVT::i16));
InsElt = Elt1 >= 0 ? DAG.getNode(ISD::OR, dl, MVT::i16, InsElt, InsElt0)
: InsElt0;
}
NewV = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v8i16, NewV, InsElt,
DAG.getIntPtrConstant(i));
}
return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, NewV);
}
/// RewriteAsNarrowerShuffle - Try rewriting v8i16 and v16i8 shuffles as 4 wide
/// ones, or rewriting v4i32 / v4f32 as 2 wide ones if possible. This can be
/// done when every pair / quad of shuffle mask elements point to elements in
/// the right sequence. e.g.
/// vector_shuffle X, Y, <2, 3, | 10, 11, | 0, 1, | 14, 15>
static
SDValue RewriteAsNarrowerShuffle(ShuffleVectorSDNode *SVOp,
SelectionDAG &DAG, DebugLoc dl) {
EVT VT = SVOp->getValueType(0);
SDValue V1 = SVOp->getOperand(0);
SDValue V2 = SVOp->getOperand(1);
unsigned NumElems = VT.getVectorNumElements();
unsigned NewWidth = (NumElems == 4) ? 2 : 4;
EVT NewVT;
switch (VT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Unexpected!");
case MVT::v4f32: NewVT = MVT::v2f64; break;
case MVT::v4i32: NewVT = MVT::v2i64; break;
case MVT::v8i16: NewVT = MVT::v4i32; break;
case MVT::v16i8: NewVT = MVT::v4i32; break;
}
int Scale = NumElems / NewWidth;
SmallVector<int, 8> MaskVec;
for (unsigned i = 0; i < NumElems; i += Scale) {
int StartIdx = -1;
for (int j = 0; j < Scale; ++j) {
int EltIdx = SVOp->getMaskElt(i+j);
if (EltIdx < 0)
continue;
if (StartIdx == -1)
StartIdx = EltIdx - (EltIdx % Scale);
if (EltIdx != StartIdx + j)
return SDValue();
}
if (StartIdx == -1)
MaskVec.push_back(-1);
else
MaskVec.push_back(StartIdx / Scale);
}
V1 = DAG.getNode(ISD::BITCAST, dl, NewVT, V1);
V2 = DAG.getNode(ISD::BITCAST, dl, NewVT, V2);
return DAG.getVectorShuffle(NewVT, dl, V1, V2, &MaskVec[0]);
}
/// getVZextMovL - Return a zero-extending vector move low node.
///
static SDValue getVZextMovL(EVT VT, EVT OpVT,
SDValue SrcOp, SelectionDAG &DAG,
const X86Subtarget *Subtarget, DebugLoc dl) {
if (VT == MVT::v2f64 || VT == MVT::v4f32) {
LoadSDNode *LD = NULL;
if (!isScalarLoadToVector(SrcOp.getNode(), &LD))
LD = dyn_cast<LoadSDNode>(SrcOp);
if (!LD) {
// movssrr and movsdrr do not clear top bits. Try to use movd, movq
// instead.
MVT ExtVT = (OpVT == MVT::v2f64) ? MVT::i64 : MVT::i32;
if ((ExtVT != MVT::i64 || Subtarget->is64Bit()) &&
SrcOp.getOpcode() == ISD::SCALAR_TO_VECTOR &&
SrcOp.getOperand(0).getOpcode() == ISD::BITCAST &&
SrcOp.getOperand(0).getOperand(0).getValueType() == ExtVT) {
// PR2108
OpVT = (OpVT == MVT::v2f64) ? MVT::v2i64 : MVT::v4i32;
return DAG.getNode(ISD::BITCAST, dl, VT,
DAG.getNode(X86ISD::VZEXT_MOVL, dl, OpVT,
DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
OpVT,
SrcOp.getOperand(0)
.getOperand(0))));
}
}
}
return DAG.getNode(ISD::BITCAST, dl, VT,
DAG.getNode(X86ISD::VZEXT_MOVL, dl, OpVT,
DAG.getNode(ISD::BITCAST, dl,
OpVT, SrcOp)));
}
/// LowerVECTOR_SHUFFLE_256 - Handle all 256-bit wide vectors shuffles
/// which could not be matched by any known target speficic shuffle
static SDValue
LowerVECTOR_SHUFFLE_256(ShuffleVectorSDNode *SVOp, SelectionDAG &DAG) {
EVT VT = SVOp->getValueType(0);
unsigned NumElems = VT.getVectorNumElements();
unsigned NumLaneElems = NumElems / 2;
DebugLoc dl = SVOp->getDebugLoc();
MVT EltVT = VT.getVectorElementType().getSimpleVT();
EVT NVT = MVT::getVectorVT(EltVT, NumLaneElems);
SDValue Shufs[2];
SmallVector<int, 16> Mask;
for (unsigned l = 0; l < 2; ++l) {
// Build a shuffle mask for the output, discovering on the fly which
// input vectors to use as shuffle operands (recorded in InputUsed).
// If building a suitable shuffle vector proves too hard, then bail
// out with useBuildVector set.
int InputUsed[2] = { -1, -1 }; // Not yet discovered.
unsigned LaneStart = l * NumLaneElems;
for (unsigned i = 0; i != NumLaneElems; ++i) {
// The mask element. This indexes into the input.
int Idx = SVOp->getMaskElt(i+LaneStart);
if (Idx < 0) {
// the mask element does not index into any input vector.
Mask.push_back(-1);
continue;
}
// The input vector this mask element indexes into.
int Input = Idx / NumLaneElems;
// Turn the index into an offset from the start of the input vector.
Idx -= Input * NumLaneElems;
// Find or create a shuffle vector operand to hold this input.
unsigned OpNo;
for (OpNo = 0; OpNo < array_lengthof(InputUsed); ++OpNo) {
if (InputUsed[OpNo] == Input)
// This input vector is already an operand.
break;
if (InputUsed[OpNo] < 0) {
// Create a new operand for this input vector.
InputUsed[OpNo] = Input;
break;
}
}
if (OpNo >= array_lengthof(InputUsed)) {
// More than two input vectors used! Give up.
return SDValue();
}
// Add the mask index for the new shuffle vector.
Mask.push_back(Idx + OpNo * NumLaneElems);
}
if (InputUsed[0] < 0) {
// No input vectors were used! The result is undefined.
Shufs[l] = DAG.getUNDEF(NVT);
} else {
SDValue Op0 = Extract128BitVector(SVOp->getOperand(InputUsed[0] / 2),
(InputUsed[0] % 2) * NumLaneElems,
DAG, dl);
// If only one input was used, use an undefined vector for the other.
SDValue Op1 = (InputUsed[1] < 0) ? DAG.getUNDEF(NVT) :
Extract128BitVector(SVOp->getOperand(InputUsed[1] / 2),
(InputUsed[1] % 2) * NumLaneElems, DAG, dl);
// At least one input vector was used. Create a new shuffle vector.
Shufs[l] = DAG.getVectorShuffle(NVT, dl, Op0, Op1, &Mask[0]);
}
Mask.clear();
}
// Concatenate the result back
return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, Shufs[0], Shufs[1]);
}
/// LowerVECTOR_SHUFFLE_128v4 - Handle all 128-bit wide vectors with
/// 4 elements, and match them with several different shuffle types.
static SDValue
LowerVECTOR_SHUFFLE_128v4(ShuffleVectorSDNode *SVOp, SelectionDAG &DAG) {
SDValue V1 = SVOp->getOperand(0);
SDValue V2 = SVOp->getOperand(1);
DebugLoc dl = SVOp->getDebugLoc();
EVT VT = SVOp->getValueType(0);
assert(VT.getSizeInBits() == 128 && "Unsupported vector size");
std::pair<int, int> Locs[4];
int Mask1[] = { -1, -1, -1, -1 };
SmallVector<int, 8> PermMask(SVOp->getMask().begin(), SVOp->getMask().end());
unsigned NumHi = 0;
unsigned NumLo = 0;
for (unsigned i = 0; i != 4; ++i) {
int Idx = PermMask[i];
if (Idx < 0) {
Locs[i] = std::make_pair(-1, -1);
} else {
assert(Idx < 8 && "Invalid VECTOR_SHUFFLE index!");
if (Idx < 4) {
Locs[i] = std::make_pair(0, NumLo);
Mask1[NumLo] = Idx;
NumLo++;
} else {
Locs[i] = std::make_pair(1, NumHi);
if (2+NumHi < 4)
Mask1[2+NumHi] = Idx;
NumHi++;
}
}
}
if (NumLo <= 2 && NumHi <= 2) {
// If no more than two elements come from either vector. This can be
// implemented with two shuffles. First shuffle gather the elements.
// The second shuffle, which takes the first shuffle as both of its
// vector operands, put the elements into the right order.
V1 = DAG.getVectorShuffle(VT, dl, V1, V2, &Mask1[0]);
int Mask2[] = { -1, -1, -1, -1 };
for (unsigned i = 0; i != 4; ++i)
if (Locs[i].first != -1) {
unsigned Idx = (i < 2) ? 0 : 4;
Idx += Locs[i].first * 2 + Locs[i].second;
Mask2[i] = Idx;
}
return DAG.getVectorShuffle(VT, dl, V1, V1, &Mask2[0]);
}
if (NumLo == 3 || NumHi == 3) {
// Otherwise, we must have three elements from one vector, call it X, and
// one element from the other, call it Y. First, use a shufps to build an
// intermediate vector with the one element from Y and the element from X
// that will be in the same half in the final destination (the indexes don't
// matter). Then, use a shufps to build the final vector, taking the half
// containing the element from Y from the intermediate, and the other half
// from X.
if (NumHi == 3) {
// Normalize it so the 3 elements come from V1.
CommuteVectorShuffleMask(PermMask, 4);
std::swap(V1, V2);
}
// Find the element from V2.
unsigned HiIndex;
for (HiIndex = 0; HiIndex < 3; ++HiIndex) {
int Val = PermMask[HiIndex];
if (Val < 0)
continue;
if (Val >= 4)
break;
}
Mask1[0] = PermMask[HiIndex];
Mask1[1] = -1;
Mask1[2] = PermMask[HiIndex^1];
Mask1[3] = -1;
V2 = DAG.getVectorShuffle(VT, dl, V1, V2, &Mask1[0]);
if (HiIndex >= 2) {
Mask1[0] = PermMask[0];
Mask1[1] = PermMask[1];
Mask1[2] = HiIndex & 1 ? 6 : 4;
Mask1[3] = HiIndex & 1 ? 4 : 6;
return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask1[0]);
}
Mask1[0] = HiIndex & 1 ? 2 : 0;
Mask1[1] = HiIndex & 1 ? 0 : 2;
Mask1[2] = PermMask[2];
Mask1[3] = PermMask[3];
if (Mask1[2] >= 0)
Mask1[2] += 4;
if (Mask1[3] >= 0)
Mask1[3] += 4;
return DAG.getVectorShuffle(VT, dl, V2, V1, &Mask1[0]);
}
// Break it into (shuffle shuffle_hi, shuffle_lo).
int LoMask[] = { -1, -1, -1, -1 };
int HiMask[] = { -1, -1, -1, -1 };
int *MaskPtr = LoMask;
unsigned MaskIdx = 0;
unsigned LoIdx = 0;
unsigned HiIdx = 2;
for (unsigned i = 0; i != 4; ++i) {
if (i == 2) {
MaskPtr = HiMask;
MaskIdx = 1;
LoIdx = 0;
HiIdx = 2;
}
int Idx = PermMask[i];
if (Idx < 0) {
Locs[i] = std::make_pair(-1, -1);
} else if (Idx < 4) {
Locs[i] = std::make_pair(MaskIdx, LoIdx);
MaskPtr[LoIdx] = Idx;
LoIdx++;
} else {
Locs[i] = std::make_pair(MaskIdx, HiIdx);
MaskPtr[HiIdx] = Idx;
HiIdx++;
}
}
SDValue LoShuffle = DAG.getVectorShuffle(VT, dl, V1, V2, &LoMask[0]);
SDValue HiShuffle = DAG.getVectorShuffle(VT, dl, V1, V2, &HiMask[0]);
int MaskOps[] = { -1, -1, -1, -1 };
for (unsigned i = 0; i != 4; ++i)
if (Locs[i].first != -1)
MaskOps[i] = Locs[i].first * 4 + Locs[i].second;
return DAG.getVectorShuffle(VT, dl, LoShuffle, HiShuffle, &MaskOps[0]);
}
static bool MayFoldVectorLoad(SDValue V) {
if (V.hasOneUse() && V.getOpcode() == ISD::BITCAST)
V = V.getOperand(0);
if (V.hasOneUse() && V.getOpcode() == ISD::SCALAR_TO_VECTOR)
V = V.getOperand(0);
if (V.hasOneUse() && V.getOpcode() == ISD::BUILD_VECTOR &&
V.getNumOperands() == 2 && V.getOperand(1).getOpcode() == ISD::UNDEF)
// BUILD_VECTOR (load), undef
V = V.getOperand(0);
if (MayFoldLoad(V))
return true;
return false;
}
// FIXME: the version above should always be used. Since there's
// a bug where several vector shuffles can't be folded because the
// DAG is not updated during lowering and a node claims to have two
// uses while it only has one, use this version, and let isel match
// another instruction if the load really happens to have more than
// one use. Remove this version after this bug get fixed.
// rdar://8434668, PR8156
static bool RelaxedMayFoldVectorLoad(SDValue V) {
if (V.hasOneUse() && V.getOpcode() == ISD::BITCAST)
V = V.getOperand(0);
if (V.hasOneUse() && V.getOpcode() == ISD::SCALAR_TO_VECTOR)
V = V.getOperand(0);
if (ISD::isNormalLoad(V.getNode()))
return true;
return false;
}
static
SDValue getMOVDDup(SDValue &Op, DebugLoc &dl, SDValue V1, SelectionDAG &DAG) {
EVT VT = Op.getValueType();
// Canonizalize to v2f64.
V1 = DAG.getNode(ISD::BITCAST, dl, MVT::v2f64, V1);
return DAG.getNode(ISD::BITCAST, dl, VT,
getTargetShuffleNode(X86ISD::MOVDDUP, dl, MVT::v2f64,
V1, DAG));
}
static
SDValue getMOVLowToHigh(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG,
bool HasSSE2) {
SDValue V1 = Op.getOperand(0);
SDValue V2 = Op.getOperand(1);
EVT VT = Op.getValueType();
assert(VT != MVT::v2i64 && "unsupported shuffle type");
if (HasSSE2 && VT == MVT::v2f64)
return getTargetShuffleNode(X86ISD::MOVLHPD, dl, VT, V1, V2, DAG);
// v4f32 or v4i32: canonizalized to v4f32 (which is legal for SSE1)
return DAG.getNode(ISD::BITCAST, dl, VT,
getTargetShuffleNode(X86ISD::MOVLHPS, dl, MVT::v4f32,
DAG.getNode(ISD::BITCAST, dl, MVT::v4f32, V1),
DAG.getNode(ISD::BITCAST, dl, MVT::v4f32, V2), DAG));
}
static
SDValue getMOVHighToLow(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG) {
SDValue V1 = Op.getOperand(0);
SDValue V2 = Op.getOperand(1);
EVT VT = Op.getValueType();
assert((VT == MVT::v4i32 || VT == MVT::v4f32) &&
"unsupported shuffle type");
if (V2.getOpcode() == ISD::UNDEF)
V2 = V1;
// v4i32 or v4f32
return getTargetShuffleNode(X86ISD::MOVHLPS, dl, VT, V1, V2, DAG);
}
static
SDValue getMOVLP(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG, bool HasSSE2) {
SDValue V1 = Op.getOperand(0);
SDValue V2 = Op.getOperand(1);
EVT VT = Op.getValueType();
unsigned NumElems = VT.getVectorNumElements();
// Use MOVLPS and MOVLPD in case V1 or V2 are loads. During isel, the second
// operand of these instructions is only memory, so check if there's a
// potencial load folding here, otherwise use SHUFPS or MOVSD to match the
// same masks.
bool CanFoldLoad = false;
// Trivial case, when V2 comes from a load.
if (MayFoldVectorLoad(V2))
CanFoldLoad = true;
// When V1 is a load, it can be folded later into a store in isel, example:
// (store (v4f32 (X86Movlps (load addr:$src1), VR128:$src2)), addr:$src1)
// turns into:
// (MOVLPSmr addr:$src1, VR128:$src2)
// So, recognize this potential and also use MOVLPS or MOVLPD
else if (MayFoldVectorLoad(V1) && MayFoldIntoStore(Op))
CanFoldLoad = true;
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
if (CanFoldLoad) {
if (HasSSE2 && NumElems == 2)
return getTargetShuffleNode(X86ISD::MOVLPD, dl, VT, V1, V2, DAG);
if (NumElems == 4)
// If we don't care about the second element, procede to use movss.
if (SVOp->getMaskElt(1) != -1)
return getTargetShuffleNode(X86ISD::MOVLPS, dl, VT, V1, V2, DAG);
}
// movl and movlp will both match v2i64, but v2i64 is never matched by
// movl earlier because we make it strict to avoid messing with the movlp load
// folding logic (see the code above getMOVLP call). Match it here then,
// this is horrible, but will stay like this until we move all shuffle
// matching to x86 specific nodes. Note that for the 1st condition all
// types are matched with movsd.
if (HasSSE2) {
// FIXME: isMOVLMask should be checked and matched before getMOVLP,
// as to remove this logic from here, as much as possible
if (NumElems == 2 || !isMOVLMask(SVOp->getMask(), VT))
return getTargetShuffleNode(X86ISD::MOVSD, dl, VT, V1, V2, DAG);
return getTargetShuffleNode(X86ISD::MOVSS, dl, VT, V1, V2, DAG);
}
assert(VT != MVT::v4i32 && "unsupported shuffle type");
// Invert the operand order and use SHUFPS to match it.
return getTargetShuffleNode(X86ISD::SHUFP, dl, VT, V2, V1,
getShuffleSHUFImmediate(SVOp), DAG);
}
SDValue
X86TargetLowering::NormalizeVectorShuffle(SDValue Op, SelectionDAG &DAG) const {
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
SDValue V1 = Op.getOperand(0);
SDValue V2 = Op.getOperand(1);
if (isZeroShuffle(SVOp))
return getZeroVector(VT, Subtarget, DAG, dl);
// Handle splat operations
if (SVOp->isSplat()) {
unsigned NumElem = VT.getVectorNumElements();
int Size = VT.getSizeInBits();
// Use vbroadcast whenever the splat comes from a foldable load
SDValue Broadcast = LowerVectorBroadcast(Op, DAG);
if (Broadcast.getNode())
return Broadcast;
// Handle splats by matching through known shuffle masks
if ((Size == 128 && NumElem <= 4) ||
(Size == 256 && NumElem < 8))
return SDValue();
// All remaning splats are promoted to target supported vector shuffles.
return PromoteSplat(SVOp, DAG);
}
// If the shuffle can be profitably rewritten as a narrower shuffle, then
// do it!
if (VT == MVT::v8i16 || VT == MVT::v16i8) {
SDValue NewOp = RewriteAsNarrowerShuffle(SVOp, DAG, dl);
if (NewOp.getNode())
return DAG.getNode(ISD::BITCAST, dl, VT, NewOp);
} else if ((VT == MVT::v4i32 ||
(VT == MVT::v4f32 && Subtarget->hasSSE2()))) {
// FIXME: Figure out a cleaner way to do this.
// Try to make use of movq to zero out the top part.
if (ISD::isBuildVectorAllZeros(V2.getNode())) {
SDValue NewOp = RewriteAsNarrowerShuffle(SVOp, DAG, dl);
if (NewOp.getNode()) {
EVT NewVT = NewOp.getValueType();
if (isCommutedMOVLMask(cast<ShuffleVectorSDNode>(NewOp)->getMask(),
NewVT, true, false))
return getVZextMovL(VT, NewVT, NewOp.getOperand(0),
DAG, Subtarget, dl);
}
} else if (ISD::isBuildVectorAllZeros(V1.getNode())) {
SDValue NewOp = RewriteAsNarrowerShuffle(SVOp, DAG, dl);
if (NewOp.getNode()) {
EVT NewVT = NewOp.getValueType();
if (isMOVLMask(cast<ShuffleVectorSDNode>(NewOp)->getMask(), NewVT))
return getVZextMovL(VT, NewVT, NewOp.getOperand(1),
DAG, Subtarget, dl);
}
}
}
return SDValue();
}
SDValue
X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const {
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
SDValue V1 = Op.getOperand(0);
SDValue V2 = Op.getOperand(1);
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
unsigned NumElems = VT.getVectorNumElements();
bool V1IsUndef = V1.getOpcode() == ISD::UNDEF;
bool V2IsUndef = V2.getOpcode() == ISD::UNDEF;
bool V1IsSplat = false;
bool V2IsSplat = false;
bool HasSSE2 = Subtarget->hasSSE2();
bool HasAVX = Subtarget->hasAVX();
bool HasAVX2 = Subtarget->hasAVX2();
MachineFunction &MF = DAG.getMachineFunction();
bool OptForSize = MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize);
assert(VT.getSizeInBits() != 64 && "Can't lower MMX shuffles");
if (V1IsUndef && V2IsUndef)
return DAG.getUNDEF(VT);
assert(!V1IsUndef && "Op 1 of shuffle should not be undef");
// Vector shuffle lowering takes 3 steps:
//
// 1) Normalize the input vectors. Here splats, zeroed vectors, profitable
// narrowing and commutation of operands should be handled.
// 2) Matching of shuffles with known shuffle masks to x86 target specific
// shuffle nodes.
// 3) Rewriting of unmatched masks into new generic shuffle operations,
// so the shuffle can be broken into other shuffles and the legalizer can
// try the lowering again.
//
// The general idea is that no vector_shuffle operation should be left to
// be matched during isel, all of them must be converted to a target specific
// node here.
// Normalize the input vectors. Here splats, zeroed vectors, profitable
// narrowing and commutation of operands should be handled. The actual code
// doesn't include all of those, work in progress...
SDValue NewOp = NormalizeVectorShuffle(Op, DAG);
if (NewOp.getNode())
return NewOp;
SmallVector<int, 8> M(SVOp->getMask().begin(), SVOp->getMask().end());
// NOTE: isPSHUFDMask can also match both masks below (unpckl_undef and
// unpckh_undef). Only use pshufd if speed is more important than size.
if (OptForSize && isUNPCKL_v_undef_Mask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::UNPCKL, dl, VT, V1, V1, DAG);
if (OptForSize && isUNPCKH_v_undef_Mask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::UNPCKH, dl, VT, V1, V1, DAG);
if (isMOVDDUPMask(M, VT) && Subtarget->hasSSE3() &&
V2IsUndef && RelaxedMayFoldVectorLoad(V1))
return getMOVDDup(Op, dl, V1, DAG);
if (isMOVHLPS_v_undef_Mask(M, VT))
return getMOVHighToLow(Op, dl, DAG);
// Use to match splats
if (HasSSE2 && isUNPCKHMask(M, VT, HasAVX2) && V2IsUndef &&
(VT == MVT::v2f64 || VT == MVT::v2i64))
return getTargetShuffleNode(X86ISD::UNPCKH, dl, VT, V1, V1, DAG);
if (isPSHUFDMask(M, VT)) {
// The actual implementation will match the mask in the if above and then
// during isel it can match several different instructions, not only pshufd
// as its name says, sad but true, emulate the behavior for now...
if (isMOVDDUPMask(M, VT) && ((VT == MVT::v4f32 || VT == MVT::v2i64)))
return getTargetShuffleNode(X86ISD::MOVLHPS, dl, VT, V1, V1, DAG);
unsigned TargetMask = getShuffleSHUFImmediate(SVOp);
if (HasAVX && (VT == MVT::v4f32 || VT == MVT::v2f64))
return getTargetShuffleNode(X86ISD::VPERMILP, dl, VT, V1, TargetMask, DAG);
if (HasSSE2 && (VT == MVT::v4f32 || VT == MVT::v4i32))
return getTargetShuffleNode(X86ISD::PSHUFD, dl, VT, V1, TargetMask, DAG);
return getTargetShuffleNode(X86ISD::SHUFP, dl, VT, V1, V1,
TargetMask, DAG);
}
// Check if this can be converted into a logical shift.
bool isLeft = false;
unsigned ShAmt = 0;
SDValue ShVal;
bool isShift = HasSSE2 && isVectorShift(SVOp, DAG, isLeft, ShVal, ShAmt);
if (isShift && ShVal.hasOneUse()) {
// If the shifted value has multiple uses, it may be cheaper to use
// v_set0 + movlhps or movhlps, etc.
EVT EltVT = VT.getVectorElementType();
ShAmt *= EltVT.getSizeInBits();
return getVShift(isLeft, VT, ShVal, ShAmt, DAG, *this, dl);
}
if (isMOVLMask(M, VT)) {
if (ISD::isBuildVectorAllZeros(V1.getNode()))
return getVZextMovL(VT, VT, V2, DAG, Subtarget, dl);
if (!isMOVLPMask(M, VT)) {
if (HasSSE2 && (VT == MVT::v2i64 || VT == MVT::v2f64))
return getTargetShuffleNode(X86ISD::MOVSD, dl, VT, V1, V2, DAG);
if (VT == MVT::v4i32 || VT == MVT::v4f32)
return getTargetShuffleNode(X86ISD::MOVSS, dl, VT, V1, V2, DAG);
}
}
// FIXME: fold these into legal mask.
if (isMOVLHPSMask(M, VT) && !isUNPCKLMask(M, VT, HasAVX2))
return getMOVLowToHigh(Op, dl, DAG, HasSSE2);
if (isMOVHLPSMask(M, VT))
return getMOVHighToLow(Op, dl, DAG);
if (V2IsUndef && isMOVSHDUPMask(M, VT, Subtarget))
return getTargetShuffleNode(X86ISD::MOVSHDUP, dl, VT, V1, DAG);
if (V2IsUndef && isMOVSLDUPMask(M, VT, Subtarget))
return getTargetShuffleNode(X86ISD::MOVSLDUP, dl, VT, V1, DAG);
if (isMOVLPMask(M, VT))
return getMOVLP(Op, dl, DAG, HasSSE2);
if (ShouldXformToMOVHLPS(M, VT) ||
ShouldXformToMOVLP(V1.getNode(), V2.getNode(), M, VT))
return CommuteVectorShuffle(SVOp, DAG);
if (isShift) {
// No better options. Use a vshldq / vsrldq.
EVT EltVT = VT.getVectorElementType();
ShAmt *= EltVT.getSizeInBits();
return getVShift(isLeft, VT, ShVal, ShAmt, DAG, *this, dl);
}
bool Commuted = false;
// FIXME: This should also accept a bitcast of a splat? Be careful, not
// 1,1,1,1 -> v8i16 though.
V1IsSplat = isSplatVector(V1.getNode());
V2IsSplat = isSplatVector(V2.getNode());
// Canonicalize the splat or undef, if present, to be on the RHS.
if (!V2IsUndef && V1IsSplat && !V2IsSplat) {
CommuteVectorShuffleMask(M, NumElems);
std::swap(V1, V2);
std::swap(V1IsSplat, V2IsSplat);
Commuted = true;
}
if (isCommutedMOVLMask(M, VT, V2IsSplat, V2IsUndef)) {
// Shuffling low element of v1 into undef, just return v1.
if (V2IsUndef)
return V1;
// If V2 is a splat, the mask may be malformed such as <4,3,3,3>, which
// the instruction selector will not match, so get a canonical MOVL with
// swapped operands to undo the commute.
return getMOVL(DAG, dl, VT, V2, V1);
}
if (isUNPCKLMask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::UNPCKL, dl, VT, V1, V2, DAG);
if (isUNPCKHMask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::UNPCKH, dl, VT, V1, V2, DAG);
if (V2IsSplat) {
// Normalize mask so all entries that point to V2 points to its first
// element then try to match unpck{h|l} again. If match, return a
// new vector_shuffle with the corrected mask.p
SmallVector<int, 8> NewMask(M.begin(), M.end());
NormalizeMask(NewMask, NumElems);
if (isUNPCKLMask(NewMask, VT, HasAVX2, true))
return getTargetShuffleNode(X86ISD::UNPCKL, dl, VT, V1, V2, DAG);
if (isUNPCKHMask(NewMask, VT, HasAVX2, true))
return getTargetShuffleNode(X86ISD::UNPCKH, dl, VT, V1, V2, DAG);
}
if (Commuted) {
// Commute is back and try unpck* again.
// FIXME: this seems wrong.
CommuteVectorShuffleMask(M, NumElems);
std::swap(V1, V2);
std::swap(V1IsSplat, V2IsSplat);
Commuted = false;
if (isUNPCKLMask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::UNPCKL, dl, VT, V1, V2, DAG);
if (isUNPCKHMask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::UNPCKH, dl, VT, V1, V2, DAG);
}
// Normalize the node to match x86 shuffle ops if needed
if (!V2IsUndef && (isSHUFPMask(M, VT, HasAVX, /* Commuted */ true)))
return CommuteVectorShuffle(SVOp, DAG);
// The checks below are all present in isShuffleMaskLegal, but they are
// inlined here right now to enable us to directly emit target specific
// nodes, and remove one by one until they don't return Op anymore.
if (isPALIGNRMask(M, VT, Subtarget))
return getTargetShuffleNode(X86ISD::PALIGN, dl, VT, V1, V2,
getShufflePALIGNRImmediate(SVOp),
DAG);
if (ShuffleVectorSDNode::isSplatMask(&M[0], VT) &&
SVOp->getSplatIndex() == 0 && V2IsUndef) {
if (VT == MVT::v2f64 || VT == MVT::v2i64)
return getTargetShuffleNode(X86ISD::UNPCKL, dl, VT, V1, V1, DAG);
}
if (isPSHUFHWMask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::PSHUFHW, dl, VT, V1,
getShufflePSHUFHWImmediate(SVOp),
DAG);
if (isPSHUFLWMask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::PSHUFLW, dl, VT, V1,
getShufflePSHUFLWImmediate(SVOp),
DAG);
if (isSHUFPMask(M, VT, HasAVX))
return getTargetShuffleNode(X86ISD::SHUFP, dl, VT, V1, V2,
getShuffleSHUFImmediate(SVOp), DAG);
if (isUNPCKL_v_undef_Mask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::UNPCKL, dl, VT, V1, V1, DAG);
if (isUNPCKH_v_undef_Mask(M, VT, HasAVX2))
return getTargetShuffleNode(X86ISD::UNPCKH, dl, VT, V1, V1, DAG);
//===--------------------------------------------------------------------===//
// Generate target specific nodes for 128 or 256-bit shuffles only
// supported in the AVX instruction set.
//
// Handle VMOVDDUPY permutations
if (V2IsUndef && isMOVDDUPYMask(M, VT, HasAVX))
return getTargetShuffleNode(X86ISD::MOVDDUP, dl, VT, V1, DAG);
// Handle VPERMILPS/D* permutations
if (isVPERMILPMask(M, VT, HasAVX)) {
if (HasAVX2 && VT == MVT::v8i32)
return getTargetShuffleNode(X86ISD::PSHUFD, dl, VT, V1,
getShuffleSHUFImmediate(SVOp), DAG);
return getTargetShuffleNode(X86ISD::VPERMILP, dl, VT, V1,
getShuffleSHUFImmediate(SVOp), DAG);
}
// Handle VPERM2F128/VPERM2I128 permutations
if (isVPERM2X128Mask(M, VT, HasAVX))
return getTargetShuffleNode(X86ISD::VPERM2X128, dl, VT, V1,
V2, getShuffleVPERM2X128Immediate(SVOp), DAG);
SDValue BlendOp = LowerVECTOR_SHUFFLEtoBlend(SVOp, Subtarget, DAG);
if (BlendOp.getNode())
return BlendOp;
if (V2IsUndef && HasAVX2 && (VT == MVT::v8i32 || VT == MVT::v8f32)) {
SmallVector<SDValue, 8> permclMask;
for (unsigned i = 0; i != 8; ++i) {
permclMask.push_back(DAG.getConstant((M[i]>=0) ? M[i] : 0, MVT::i32));
}
SDValue Mask = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8i32,
&permclMask[0], 8);
// Bitcast is for VPERMPS since mask is v8i32 but node takes v8f32
return DAG.getNode(X86ISD::VPERMV, dl, VT,
DAG.getNode(ISD::BITCAST, dl, VT, Mask), V1);
}
if (V2IsUndef && HasAVX2 && (VT == MVT::v4i64 || VT == MVT::v4f64))
return getTargetShuffleNode(X86ISD::VPERMI, dl, VT, V1,
getShuffleCLImmediate(SVOp), DAG);
//===--------------------------------------------------------------------===//
// Since no target specific shuffle was selected for this generic one,
// lower it into other known shuffles. FIXME: this isn't true yet, but
// this is the plan.
//
// Handle v8i16 specifically since SSE can do byte extraction and insertion.
if (VT == MVT::v8i16) {
SDValue NewOp = LowerVECTOR_SHUFFLEv8i16(Op, DAG);
if (NewOp.getNode())
return NewOp;
}
if (VT == MVT::v16i8) {
SDValue NewOp = LowerVECTOR_SHUFFLEv16i8(SVOp, DAG, *this);
if (NewOp.getNode())
return NewOp;
}
// Handle all 128-bit wide vectors with 4 elements, and match them with
// several different shuffle types.
if (NumElems == 4 && VT.getSizeInBits() == 128)
return LowerVECTOR_SHUFFLE_128v4(SVOp, DAG);
// Handle general 256-bit shuffles
if (VT.is256BitVector())
return LowerVECTOR_SHUFFLE_256(SVOp, DAG);
return SDValue();
}
SDValue
X86TargetLowering::LowerEXTRACT_VECTOR_ELT_SSE4(SDValue Op,
SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
if (Op.getOperand(0).getValueType().getSizeInBits() != 128)
return SDValue();
if (VT.getSizeInBits() == 8) {
SDValue Extract = DAG.getNode(X86ISD::PEXTRB, dl, MVT::i32,
Op.getOperand(0), Op.getOperand(1));
SDValue Assert = DAG.getNode(ISD::AssertZext, dl, MVT::i32, Extract,
DAG.getValueType(VT));
return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
}
if (VT.getSizeInBits() == 16) {
unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
// If Idx is 0, it's cheaper to do a move instead of a pextrw.
if (Idx == 0)
return DAG.getNode(ISD::TRUNCATE, dl, MVT::i16,
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
DAG.getNode(ISD::BITCAST, dl,
MVT::v4i32,
Op.getOperand(0)),
Op.getOperand(1)));
SDValue Extract = DAG.getNode(X86ISD::PEXTRW, dl, MVT::i32,
Op.getOperand(0), Op.getOperand(1));
SDValue Assert = DAG.getNode(ISD::AssertZext, dl, MVT::i32, Extract,
DAG.getValueType(VT));
return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
}
if (VT == MVT::f32) {
// EXTRACTPS outputs to a GPR32 register which will require a movd to copy
// the result back to FR32 register. It's only worth matching if the
// result has a single use which is a store or a bitcast to i32. And in
// the case of a store, it's not worth it if the index is a constant 0,
// because a MOVSSmr can be used instead, which is smaller and faster.
if (!Op.hasOneUse())
return SDValue();
SDNode *User = *Op.getNode()->use_begin();
if ((User->getOpcode() != ISD::STORE ||
(isa<ConstantSDNode>(Op.getOperand(1)) &&
cast<ConstantSDNode>(Op.getOperand(1))->isNullValue())) &&
(User->getOpcode() != ISD::BITCAST ||
User->getValueType(0) != MVT::i32))
return SDValue();
SDValue Extract = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
DAG.getNode(ISD::BITCAST, dl, MVT::v4i32,
Op.getOperand(0)),
Op.getOperand(1));
return DAG.getNode(ISD::BITCAST, dl, MVT::f32, Extract);
}
if (VT == MVT::i32 || VT == MVT::i64) {
// ExtractPS/pextrq works with constant index.
if (isa<ConstantSDNode>(Op.getOperand(1)))
return Op;
}
return SDValue();
}
SDValue
X86TargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
SelectionDAG &DAG) const {
if (!isa<ConstantSDNode>(Op.getOperand(1)))
return SDValue();
SDValue Vec = Op.getOperand(0);
EVT VecVT = Vec.getValueType();
// If this is a 256-bit vector result, first extract the 128-bit vector and
// then extract the element from the 128-bit vector.
if (VecVT.getSizeInBits() == 256) {
DebugLoc dl = Op.getNode()->getDebugLoc();
unsigned NumElems = VecVT.getVectorNumElements();
SDValue Idx = Op.getOperand(1);
unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
// Get the 128-bit vector.
Vec = Extract128BitVector(Vec, IdxVal, DAG, dl);
if (IdxVal >= NumElems/2)
IdxVal -= NumElems/2;
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, Op.getValueType(), Vec,
DAG.getConstant(IdxVal, MVT::i32));
}
assert(Vec.getValueSizeInBits() <= 128 && "Unexpected vector length");
if (Subtarget->hasSSE41()) {
SDValue Res = LowerEXTRACT_VECTOR_ELT_SSE4(Op, DAG);
if (Res.getNode())
return Res;
}
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
// TODO: handle v16i8.
if (VT.getSizeInBits() == 16) {
SDValue Vec = Op.getOperand(0);
unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
if (Idx == 0)
return DAG.getNode(ISD::TRUNCATE, dl, MVT::i16,
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
DAG.getNode(ISD::BITCAST, dl,
MVT::v4i32, Vec),
Op.getOperand(1)));
// Transform it so it match pextrw which produces a 32-bit result.
EVT EltVT = MVT::i32;
SDValue Extract = DAG.getNode(X86ISD::PEXTRW, dl, EltVT,
Op.getOperand(0), Op.getOperand(1));
SDValue Assert = DAG.getNode(ISD::AssertZext, dl, EltVT, Extract,
DAG.getValueType(VT));
return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
}
if (VT.getSizeInBits() == 32) {
unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
if (Idx == 0)
return Op;
// SHUFPS the element to the lowest double word, then movss.
int Mask[4] = { static_cast<int>(Idx), -1, -1, -1 };
EVT VVT = Op.getOperand(0).getValueType();
SDValue Vec = DAG.getVectorShuffle(VVT, dl, Op.getOperand(0),
DAG.getUNDEF(VVT), Mask);
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, VT, Vec,
DAG.getIntPtrConstant(0));
}
if (VT.getSizeInBits() == 64) {
// FIXME: .td only matches this for <2 x f64>, not <2 x i64> on 32b
// FIXME: seems like this should be unnecessary if mov{h,l}pd were taught
// to match extract_elt for f64.
unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
if (Idx == 0)
return Op;
// UNPCKHPD the element to the lowest double word, then movsd.
// Note if the lower 64 bits of the result of the UNPCKHPD is then stored
// to a f64mem, the whole operation is folded into a single MOVHPDmr.
int Mask[2] = { 1, -1 };
EVT VVT = Op.getOperand(0).getValueType();
SDValue Vec = DAG.getVectorShuffle(VVT, dl, Op.getOperand(0),
DAG.getUNDEF(VVT), Mask);
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, VT, Vec,
DAG.getIntPtrConstant(0));
}
return SDValue();
}
SDValue
X86TargetLowering::LowerINSERT_VECTOR_ELT_SSE4(SDValue Op,
SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
EVT EltVT = VT.getVectorElementType();
DebugLoc dl = Op.getDebugLoc();
SDValue N0 = Op.getOperand(0);
SDValue N1 = Op.getOperand(1);
SDValue N2 = Op.getOperand(2);
if (VT.getSizeInBits() == 256)
return SDValue();
if ((EltVT.getSizeInBits() == 8 || EltVT.getSizeInBits() == 16) &&
isa<ConstantSDNode>(N2)) {
unsigned Opc;
if (VT == MVT::v8i16)
Opc = X86ISD::PINSRW;
else if (VT == MVT::v16i8)
Opc = X86ISD::PINSRB;
else
Opc = X86ISD::PINSRB;
// Transform it so it match pinsr{b,w} which expects a GR32 as its second
// argument.
if (N1.getValueType() != MVT::i32)
N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
if (N2.getValueType() != MVT::i32)
N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue());
return DAG.getNode(Opc, dl, VT, N0, N1, N2);
}
if (EltVT == MVT::f32 && isa<ConstantSDNode>(N2)) {
// Bits [7:6] of the constant are the source select. This will always be
// zero here. The DAG Combiner may combine an extract_elt index into these
// bits. For example (insert (extract, 3), 2) could be matched by putting
// the '3' into bits [7:6] of X86ISD::INSERTPS.
// Bits [5:4] of the constant are the destination select. This is the
// value of the incoming immediate.
// Bits [3:0] of the constant are the zero mask. The DAG Combiner may
// combine either bitwise AND or insert of float 0.0 to set these bits.
N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue() << 4);
// Create this as a scalar to vector..
N1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4f32, N1);
return DAG.getNode(X86ISD::INSERTPS, dl, VT, N0, N1, N2);
}
if ((EltVT == MVT::i32 || EltVT == MVT::i64) && isa<ConstantSDNode>(N2)) {
// PINSR* works with constant index.
return Op;
}
return SDValue();
}
SDValue
X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
EVT EltVT = VT.getVectorElementType();
DebugLoc dl = Op.getDebugLoc();
SDValue N0 = Op.getOperand(0);
SDValue N1 = Op.getOperand(1);
SDValue N2 = Op.getOperand(2);
// If this is a 256-bit vector result, first extract the 128-bit vector,
// insert the element into the extracted half and then place it back.
if (VT.getSizeInBits() == 256) {
if (!isa<ConstantSDNode>(N2))
return SDValue();
// Get the desired 128-bit vector half.
unsigned NumElems = VT.getVectorNumElements();
unsigned IdxVal = cast<ConstantSDNode>(N2)->getZExtValue();
SDValue V = Extract128BitVector(N0, IdxVal, DAG, dl);
// Insert the element into the desired half.
bool Upper = IdxVal >= NumElems/2;
V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, V.getValueType(), V, N1,
DAG.getConstant(Upper ? IdxVal-NumElems/2 : IdxVal, MVT::i32));
// Insert the changed part back to the 256-bit vector
return Insert128BitVector(N0, V, IdxVal, DAG, dl);
}
if (Subtarget->hasSSE41())
return LowerINSERT_VECTOR_ELT_SSE4(Op, DAG);
if (EltVT == MVT::i8)
return SDValue();
if (EltVT.getSizeInBits() == 16 && isa<ConstantSDNode>(N2)) {
// Transform it so it match pinsrw which expects a 16-bit value in a GR32
// as its second argument.
if (N1.getValueType() != MVT::i32)
N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
if (N2.getValueType() != MVT::i32)
N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue());
return DAG.getNode(X86ISD::PINSRW, dl, VT, N0, N1, N2);
}
return SDValue();
}
SDValue
X86TargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const {
LLVMContext *Context = DAG.getContext();
DebugLoc dl = Op.getDebugLoc();
EVT OpVT = Op.getValueType();
// If this is a 256-bit vector result, first insert into a 128-bit
// vector and then insert into the 256-bit vector.
if (OpVT.getSizeInBits() > 128) {
// Insert into a 128-bit vector.
EVT VT128 = EVT::getVectorVT(*Context,
OpVT.getVectorElementType(),
OpVT.getVectorNumElements() / 2);
Op = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT128, Op.getOperand(0));
// Insert the 128-bit vector.
return Insert128BitVector(DAG.getUNDEF(OpVT), Op, 0, DAG, dl);
}
if (OpVT == MVT::v1i64 &&
Op.getOperand(0).getValueType() == MVT::i64)
return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v1i64, Op.getOperand(0));
SDValue AnyExt = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, Op.getOperand(0));
assert(OpVT.getSizeInBits() == 128 && "Expected an SSE type!");
return DAG.getNode(ISD::BITCAST, dl, OpVT,
DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32,AnyExt));
}
// Lower a node with an EXTRACT_SUBVECTOR opcode. This may result in
// a simple subregister reference or explicit instructions to grab
// upper bits of a vector.
SDValue
X86TargetLowering::LowerEXTRACT_SUBVECTOR(SDValue Op, SelectionDAG &DAG) const {
if (Subtarget->hasAVX()) {
DebugLoc dl = Op.getNode()->getDebugLoc();
SDValue Vec = Op.getNode()->getOperand(0);
SDValue Idx = Op.getNode()->getOperand(1);
if (Op.getNode()->getValueType(0).getSizeInBits() == 128 &&
Vec.getNode()->getValueType(0).getSizeInBits() == 256 &&
isa<ConstantSDNode>(Idx)) {
unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
return Extract128BitVector(Vec, IdxVal, DAG, dl);
}
}
return SDValue();
}
// Lower a node with an INSERT_SUBVECTOR opcode. This may result in a
// simple superregister reference or explicit instructions to insert
// the upper bits of a vector.
SDValue
X86TargetLowering::LowerINSERT_SUBVECTOR(SDValue Op, SelectionDAG &DAG) const {
if (Subtarget->hasAVX()) {
DebugLoc dl = Op.getNode()->getDebugLoc();
SDValue Vec = Op.getNode()->getOperand(0);
SDValue SubVec = Op.getNode()->getOperand(1);
SDValue Idx = Op.getNode()->getOperand(2);
if (Op.getNode()->getValueType(0).getSizeInBits() == 256 &&
SubVec.getNode()->getValueType(0).getSizeInBits() == 128 &&
isa<ConstantSDNode>(Idx)) {
unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
return Insert128BitVector(Vec, SubVec, IdxVal, DAG, dl);
}
}
return SDValue();
}
// ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
// their target countpart wrapped in the X86ISD::Wrapper node. Suppose N is
// one of the above mentioned nodes. It has to be wrapped because otherwise
// Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
// be used to form addressing mode. These wrapped nodes will be selected
// into MOV32ri.
SDValue
X86TargetLowering::LowerConstantPool(SDValue Op, SelectionDAG &DAG) const {
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
// In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
// global base reg.
unsigned char OpFlag = 0;
unsigned WrapperKind = X86ISD::Wrapper;
CodeModel::Model M = getTargetMachine().getCodeModel();
if (Subtarget->isPICStyleRIPRel() &&
(M == CodeModel::Small || M == CodeModel::Kernel))
WrapperKind = X86ISD::WrapperRIP;
else if (Subtarget->isPICStyleGOT())
OpFlag = X86II::MO_GOTOFF;
else if (Subtarget->isPICStyleStubPIC())
OpFlag = X86II::MO_PIC_BASE_OFFSET;
SDValue Result = DAG.getTargetConstantPool(CP->getConstVal(), getPointerTy(),
CP->getAlignment(),
CP->getOffset(), OpFlag);
DebugLoc DL = CP->getDebugLoc();
Result = DAG.getNode(WrapperKind, DL, getPointerTy(), Result);
// With PIC, the address is actually $g + Offset.
if (OpFlag) {
Result = DAG.getNode(ISD::ADD, DL, getPointerTy(),
DAG.getNode(X86ISD::GlobalBaseReg,
DebugLoc(), getPointerTy()),
Result);
}
return Result;
}
SDValue X86TargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
// In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
// global base reg.
unsigned char OpFlag = 0;
unsigned WrapperKind = X86ISD::Wrapper;
CodeModel::Model M = getTargetMachine().getCodeModel();
if (Subtarget->isPICStyleRIPRel() &&
(M == CodeModel::Small || M == CodeModel::Kernel))
WrapperKind = X86ISD::WrapperRIP;
else if (Subtarget->isPICStyleGOT())
OpFlag = X86II::MO_GOTOFF;
else if (Subtarget->isPICStyleStubPIC())
OpFlag = X86II::MO_PIC_BASE_OFFSET;
SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy(),
OpFlag);
DebugLoc DL = JT->getDebugLoc();
Result = DAG.getNode(WrapperKind, DL, getPointerTy(), Result);
// With PIC, the address is actually $g + Offset.
if (OpFlag)
Result = DAG.getNode(ISD::ADD, DL, getPointerTy(),
DAG.getNode(X86ISD::GlobalBaseReg,
DebugLoc(), getPointerTy()),
Result);
return Result;
}
SDValue
X86TargetLowering::LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const {
const char *Sym = cast<ExternalSymbolSDNode>(Op)->getSymbol();
// In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
// global base reg.
unsigned char OpFlag = 0;
unsigned WrapperKind = X86ISD::Wrapper;
CodeModel::Model M = getTargetMachine().getCodeModel();
if (Subtarget->isPICStyleRIPRel() &&
(M == CodeModel::Small || M == CodeModel::Kernel)) {
if (Subtarget->isTargetDarwin() || Subtarget->isTargetELF())
OpFlag = X86II::MO_GOTPCREL;
WrapperKind = X86ISD::WrapperRIP;
} else if (Subtarget->isPICStyleGOT()) {
OpFlag = X86II::MO_GOT;
} else if (Subtarget->isPICStyleStubPIC()) {
OpFlag = X86II::MO_DARWIN_NONLAZY_PIC_BASE;
} else if (Subtarget->isPICStyleStubNoDynamic()) {
OpFlag = X86II::MO_DARWIN_NONLAZY;
}
SDValue Result = DAG.getTargetExternalSymbol(Sym, getPointerTy(), OpFlag);
DebugLoc DL = Op.getDebugLoc();
Result = DAG.getNode(WrapperKind, DL, getPointerTy(), Result);
// With PIC, the address is actually $g + Offset.
if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
!Subtarget->is64Bit()) {
Result = DAG.getNode(ISD::ADD, DL, getPointerTy(),
DAG.getNode(X86ISD::GlobalBaseReg,
DebugLoc(), getPointerTy()),
Result);
}
// For symbols that require a load from a stub to get the address, emit the
// load.
if (isGlobalStubReference(OpFlag))
Result = DAG.getLoad(getPointerTy(), DL, DAG.getEntryNode(), Result,
MachinePointerInfo::getGOT(), false, false, false, 0);
return Result;
}
SDValue
X86TargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const {
// Create the TargetBlockAddressAddress node.
unsigned char OpFlags =
Subtarget->ClassifyBlockAddressReference();
CodeModel::Model M = getTargetMachine().getCodeModel();
const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
DebugLoc dl = Op.getDebugLoc();
SDValue Result = DAG.getBlockAddress(BA, getPointerTy(),
/*isTarget=*/true, OpFlags);
if (Subtarget->isPICStyleRIPRel() &&
(M == CodeModel::Small || M == CodeModel::Kernel))
Result = DAG.getNode(X86ISD::WrapperRIP, dl, getPointerTy(), Result);
else
Result = DAG.getNode(X86ISD::Wrapper, dl, getPointerTy(), Result);
// With PIC, the address is actually $g + Offset.
if (isGlobalRelativeToPICBase(OpFlags)) {
Result = DAG.getNode(ISD::ADD, dl, getPointerTy(),
DAG.getNode(X86ISD::GlobalBaseReg, dl, getPointerTy()),
Result);
}
return Result;
}
SDValue
X86TargetLowering::LowerGlobalAddress(const GlobalValue *GV, DebugLoc dl,
int64_t Offset,
SelectionDAG &DAG) const {
// Create the TargetGlobalAddress node, folding in the constant
// offset if it is legal.
unsigned char OpFlags =
Subtarget->ClassifyGlobalReference(GV, getTargetMachine());
CodeModel::Model M = getTargetMachine().getCodeModel();
SDValue Result;
if (OpFlags == X86II::MO_NO_FLAG &&
X86::isOffsetSuitableForCodeModel(Offset, M)) {
// A direct static reference to a global.
Result = DAG.getTargetGlobalAddress(GV, dl, getPointerTy(), Offset);
Offset = 0;
} else {
Result = DAG.getTargetGlobalAddress(GV, dl, getPointerTy(), 0, OpFlags);
}
if (Subtarget->isPICStyleRIPRel() &&
(M == CodeModel::Small || M == CodeModel::Kernel))
Result = DAG.getNode(X86ISD::WrapperRIP, dl, getPointerTy(), Result);
else
Result = DAG.getNode(X86ISD::Wrapper, dl, getPointerTy(), Result);
// With PIC, the address is actually $g + Offset.
if (isGlobalRelativeToPICBase(OpFlags)) {
Result = DAG.getNode(ISD::ADD, dl, getPointerTy(),
DAG.getNode(X86ISD::GlobalBaseReg, dl, getPointerTy()),
Result);
}
// For globals that require a load from a stub to get the address, emit the
// load.
if (isGlobalStubReference(OpFlags))
Result = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), Result,
MachinePointerInfo::getGOT(), false, false, false, 0);
// If there was a non-zero offset that we didn't fold, create an explicit
// addition for it.
if (Offset != 0)
Result = DAG.getNode(ISD::ADD, dl, getPointerTy(), Result,
DAG.getConstant(Offset, getPointerTy()));
return Result;
}
SDValue
X86TargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const {
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
return LowerGlobalAddress(GV, Op.getDebugLoc(), Offset, DAG);
}
static SDValue
GetTLSADDR(SelectionDAG &DAG, SDValue Chain, GlobalAddressSDNode *GA,
SDValue *InFlag, const EVT PtrVT, unsigned ReturnReg,
unsigned char OperandFlags) {
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
DebugLoc dl = GA->getDebugLoc();
SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
GA->getValueType(0),
GA->getOffset(),
OperandFlags);
if (InFlag) {
SDValue Ops[] = { Chain, TGA, *InFlag };
Chain = DAG.getNode(X86ISD::TLSADDR, dl, NodeTys, Ops, 3);
} else {
SDValue Ops[] = { Chain, TGA };
Chain = DAG.getNode(X86ISD::TLSADDR, dl, NodeTys, Ops, 2);
}
// TLSADDR will be codegen'ed as call. Inform MFI that function has calls.
MFI->setAdjustsStack(true);
SDValue Flag = Chain.getValue(1);
return DAG.getCopyFromReg(Chain, dl, ReturnReg, PtrVT, Flag);
}
// Lower ISD::GlobalTLSAddress using the "general dynamic" model, 32 bit
static SDValue
LowerToTLSGeneralDynamicModel32(GlobalAddressSDNode *GA, SelectionDAG &DAG,
const EVT PtrVT) {
SDValue InFlag;
DebugLoc dl = GA->getDebugLoc(); // ? function entry point might be better
SDValue Chain = DAG.getCopyToReg(DAG.getEntryNode(), dl, X86::EBX,
DAG.getNode(X86ISD::GlobalBaseReg,
DebugLoc(), PtrVT), InFlag);
InFlag = Chain.getValue(1);
return GetTLSADDR(DAG, Chain, GA, &InFlag, PtrVT, X86::EAX, X86II::MO_TLSGD);
}
// Lower ISD::GlobalTLSAddress using the "general dynamic" model, 64 bit
static SDValue
LowerToTLSGeneralDynamicModel64(GlobalAddressSDNode *GA, SelectionDAG &DAG,
const EVT PtrVT) {
return GetTLSADDR(DAG, DAG.getEntryNode(), GA, NULL, PtrVT,
X86::RAX, X86II::MO_TLSGD);
}
// Lower ISD::GlobalTLSAddress using the "initial exec" (for no-pic) or
// "local exec" model.
static SDValue LowerToTLSExecModel(GlobalAddressSDNode *GA, SelectionDAG &DAG,
const EVT PtrVT, TLSModel::Model model,
bool is64Bit) {
DebugLoc dl = GA->getDebugLoc();
// Get the Thread Pointer, which is %gs:0 (32-bit) or %fs:0 (64-bit).
Value *Ptr = Constant::getNullValue(Type::getInt8PtrTy(*DAG.getContext(),
is64Bit ? 257 : 256));
SDValue ThreadPointer = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
DAG.getIntPtrConstant(0),
MachinePointerInfo(Ptr),
false, false, false, 0);
unsigned char OperandFlags = 0;
// Most TLS accesses are not RIP relative, even on x86-64. One exception is
// initialexec.
unsigned WrapperKind = X86ISD::Wrapper;
if (model == TLSModel::LocalExec) {
OperandFlags = is64Bit ? X86II::MO_TPOFF : X86II::MO_NTPOFF;
} else if (is64Bit) {
assert(model == TLSModel::InitialExec);
OperandFlags = X86II::MO_GOTTPOFF;
WrapperKind = X86ISD::WrapperRIP;
} else {
assert(model == TLSModel::InitialExec);
OperandFlags = X86II::MO_INDNTPOFF;
}
// emit "addl x@ntpoff,%eax" (local exec) or "addl x@indntpoff,%eax" (initial
// exec)
SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
GA->getValueType(0),
GA->getOffset(), OperandFlags);
SDValue Offset = DAG.getNode(WrapperKind, dl, PtrVT, TGA);
if (model == TLSModel::InitialExec)
Offset = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Offset,
MachinePointerInfo::getGOT(), false, false, false, 0);
// The address of the thread local variable is the add of the thread
// pointer with the offset of the variable.
return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
}
SDValue
X86TargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
const GlobalValue *GV = GA->getGlobal();
if (Subtarget->isTargetELF()) {
// TODO: implement the "local dynamic" model
// TODO: implement the "initial exec"model for pic executables
// If GV is an alias then use the aliasee for determining
// thread-localness.
if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
GV = GA->resolveAliasedGlobal(false);
TLSModel::Model model = getTargetMachine().getTLSModel(GV);
switch (model) {
case TLSModel::GeneralDynamic:
case TLSModel::LocalDynamic: // not implemented
if (Subtarget->is64Bit())
return LowerToTLSGeneralDynamicModel64(GA, DAG, getPointerTy());
return LowerToTLSGeneralDynamicModel32(GA, DAG, getPointerTy());
case TLSModel::InitialExec:
case TLSModel::LocalExec:
return LowerToTLSExecModel(GA, DAG, getPointerTy(), model,
Subtarget->is64Bit());
}
llvm_unreachable("Unknown TLS model.");
}
if (Subtarget->isTargetDarwin()) {
// Darwin only has one model of TLS. Lower to that.
unsigned char OpFlag = 0;
unsigned WrapperKind = Subtarget->isPICStyleRIPRel() ?
X86ISD::WrapperRIP : X86ISD::Wrapper;
// In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
// global base reg.
bool PIC32 = (getTargetMachine().getRelocationModel() == Reloc::PIC_) &&
!Subtarget->is64Bit();
if (PIC32)
OpFlag = X86II::MO_TLVP_PIC_BASE;
else
OpFlag = X86II::MO_TLVP;
DebugLoc DL = Op.getDebugLoc();
SDValue Result = DAG.getTargetGlobalAddress(GA->getGlobal(), DL,
GA->getValueType(0),
GA->getOffset(), OpFlag);
SDValue Offset = DAG.getNode(WrapperKind, DL, getPointerTy(), Result);
// With PIC32, the address is actually $g + Offset.
if (PIC32)
Offset = DAG.getNode(ISD::ADD, DL, getPointerTy(),
DAG.getNode(X86ISD::GlobalBaseReg,
DebugLoc(), getPointerTy()),
Offset);
// Lowering the machine isd will make sure everything is in the right
// location.
SDValue Chain = DAG.getEntryNode();
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue Args[] = { Chain, Offset };
Chain = DAG.getNode(X86ISD::TLSCALL, DL, NodeTys, Args, 2);
// TLSCALL will be codegen'ed as call. Inform MFI that function has calls.
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
MFI->setAdjustsStack(true);
// And our return value (tls address) is in the standard call return value
// location.
unsigned Reg = Subtarget->is64Bit() ? X86::RAX : X86::EAX;
return DAG.getCopyFromReg(Chain, DL, Reg, getPointerTy(),
Chain.getValue(1));
}
if (Subtarget->isTargetWindows()) {
// Just use the implicit TLS architecture
// Need to generate someting similar to:
// mov rdx, qword [gs:abs 58H]; Load pointer to ThreadLocalStorage
// ; from TEB
// mov ecx, dword [rel _tls_index]: Load index (from C runtime)
// mov rcx, qword [rdx+rcx*8]
// mov eax, .tls$:tlsvar
// [rax+rcx] contains the address
// Windows 64bit: gs:0x58
// Windows 32bit: fs:__tls_array
// If GV is an alias then use the aliasee for determining
// thread-localness.
if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
GV = GA->resolveAliasedGlobal(false);
DebugLoc dl = GA->getDebugLoc();
SDValue Chain = DAG.getEntryNode();
// Get the Thread Pointer, which is %fs:__tls_array (32-bit) or
// %gs:0x58 (64-bit).
Value *Ptr = Constant::getNullValue(Subtarget->is64Bit()
? Type::getInt8PtrTy(*DAG.getContext(),
256)
: Type::getInt32PtrTy(*DAG.getContext(),
257));
SDValue ThreadPointer = DAG.getLoad(getPointerTy(), dl, Chain,
Subtarget->is64Bit()
? DAG.getIntPtrConstant(0x58)
: DAG.getExternalSymbol("_tls_array",
getPointerTy()),
MachinePointerInfo(Ptr),
false, false, false, 0);
// Load the _tls_index variable
SDValue IDX = DAG.getExternalSymbol("_tls_index", getPointerTy());
if (Subtarget->is64Bit())
IDX = DAG.getExtLoad(ISD::ZEXTLOAD, dl, getPointerTy(), Chain,
IDX, MachinePointerInfo(), MVT::i32,
false, false, 0);
else
IDX = DAG.getLoad(getPointerTy(), dl, Chain, IDX, MachinePointerInfo(),
false, false, false, 0);
SDValue Scale = DAG.getConstant(Log2_64_Ceil(TD->getPointerSize()),
getPointerTy());
IDX = DAG.getNode(ISD::SHL, dl, getPointerTy(), IDX, Scale);
SDValue res = DAG.getNode(ISD::ADD, dl, getPointerTy(), ThreadPointer, IDX);
res = DAG.getLoad(getPointerTy(), dl, Chain, res, MachinePointerInfo(),
false, false, false, 0);
// Get the offset of start of .tls section
SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
GA->getValueType(0),
GA->getOffset(), X86II::MO_SECREL);
SDValue Offset = DAG.getNode(X86ISD::Wrapper, dl, getPointerTy(), TGA);
// The address of the thread local variable is the add of the thread
// pointer with the offset of the variable.
return DAG.getNode(ISD::ADD, dl, getPointerTy(), res, Offset);
}
llvm_unreachable("TLS not implemented for this target.");
}
/// LowerShiftParts - Lower SRA_PARTS and friends, which return two i32 values
/// and take a 2 x i32 value to shift plus a shift amount.
SDValue X86TargetLowering::LowerShiftParts(SDValue Op, SelectionDAG &DAG) const{
assert(Op.getNumOperands() == 3 && "Not a double-shift!");
EVT VT = Op.getValueType();
unsigned VTBits = VT.getSizeInBits();
DebugLoc dl = Op.getDebugLoc();
bool isSRA = Op.getOpcode() == ISD::SRA_PARTS;
SDValue ShOpLo = Op.getOperand(0);
SDValue ShOpHi = Op.getOperand(1);
SDValue ShAmt = Op.getOperand(2);
SDValue Tmp1 = isSRA ? DAG.getNode(ISD::SRA, dl, VT, ShOpHi,
DAG.getConstant(VTBits - 1, MVT::i8))
: DAG.getConstant(0, VT);
SDValue Tmp2, Tmp3;
if (Op.getOpcode() == ISD::SHL_PARTS) {
Tmp2 = DAG.getNode(X86ISD::SHLD, dl, VT, ShOpHi, ShOpLo, ShAmt);
Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt);
} else {
Tmp2 = DAG.getNode(X86ISD::SHRD, dl, VT, ShOpLo, ShOpHi, ShAmt);
Tmp3 = DAG.getNode(isSRA ? ISD::SRA : ISD::SRL, dl, VT, ShOpHi, ShAmt);
}
SDValue AndNode = DAG.getNode(ISD::AND, dl, MVT::i8, ShAmt,
DAG.getConstant(VTBits, MVT::i8));
SDValue Cond = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
AndNode, DAG.getConstant(0, MVT::i8));
SDValue Hi, Lo;
SDValue CC = DAG.getConstant(X86::COND_NE, MVT::i8);
SDValue Ops0[4] = { Tmp2, Tmp3, CC, Cond };
SDValue Ops1[4] = { Tmp3, Tmp1, CC, Cond };
if (Op.getOpcode() == ISD::SHL_PARTS) {
Hi = DAG.getNode(X86ISD::CMOV, dl, VT, Ops0, 4);
Lo = DAG.getNode(X86ISD::CMOV, dl, VT, Ops1, 4);
} else {
Lo = DAG.getNode(X86ISD::CMOV, dl, VT, Ops0, 4);
Hi = DAG.getNode(X86ISD::CMOV, dl, VT, Ops1, 4);
}
SDValue Ops[2] = { Lo, Hi };
return DAG.getMergeValues(Ops, 2, dl);
}
SDValue X86TargetLowering::LowerSINT_TO_FP(SDValue Op,
SelectionDAG &DAG) const {
EVT SrcVT = Op.getOperand(0).getValueType();
if (SrcVT.isVector())
return SDValue();
assert(SrcVT.getSimpleVT() <= MVT::i64 && SrcVT.getSimpleVT() >= MVT::i16 &&
"Unknown SINT_TO_FP to lower!");
// These are really Legal; return the operand so the caller accepts it as
// Legal.
if (SrcVT == MVT::i32 && isScalarFPTypeInSSEReg(Op.getValueType()))
return Op;
if (SrcVT == MVT::i64 && isScalarFPTypeInSSEReg(Op.getValueType()) &&
Subtarget->is64Bit()) {
return Op;
}
DebugLoc dl = Op.getDebugLoc();
unsigned Size = SrcVT.getSizeInBits()/8;
MachineFunction &MF = DAG.getMachineFunction();
int SSFI = MF.getFrameInfo()->CreateStackObject(Size, Size, false);
SDValue StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
SDValue Chain = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
StackSlot,
MachinePointerInfo::getFixedStack(SSFI),
false, false, 0);
return BuildFILD(Op, SrcVT, Chain, StackSlot, DAG);
}
SDValue X86TargetLowering::BuildFILD(SDValue Op, EVT SrcVT, SDValue Chain,
SDValue StackSlot,
SelectionDAG &DAG) const {
// Build the FILD
DebugLoc DL = Op.getDebugLoc();
SDVTList Tys;
bool useSSE = isScalarFPTypeInSSEReg(Op.getValueType());
if (useSSE)
Tys = DAG.getVTList(MVT::f64, MVT::Other, MVT::Glue);
else
Tys = DAG.getVTList(Op.getValueType(), MVT::Other);
unsigned ByteSize = SrcVT.getSizeInBits()/8;
FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(StackSlot);
MachineMemOperand *MMO;
if (FI) {
int SSFI = FI->getIndex();
MMO =
DAG.getMachineFunction()
.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOLoad, ByteSize, ByteSize);
} else {
MMO = cast<LoadSDNode>(StackSlot)->getMemOperand();
StackSlot = StackSlot.getOperand(1);
}
SDValue Ops[] = { Chain, StackSlot, DAG.getValueType(SrcVT) };
SDValue Result = DAG.getMemIntrinsicNode(useSSE ? X86ISD::FILD_FLAG :
X86ISD::FILD, DL,
Tys, Ops, array_lengthof(Ops),
SrcVT, MMO);
if (useSSE) {
Chain = Result.getValue(1);
SDValue InFlag = Result.getValue(2);
// FIXME: Currently the FST is flagged to the FILD_FLAG. This
// shouldn't be necessary except that RFP cannot be live across
// multiple blocks. When stackifier is fixed, they can be uncoupled.
MachineFunction &MF = DAG.getMachineFunction();
unsigned SSFISize = Op.getValueType().getSizeInBits()/8;
int SSFI = MF.getFrameInfo()->CreateStackObject(SSFISize, SSFISize, false);
SDValue StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
Tys = DAG.getVTList(MVT::Other);
SDValue Ops[] = {
Chain, Result, StackSlot, DAG.getValueType(Op.getValueType()), InFlag
};
MachineMemOperand *MMO =
DAG.getMachineFunction()
.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOStore, SSFISize, SSFISize);
Chain = DAG.getMemIntrinsicNode(X86ISD::FST, DL, Tys,
Ops, array_lengthof(Ops),
Op.getValueType(), MMO);
Result = DAG.getLoad(Op.getValueType(), DL, Chain, StackSlot,
MachinePointerInfo::getFixedStack(SSFI),
false, false, false, 0);
}
return Result;
}
// LowerUINT_TO_FP_i64 - 64-bit unsigned integer to double expansion.
SDValue X86TargetLowering::LowerUINT_TO_FP_i64(SDValue Op,
SelectionDAG &DAG) const {
// This algorithm is not obvious. Here it is what we're trying to output:
/*
movq %rax, %xmm0
punpckldq (c0), %xmm0 // c0: (uint4){ 0x43300000U, 0x45300000U, 0U, 0U }
subpd (c1), %xmm0 // c1: (double2){ 0x1.0p52, 0x1.0p52 * 0x1.0p32 }
#ifdef __SSE3__
haddpd %xmm0, %xmm0
#else
pshufd $0x4e, %xmm0, %xmm1
addpd %xmm1, %xmm0
#endif
*/
DebugLoc dl = Op.getDebugLoc();
LLVMContext *Context = DAG.getContext();
// Build some magic constants.
const uint32_t CV0[] = { 0x43300000, 0x45300000, 0, 0 };
Constant *C0 = ConstantDataVector::get(*Context, CV0);
SDValue CPIdx0 = DAG.getConstantPool(C0, getPointerTy(), 16);
SmallVector<Constant*,2> CV1;
CV1.push_back(
ConstantFP::get(*Context, APFloat(APInt(64, 0x4330000000000000ULL))));
CV1.push_back(
ConstantFP::get(*Context, APFloat(APInt(64, 0x4530000000000000ULL))));
Constant *C1 = ConstantVector::get(CV1);
SDValue CPIdx1 = DAG.getConstantPool(C1, getPointerTy(), 16);
// Load the 64-bit value into an XMM register.
SDValue XR1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64,
Op.getOperand(0));
SDValue CLod0 = DAG.getLoad(MVT::v4i32, dl, DAG.getEntryNode(), CPIdx0,
MachinePointerInfo::getConstantPool(),
false, false, false, 16);
SDValue Unpck1 = getUnpackl(DAG, dl, MVT::v4i32,
DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, XR1),
CLod0);
SDValue CLod1 = DAG.getLoad(MVT::v2f64, dl, CLod0.getValue(1), CPIdx1,
MachinePointerInfo::getConstantPool(),
false, false, false, 16);
SDValue XR2F = DAG.getNode(ISD::BITCAST, dl, MVT::v2f64, Unpck1);
SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::v2f64, XR2F, CLod1);
SDValue Result;
if (Subtarget->hasSSE3()) {
// FIXME: The 'haddpd' instruction may be slower than 'movhlps + addsd'.
Result = DAG.getNode(X86ISD::FHADD, dl, MVT::v2f64, Sub, Sub);
} else {
SDValue S2F = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, Sub);
SDValue Shuffle = getTargetShuffleNode(X86ISD::PSHUFD, dl, MVT::v4i32,
S2F, 0x4E, DAG);
Result = DAG.getNode(ISD::FADD, dl, MVT::v2f64,
DAG.getNode(ISD::BITCAST, dl, MVT::v2f64, Shuffle),
Sub);
}
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Result,
DAG.getIntPtrConstant(0));
}
// LowerUINT_TO_FP_i32 - 32-bit unsigned integer to float expansion.
SDValue X86TargetLowering::LowerUINT_TO_FP_i32(SDValue Op,
SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
// FP constant to bias correct the final result.
SDValue Bias = DAG.getConstantFP(BitsToDouble(0x4330000000000000ULL),
MVT::f64);
// Load the 32-bit value into an XMM register.
SDValue Load = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32,
Op.getOperand(0));
// Zero out the upper parts of the register.
Load = getShuffleVectorZeroOrUndef(Load, 0, true, Subtarget, DAG);
Load = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
DAG.getNode(ISD::BITCAST, dl, MVT::v2f64, Load),
DAG.getIntPtrConstant(0));
// Or the load with the bias.
SDValue Or = DAG.getNode(ISD::OR, dl, MVT::v2i64,
DAG.getNode(ISD::BITCAST, dl, MVT::v2i64,
DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
MVT::v2f64, Load)),
DAG.getNode(ISD::BITCAST, dl, MVT::v2i64,
DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
MVT::v2f64, Bias)));
Or = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
DAG.getNode(ISD::BITCAST, dl, MVT::v2f64, Or),
DAG.getIntPtrConstant(0));
// Subtract the bias.
SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::f64, Or, Bias);
// Handle final rounding.
EVT DestVT = Op.getValueType();
if (DestVT.bitsLT(MVT::f64))
return DAG.getNode(ISD::FP_ROUND, dl, DestVT, Sub,
DAG.getIntPtrConstant(0));
if (DestVT.bitsGT(MVT::f64))
return DAG.getNode(ISD::FP_EXTEND, dl, DestVT, Sub);
// Handle final rounding.
return Sub;
}
SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op,
SelectionDAG &DAG) const {
SDValue N0 = Op.getOperand(0);
DebugLoc dl = Op.getDebugLoc();
// Since UINT_TO_FP is legal (it's marked custom), dag combiner won't
// optimize it to a SINT_TO_FP when the sign bit is known zero. Perform
// the optimization here.
if (DAG.SignBitIsZero(N0))
return DAG.getNode(ISD::SINT_TO_FP, dl, Op.getValueType(), N0);
EVT SrcVT = N0.getValueType();
EVT DstVT = Op.getValueType();
if (SrcVT == MVT::i64 && DstVT == MVT::f64 && X86ScalarSSEf64)
return LowerUINT_TO_FP_i64(Op, DAG);
if (SrcVT == MVT::i32 && X86ScalarSSEf64)
return LowerUINT_TO_FP_i32(Op, DAG);
if (Subtarget->is64Bit() && SrcVT == MVT::i64 && DstVT == MVT::f32)
return SDValue();
// Make a 64-bit buffer, and use it to build an FILD.
SDValue StackSlot = DAG.CreateStackTemporary(MVT::i64);
if (SrcVT == MVT::i32) {
SDValue WordOff = DAG.getConstant(4, getPointerTy());
SDValue OffsetSlot = DAG.getNode(ISD::ADD, dl,
getPointerTy(), StackSlot, WordOff);
SDValue Store1 = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
StackSlot, MachinePointerInfo(),
false, false, 0);
SDValue Store2 = DAG.getStore(Store1, dl, DAG.getConstant(0, MVT::i32),
OffsetSlot, MachinePointerInfo(),
false, false, 0);
SDValue Fild = BuildFILD(Op, MVT::i64, Store2, StackSlot, DAG);
return Fild;
}
assert(SrcVT == MVT::i64 && "Unexpected type in UINT_TO_FP");
SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
StackSlot, MachinePointerInfo(),
false, false, 0);
// For i64 source, we need to add the appropriate power of 2 if the input
// was negative. This is the same as the optimization in
// DAGTypeLegalizer::ExpandIntOp_UNIT_TO_FP, and for it to be safe here,
// we must be careful to do the computation in x87 extended precision, not
// in SSE. (The generic code can't know it's OK to do this, or how to.)
int SSFI = cast<FrameIndexSDNode>(StackSlot)->getIndex();
MachineMemOperand *MMO =
DAG.getMachineFunction()
.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOLoad, 8, 8);
SDVTList Tys = DAG.getVTList(MVT::f80, MVT::Other);
SDValue Ops[] = { Store, StackSlot, DAG.getValueType(MVT::i64) };
SDValue Fild = DAG.getMemIntrinsicNode(X86ISD::FILD, dl, Tys, Ops, 3,
MVT::i64, MMO);
APInt FF(32, 0x5F800000ULL);
// Check whether the sign bit is set.
SDValue SignSet = DAG.getSetCC(dl, getSetCCResultType(MVT::i64),
Op.getOperand(0), DAG.getConstant(0, MVT::i64),
ISD::SETLT);
// Build a 64 bit pair (0, FF) in the constant pool, with FF in the lo bits.
SDValue FudgePtr = DAG.getConstantPool(
ConstantInt::get(*DAG.getContext(), FF.zext(64)),
getPointerTy());
// Get a pointer to FF if the sign bit was set, or to 0 otherwise.
SDValue Zero = DAG.getIntPtrConstant(0);
SDValue Four = DAG.getIntPtrConstant(4);
SDValue Offset = DAG.getNode(ISD::SELECT, dl, Zero.getValueType(), SignSet,
Zero, Four);
FudgePtr = DAG.getNode(ISD::ADD, dl, getPointerTy(), FudgePtr, Offset);
// Load the value out, extending it from f32 to f80.
// FIXME: Avoid the extend by constructing the right constant pool?
SDValue Fudge = DAG.getExtLoad(ISD::EXTLOAD, dl, MVT::f80, DAG.getEntryNode(),
FudgePtr, MachinePointerInfo::getConstantPool(),
MVT::f32, false, false, 4);
// Extend everything to 80 bits to force it to be done on x87.
SDValue Add = DAG.getNode(ISD::FADD, dl, MVT::f80, Fild, Fudge);
return DAG.getNode(ISD::FP_ROUND, dl, DstVT, Add, DAG.getIntPtrConstant(0));
}
std::pair<SDValue,SDValue> X86TargetLowering::
FP_TO_INTHelper(SDValue Op, SelectionDAG &DAG, bool IsSigned, bool IsReplace) const {
DebugLoc DL = Op.getDebugLoc();
EVT DstTy = Op.getValueType();
if (!IsSigned && !isIntegerTypeFTOL(DstTy)) {
assert(DstTy == MVT::i32 && "Unexpected FP_TO_UINT");
DstTy = MVT::i64;
}
assert(DstTy.getSimpleVT() <= MVT::i64 &&
DstTy.getSimpleVT() >= MVT::i16 &&
"Unknown FP_TO_INT to lower!");
// These are really Legal.
if (DstTy == MVT::i32 &&
isScalarFPTypeInSSEReg(Op.getOperand(0).getValueType()))
return std::make_pair(SDValue(), SDValue());
if (Subtarget->is64Bit() &&
DstTy == MVT::i64 &&
isScalarFPTypeInSSEReg(Op.getOperand(0).getValueType()))
return std::make_pair(SDValue(), SDValue());
// We lower FP->int64 either into FISTP64 followed by a load from a temporary
// stack slot, or into the FTOL runtime function.
MachineFunction &MF = DAG.getMachineFunction();
unsigned MemSize = DstTy.getSizeInBits()/8;
int SSFI = MF.getFrameInfo()->CreateStackObject(MemSize, MemSize, false);
SDValue StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
unsigned Opc;
if (!IsSigned && isIntegerTypeFTOL(DstTy))
Opc = X86ISD::WIN_FTOL;
else
switch (DstTy.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid FP_TO_SINT to lower!");
case MVT::i16: Opc = X86ISD::FP_TO_INT16_IN_MEM; break;
case MVT::i32: Opc = X86ISD::FP_TO_INT32_IN_MEM; break;
case MVT::i64: Opc = X86ISD::FP_TO_INT64_IN_MEM; break;
}
SDValue Chain = DAG.getEntryNode();
SDValue Value = Op.getOperand(0);
EVT TheVT = Op.getOperand(0).getValueType();
// FIXME This causes a redundant load/store if the SSE-class value is already
// in memory, such as if it is on the callstack.
if (isScalarFPTypeInSSEReg(TheVT)) {
assert(DstTy == MVT::i64 && "Invalid FP_TO_SINT to lower!");
Chain = DAG.getStore(Chain, DL, Value, StackSlot,
MachinePointerInfo::getFixedStack(SSFI),
false, false, 0);
SDVTList Tys = DAG.getVTList(Op.getOperand(0).getValueType(), MVT::Other);
SDValue Ops[] = {
Chain, StackSlot, DAG.getValueType(TheVT)
};
MachineMemOperand *MMO =
MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOLoad, MemSize, MemSize);
Value = DAG.getMemIntrinsicNode(X86ISD::FLD, DL, Tys, Ops, 3,
DstTy, MMO);
Chain = Value.getValue(1);
SSFI = MF.getFrameInfo()->CreateStackObject(MemSize, MemSize, false);
StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
}
MachineMemOperand *MMO =
MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOStore, MemSize, MemSize);
if (Opc != X86ISD::WIN_FTOL) {
// Build the FP_TO_INT*_IN_MEM
SDValue Ops[] = { Chain, Value, StackSlot };
SDValue FIST = DAG.getMemIntrinsicNode(Opc, DL, DAG.getVTList(MVT::Other),
Ops, 3, DstTy, MMO);
return std::make_pair(FIST, StackSlot);
} else {
SDValue ftol = DAG.getNode(X86ISD::WIN_FTOL, DL,
DAG.getVTList(MVT::Other, MVT::Glue),
Chain, Value);
SDValue eax = DAG.getCopyFromReg(ftol, DL, X86::EAX,
MVT::i32, ftol.getValue(1));
SDValue edx = DAG.getCopyFromReg(eax.getValue(1), DL, X86::EDX,
MVT::i32, eax.getValue(2));
SDValue Ops[] = { eax, edx };
SDValue pair = IsReplace
? DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, Ops, 2)
: DAG.getMergeValues(Ops, 2, DL);
return std::make_pair(pair, SDValue());
}
}
SDValue X86TargetLowering::LowerFP_TO_SINT(SDValue Op,
SelectionDAG &DAG) const {
if (Op.getValueType().isVector())
return SDValue();
std::pair<SDValue,SDValue> Vals = FP_TO_INTHelper(Op, DAG,
/*IsSigned=*/ true, /*IsReplace=*/ false);
SDValue FIST = Vals.first, StackSlot = Vals.second;
// If FP_TO_INTHelper failed, the node is actually supposed to be Legal.
if (FIST.getNode() == 0) return Op;
if (StackSlot.getNode())
// Load the result.
return DAG.getLoad(Op.getValueType(), Op.getDebugLoc(),
FIST, StackSlot, MachinePointerInfo(),
false, false, false, 0);
// The node is the result.
return FIST;
}
SDValue X86TargetLowering::LowerFP_TO_UINT(SDValue Op,
SelectionDAG &DAG) const {
std::pair<SDValue,SDValue> Vals = FP_TO_INTHelper(Op, DAG,
/*IsSigned=*/ false, /*IsReplace=*/ false);
SDValue FIST = Vals.first, StackSlot = Vals.second;
assert(FIST.getNode() && "Unexpected failure");
if (StackSlot.getNode())
// Load the result.
return DAG.getLoad(Op.getValueType(), Op.getDebugLoc(),
FIST, StackSlot, MachinePointerInfo(),
false, false, false, 0);
// The node is the result.
return FIST;
}
SDValue X86TargetLowering::LowerFABS(SDValue Op,
SelectionDAG &DAG) const {
LLVMContext *Context = DAG.getContext();
DebugLoc dl = Op.getDebugLoc();
EVT VT = Op.getValueType();
EVT EltVT = VT;
if (VT.isVector())
EltVT = VT.getVectorElementType();
Constant *C;
if (EltVT == MVT::f64) {
C = ConstantVector::getSplat(2,
ConstantFP::get(*Context, APFloat(APInt(64, ~(1ULL << 63)))));
} else {
C = ConstantVector::getSplat(4,
ConstantFP::get(*Context, APFloat(APInt(32, ~(1U << 31)))));
}
SDValue CPIdx = DAG.getConstantPool(C, getPointerTy(), 16);
SDValue Mask = DAG.getLoad(VT, dl, DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(),
false, false, false, 16);
return DAG.getNode(X86ISD::FAND, dl, VT, Op.getOperand(0), Mask);
}
SDValue X86TargetLowering::LowerFNEG(SDValue Op, SelectionDAG &DAG) const {
LLVMContext *Context = DAG.getContext();
DebugLoc dl = Op.getDebugLoc();
EVT VT = Op.getValueType();
EVT EltVT = VT;
unsigned NumElts = VT == MVT::f64 ? 2 : 4;
if (VT.isVector()) {
EltVT = VT.getVectorElementType();
NumElts = VT.getVectorNumElements();
}
Constant *C;
if (EltVT == MVT::f64)
C = ConstantFP::get(*Context, APFloat(APInt(64, 1ULL << 63)));
else
C = ConstantFP::get(*Context, APFloat(APInt(32, 1U << 31)));
C = ConstantVector::getSplat(NumElts, C);
SDValue CPIdx = DAG.getConstantPool(C, getPointerTy(), 16);
SDValue Mask = DAG.getLoad(VT, dl, DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(),
false, false, false, 16);
if (VT.isVector()) {
MVT XORVT = VT.getSizeInBits() == 128 ? MVT::v2i64 : MVT::v4i64;
return DAG.getNode(ISD::BITCAST, dl, VT,
DAG.getNode(ISD::XOR, dl, XORVT,
DAG.getNode(ISD::BITCAST, dl, XORVT,
Op.getOperand(0)),
DAG.getNode(ISD::BITCAST, dl, XORVT, Mask)));
}
return DAG.getNode(X86ISD::FXOR, dl, VT, Op.getOperand(0), Mask);
}
SDValue X86TargetLowering::LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const {
LLVMContext *Context = DAG.getContext();
SDValue Op0 = Op.getOperand(0);
SDValue Op1 = Op.getOperand(1);
DebugLoc dl = Op.getDebugLoc();
EVT VT = Op.getValueType();
EVT SrcVT = Op1.getValueType();
// If second operand is smaller, extend it first.
if (SrcVT.bitsLT(VT)) {
Op1 = DAG.getNode(ISD::FP_EXTEND, dl, VT, Op1);
SrcVT = VT;
}
// And if it is bigger, shrink it first.
if (SrcVT.bitsGT(VT)) {
Op1 = DAG.getNode(ISD::FP_ROUND, dl, VT, Op1, DAG.getIntPtrConstant(1));
SrcVT = VT;
}
// At this point the operands and the result should have the same
// type, and that won't be f80 since that is not custom lowered.
// First get the sign bit of second operand.
SmallVector<Constant*,4> CV;
if (SrcVT == MVT::f64) {
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(64, 1ULL << 63))));
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(64, 0))));
} else {
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(32, 1U << 31))));
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(32, 0))));
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(32, 0))));
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(32, 0))));
}
Constant *C = ConstantVector::get(CV);
SDValue CPIdx = DAG.getConstantPool(C, getPointerTy(), 16);
SDValue Mask1 = DAG.getLoad(SrcVT, dl, DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(),
false, false, false, 16);
SDValue SignBit = DAG.getNode(X86ISD::FAND, dl, SrcVT, Op1, Mask1);
// Shift sign bit right or left if the two operands have different types.
if (SrcVT.bitsGT(VT)) {
// Op0 is MVT::f32, Op1 is MVT::f64.
SignBit = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2f64, SignBit);
SignBit = DAG.getNode(X86ISD::FSRL, dl, MVT::v2f64, SignBit,
DAG.getConstant(32, MVT::i32));
SignBit = DAG.getNode(ISD::BITCAST, dl, MVT::v4f32, SignBit);
SignBit = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f32, SignBit,
DAG.getIntPtrConstant(0));
}
// Clear first operand sign bit.
CV.clear();
if (VT == MVT::f64) {
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(64, ~(1ULL << 63)))));
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(64, 0))));
} else {
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(32, ~(1U << 31)))));
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(32, 0))));
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(32, 0))));
CV.push_back(ConstantFP::get(*Context, APFloat(APInt(32, 0))));
}
C = ConstantVector::get(CV);
CPIdx = DAG.getConstantPool(C, getPointerTy(), 16);
SDValue Mask2 = DAG.getLoad(VT, dl, DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(),
false, false, false, 16);
SDValue Val = DAG.getNode(X86ISD::FAND, dl, VT, Op0, Mask2);
// Or the value with the sign bit.
return DAG.getNode(X86ISD::FOR, dl, VT, Val, SignBit);
}
SDValue X86TargetLowering::LowerFGETSIGN(SDValue Op, SelectionDAG &DAG) const {
SDValue N0 = Op.getOperand(0);
DebugLoc dl = Op.getDebugLoc();
EVT VT = Op.getValueType();
// Lower ISD::FGETSIGN to (AND (X86ISD::FGETSIGNx86 ...) 1).
SDValue xFGETSIGN = DAG.getNode(X86ISD::FGETSIGNx86, dl, VT, N0,
DAG.getConstant(1, VT));
return DAG.getNode(ISD::AND, dl, VT, xFGETSIGN, DAG.getConstant(1, VT));
}
/// Emit nodes that will be selected as "test Op0,Op0", or something
/// equivalent.
SDValue X86TargetLowering::EmitTest(SDValue Op, unsigned X86CC,
SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
// CF and OF aren't always set the way we want. Determine which
// of these we need.
bool NeedCF = false;
bool NeedOF = false;
switch (X86CC) {
default: break;
case X86::COND_A: case X86::COND_AE:
case X86::COND_B: case X86::COND_BE:
NeedCF = true;
break;
case X86::COND_G: case X86::COND_GE:
case X86::COND_L: case X86::COND_LE:
case X86::COND_O: case X86::COND_NO:
NeedOF = true;
break;
}
// See if we can use the EFLAGS value from the operand instead of
// doing a separate TEST. TEST always sets OF and CF to 0, so unless
// we prove that the arithmetic won't overflow, we can't use OF or CF.
if (Op.getResNo() != 0 || NeedOF || NeedCF)
// Emit a CMP with 0, which is the TEST pattern.
return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op,
DAG.getConstant(0, Op.getValueType()));
unsigned Opcode = 0;
unsigned NumOperands = 0;
switch (Op.getNode()->getOpcode()) {
case ISD::ADD:
// Due to an isel shortcoming, be conservative if this add is likely to be
// selected as part of a load-modify-store instruction. When the root node
// in a match is a store, isel doesn't know how to remap non-chain non-flag
// uses of other nodes in the match, such as the ADD in this case. This
// leads to the ADD being left around and reselected, with the result being
// two adds in the output. Alas, even if none our users are stores, that
// doesn't prove we're O.K. Ergo, if we have any parents that aren't
// CopyToReg or SETCC, eschew INC/DEC. A better fix seems to require
// climbing the DAG back to the root, and it doesn't seem to be worth the
// effort.
for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
UE = Op.getNode()->use_end(); UI != UE; ++UI)
if (UI->getOpcode() != ISD::CopyToReg &&
UI->getOpcode() != ISD::SETCC &&
UI->getOpcode() != ISD::STORE)
goto default_case;
if (ConstantSDNode *C =
dyn_cast<ConstantSDNode>(Op.getNode()->getOperand(1))) {
// An add of one will be selected as an INC.
if (C->getAPIntValue() == 1) {
Opcode = X86ISD::INC;
NumOperands = 1;
break;
}
// An add of negative one (subtract of one) will be selected as a DEC.
if (C->getAPIntValue().isAllOnesValue()) {
Opcode = X86ISD::DEC;
NumOperands = 1;
break;
}
}
// Otherwise use a regular EFLAGS-setting add.
Opcode = X86ISD::ADD;
NumOperands = 2;
break;
case ISD::AND: {
// If the primary and result isn't used, don't bother using X86ISD::AND,
// because a TEST instruction will be better.
bool NonFlagUse = false;
for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
UE = Op.getNode()->use_end(); UI != UE; ++UI) {
SDNode *User = *UI;
unsigned UOpNo = UI.getOperandNo();
if (User->getOpcode() == ISD::TRUNCATE && User->hasOneUse()) {
// Look pass truncate.
UOpNo = User->use_begin().getOperandNo();
User = *User->use_begin();
}
if (User->getOpcode() != ISD::BRCOND &&
User->getOpcode() != ISD::SETCC &&
(User->getOpcode() != ISD::SELECT || UOpNo != 0)) {
NonFlagUse = true;
break;
}
}
if (!NonFlagUse)
break;
}
// FALL THROUGH
case ISD::SUB:
case ISD::OR:
case ISD::XOR:
// Due to the ISEL shortcoming noted above, be conservative if this op is
// likely to be selected as part of a load-modify-store instruction.
for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
UE = Op.getNode()->use_end(); UI != UE; ++UI)
if (UI->getOpcode() == ISD::STORE)
goto default_case;
// Otherwise use a regular EFLAGS-setting instruction.
switch (Op.getNode()->getOpcode()) {
default: llvm_unreachable("unexpected operator!");
case ISD::SUB: Opcode = X86ISD::SUB; break;
case ISD::OR: Opcode = X86ISD::OR; break;
case ISD::XOR: Opcode = X86ISD::XOR; break;
case ISD::AND: Opcode = X86ISD::AND; break;
}
NumOperands = 2;
break;
case X86ISD::ADD:
case X86ISD::SUB:
case X86ISD::INC:
case X86ISD::DEC:
case X86ISD::OR:
case X86ISD::XOR:
case X86ISD::AND:
return SDValue(Op.getNode(), 1);
default:
default_case:
break;
}
if (Opcode == 0)
// Emit a CMP with 0, which is the TEST pattern.
return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op,
DAG.getConstant(0, Op.getValueType()));
SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
SmallVector<SDValue, 4> Ops;
for (unsigned i = 0; i != NumOperands; ++i)
Ops.push_back(Op.getOperand(i));
SDValue New = DAG.getNode(Opcode, dl, VTs, &Ops[0], NumOperands);
DAG.ReplaceAllUsesWith(Op, New);
return SDValue(New.getNode(), 1);
}
/// Emit nodes that will be selected as "cmp Op0,Op1", or something
/// equivalent.
SDValue X86TargetLowering::EmitCmp(SDValue Op0, SDValue Op1, unsigned X86CC,
SelectionDAG &DAG) const {
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op1))
if (C->getAPIntValue() == 0)
return EmitTest(Op0, X86CC, DAG);
DebugLoc dl = Op0.getDebugLoc();
return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op0, Op1);
}
/// Convert a comparison if required by the subtarget.
SDValue X86TargetLowering::ConvertCmpIfNecessary(SDValue Cmp,
SelectionDAG &DAG) const {
// If the subtarget does not support the FUCOMI instruction, floating-point
// comparisons have to be converted.
if (Subtarget->hasCMov() ||
Cmp.getOpcode() != X86ISD::CMP ||
!Cmp.getOperand(0).getValueType().isFloatingPoint() ||
!Cmp.getOperand(1).getValueType().isFloatingPoint())
return Cmp;
// The instruction selector will select an FUCOM instruction instead of
// FUCOMI, which writes the comparison result to FPSW instead of EFLAGS. Hence
// build an SDNode sequence that transfers the result from FPSW into EFLAGS:
// (X86sahf (trunc (srl (X86fp_stsw (trunc (X86cmp ...)), 8))))
DebugLoc dl = Cmp.getDebugLoc();
SDValue TruncFPSW = DAG.getNode(ISD::TRUNCATE, dl, MVT::i16, Cmp);
SDValue FNStSW = DAG.getNode(X86ISD::FNSTSW16r, dl, MVT::i16, TruncFPSW);
SDValue Srl = DAG.getNode(ISD::SRL, dl, MVT::i16, FNStSW,
DAG.getConstant(8, MVT::i8));
SDValue TruncSrl = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Srl);
return DAG.getNode(X86ISD::SAHF, dl, MVT::i32, TruncSrl);
}
/// LowerToBT - Result of 'and' is compared against zero. Turn it into a BT node
/// if it's possible.
SDValue X86TargetLowering::LowerToBT(SDValue And, ISD::CondCode CC,
DebugLoc dl, SelectionDAG &DAG) const {
SDValue Op0 = And.getOperand(0);
SDValue Op1 = And.getOperand(1);
if (Op0.getOpcode() == ISD::TRUNCATE)
Op0 = Op0.getOperand(0);
if (Op1.getOpcode() == ISD::TRUNCATE)
Op1 = Op1.getOperand(0);
SDValue LHS, RHS;
if (Op1.getOpcode() == ISD::SHL)
std::swap(Op0, Op1);
if (Op0.getOpcode() == ISD::SHL) {
if (ConstantSDNode *And00C = dyn_cast<ConstantSDNode>(Op0.getOperand(0)))
if (And00C->getZExtValue() == 1) {
// If we looked past a truncate, check that it's only truncating away
// known zeros.
unsigned BitWidth = Op0.getValueSizeInBits();
unsigned AndBitWidth = And.getValueSizeInBits();
if (BitWidth > AndBitWidth) {
APInt Zeros, Ones;
DAG.ComputeMaskedBits(Op0, Zeros, Ones);
if (Zeros.countLeadingOnes() < BitWidth - AndBitWidth)
return SDValue();
}
LHS = Op1;
RHS = Op0.getOperand(1);
}
} else if (Op1.getOpcode() == ISD::Constant) {
ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op1);
uint64_t AndRHSVal = AndRHS->getZExtValue();
SDValue AndLHS = Op0;
if (AndRHSVal == 1 && AndLHS.getOpcode() == ISD::SRL) {
LHS = AndLHS.getOperand(0);
RHS = AndLHS.getOperand(1);
}
// Use BT if the immediate can't be encoded in a TEST instruction.
if (!isUInt<32>(AndRHSVal) && isPowerOf2_64(AndRHSVal)) {
LHS = AndLHS;
RHS = DAG.getConstant(Log2_64_Ceil(AndRHSVal), LHS.getValueType());
}
}
if (LHS.getNode()) {
// If LHS is i8, promote it to i32 with any_extend. There is no i8 BT
// instruction. Since the shift amount is in-range-or-undefined, we know
// that doing a bittest on the i32 value is ok. We extend to i32 because
// the encoding for the i16 version is larger than the i32 version.
// Also promote i16 to i32 for performance / code size reason.
if (LHS.getValueType() == MVT::i8 ||
LHS.getValueType() == MVT::i16)
LHS = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, LHS);
// If the operand types disagree, extend the shift amount to match. Since
// BT ignores high bits (like shifts) we can use anyextend.
if (LHS.getValueType() != RHS.getValueType())
RHS = DAG.getNode(ISD::ANY_EXTEND, dl, LHS.getValueType(), RHS);
SDValue BT = DAG.getNode(X86ISD::BT, dl, MVT::i32, LHS, RHS);
unsigned Cond = CC == ISD::SETEQ ? X86::COND_AE : X86::COND_B;
return DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
DAG.getConstant(Cond, MVT::i8), BT);
}
return SDValue();
}
SDValue X86TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
if (Op.getValueType().isVector()) return LowerVSETCC(Op, DAG);
assert(Op.getValueType() == MVT::i8 && "SetCC type must be 8-bit integer");
SDValue Op0 = Op.getOperand(0);
SDValue Op1 = Op.getOperand(1);
DebugLoc dl = Op.getDebugLoc();
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
// Optimize to BT if possible.
// Lower (X & (1 << N)) == 0 to BT(X, N).
// Lower ((X >>u N) & 1) != 0 to BT(X, N).
// Lower ((X >>s N) & 1) != 0 to BT(X, N).
if (Op0.getOpcode() == ISD::AND && Op0.hasOneUse() &&
Op1.getOpcode() == ISD::Constant &&
cast<ConstantSDNode>(Op1)->isNullValue() &&
(CC == ISD::SETEQ || CC == ISD::SETNE)) {
SDValue NewSetCC = LowerToBT(Op0, CC, dl, DAG);
if (NewSetCC.getNode())
return NewSetCC;
}
// Look for X == 0, X == 1, X != 0, or X != 1. We can simplify some forms of
// these.
if (Op1.getOpcode() == ISD::Constant &&
(cast<ConstantSDNode>(Op1)->getZExtValue() == 1 ||
cast<ConstantSDNode>(Op1)->isNullValue()) &&
(CC == ISD::SETEQ || CC == ISD::SETNE)) {
// If the input is a setcc, then reuse the input setcc or use a new one with
// the inverted condition.
if (Op0.getOpcode() == X86ISD::SETCC) {
X86::CondCode CCode = (X86::CondCode)Op0.getConstantOperandVal(0);
bool Invert = (CC == ISD::SETNE) ^
cast<ConstantSDNode>(Op1)->isNullValue();
if (!Invert) return Op0;
CCode = X86::GetOppositeBranchCondition(CCode);
return DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
DAG.getConstant(CCode, MVT::i8), Op0.getOperand(1));
}
}
bool isFP = Op1.getValueType().isFloatingPoint();
unsigned X86CC = TranslateX86CC(CC, isFP, Op0, Op1, DAG);
if (X86CC == X86::COND_INVALID)
return SDValue();
SDValue EFLAGS = EmitCmp(Op0, Op1, X86CC, DAG);
EFLAGS = ConvertCmpIfNecessary(EFLAGS, DAG);
return DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
DAG.getConstant(X86CC, MVT::i8), EFLAGS);
}
// Lower256IntVSETCC - Break a VSETCC 256-bit integer VSETCC into two new 128
// ones, and then concatenate the result back.
static SDValue Lower256IntVSETCC(SDValue Op, SelectionDAG &DAG) {
EVT VT = Op.getValueType();
assert(VT.getSizeInBits() == 256 && Op.getOpcode() == ISD::SETCC &&
"Unsupported value type for operation");
unsigned NumElems = VT.getVectorNumElements();
DebugLoc dl = Op.getDebugLoc();
SDValue CC = Op.getOperand(2);
// Extract the LHS vectors
SDValue LHS = Op.getOperand(0);
SDValue LHS1 = Extract128BitVector(LHS, 0, DAG, dl);
SDValue LHS2 = Extract128BitVector(LHS, NumElems/2, DAG, dl);
// Extract the RHS vectors
SDValue RHS = Op.getOperand(1);
SDValue RHS1 = Extract128BitVector(RHS, 0, DAG, dl);
SDValue RHS2 = Extract128BitVector(RHS, NumElems/2, DAG, dl);
// Issue the operation on the smaller types and concatenate the result back
MVT EltVT = VT.getVectorElementType().getSimpleVT();
EVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
DAG.getNode(Op.getOpcode(), dl, NewVT, LHS1, RHS1, CC),
DAG.getNode(Op.getOpcode(), dl, NewVT, LHS2, RHS2, CC));
}
SDValue X86TargetLowering::LowerVSETCC(SDValue Op, SelectionDAG &DAG) const {
SDValue Cond;
SDValue Op0 = Op.getOperand(0);
SDValue Op1 = Op.getOperand(1);
SDValue CC = Op.getOperand(2);
EVT VT = Op.getValueType();
ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
bool isFP = Op.getOperand(1).getValueType().isFloatingPoint();
DebugLoc dl = Op.getDebugLoc();
if (isFP) {
unsigned SSECC = 8;
EVT EltVT = Op0.getValueType().getVectorElementType();
assert(EltVT == MVT::f32 || EltVT == MVT::f64); (void)EltVT;
bool Swap = false;
// SSE Condition code mapping:
// 0 - EQ
// 1 - LT
// 2 - LE
// 3 - UNORD
// 4 - NEQ
// 5 - NLT
// 6 - NLE
// 7 - ORD
switch (SetCCOpcode) {
default: break;
case ISD::SETOEQ:
case ISD::SETEQ: SSECC = 0; break;
case ISD::SETOGT:
case ISD::SETGT: Swap = true; // Fallthrough
case ISD::SETLT:
case ISD::SETOLT: SSECC = 1; break;
case ISD::SETOGE:
case ISD::SETGE: Swap = true; // Fallthrough
case ISD::SETLE:
case ISD::SETOLE: SSECC = 2; break;
case ISD::SETUO: SSECC = 3; break;
case ISD::SETUNE:
case ISD::SETNE: SSECC = 4; break;
case ISD::SETULE: Swap = true;
case ISD::SETUGE: SSECC = 5; break;
case ISD::SETULT: Swap = true;
case ISD::SETUGT: SSECC = 6; break;
case ISD::SETO: SSECC = 7; break;
}
if (Swap)
std::swap(Op0, Op1);
// In the two special cases we can't handle, emit two comparisons.
if (SSECC == 8) {
if (SetCCOpcode == ISD::SETUEQ) {
SDValue UNORD, EQ;
UNORD = DAG.getNode(X86ISD::CMPP, dl, VT, Op0, Op1,
DAG.getConstant(3, MVT::i8));
EQ = DAG.getNode(X86ISD::CMPP, dl, VT, Op0, Op1,
DAG.getConstant(0, MVT::i8));
return DAG.getNode(ISD::OR, dl, VT, UNORD, EQ);
}
if (SetCCOpcode == ISD::SETONE) {
SDValue ORD, NEQ;
ORD = DAG.getNode(X86ISD::CMPP, dl, VT, Op0, Op1,
DAG.getConstant(7, MVT::i8));
NEQ = DAG.getNode(X86ISD::CMPP, dl, VT, Op0, Op1,
DAG.getConstant(4, MVT::i8));
return DAG.getNode(ISD::AND, dl, VT, ORD, NEQ);
}
llvm_unreachable("Illegal FP comparison");
}
// Handle all other FP comparisons here.
return DAG.getNode(X86ISD::CMPP, dl, VT, Op0, Op1,
DAG.getConstant(SSECC, MVT::i8));
}
// Break 256-bit integer vector compare into smaller ones.
if (VT.getSizeInBits() == 256 && !Subtarget->hasAVX2())
return Lower256IntVSETCC(Op, DAG);
// We are handling one of the integer comparisons here. Since SSE only has
// GT and EQ comparisons for integer, swapping operands and multiple
// operations may be required for some comparisons.
unsigned Opc = 0;
bool Swap = false, Invert = false, FlipSigns = false;
switch (SetCCOpcode) {
default: break;
case ISD::SETNE: Invert = true;
case ISD::SETEQ: Opc = X86ISD::PCMPEQ; break;
case ISD::SETLT: Swap = true;
case ISD::SETGT: Opc = X86ISD::PCMPGT; break;
case ISD::SETGE: Swap = true;
case ISD::SETLE: Opc = X86ISD::PCMPGT; Invert = true; break;
case ISD::SETULT: Swap = true;
case ISD::SETUGT: Opc = X86ISD::PCMPGT; FlipSigns = true; break;
case ISD::SETUGE: Swap = true;
case ISD::SETULE: Opc = X86ISD::PCMPGT; FlipSigns = true; Invert = true; break;
}
if (Swap)
std::swap(Op0, Op1);
// Check that the operation in question is available (most are plain SSE2,
// but PCMPGTQ and PCMPEQQ have different requirements).
if (Opc == X86ISD::PCMPGT && VT == MVT::v2i64 && !Subtarget->hasSSE42())
return SDValue();
if (Opc == X86ISD::PCMPEQ && VT == MVT::v2i64 && !Subtarget->hasSSE41())
return SDValue();
// Since SSE has no unsigned integer comparisons, we need to flip the sign
// bits of the inputs before performing those operations.
if (FlipSigns) {
EVT EltVT = VT.getVectorElementType();
SDValue SignBit = DAG.getConstant(APInt::getSignBit(EltVT.getSizeInBits()),
EltVT);
std::vector<SDValue> SignBits(VT.getVectorNumElements(), SignBit);
SDValue SignVec = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &SignBits[0],
SignBits.size());
Op0 = DAG.getNode(ISD::XOR, dl, VT, Op0, SignVec);
Op1 = DAG.getNode(ISD::XOR, dl, VT, Op1, SignVec);
}
SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
// If the logical-not of the result is required, perform that now.
if (Invert)
Result = DAG.getNOT(dl, Result, VT);
return Result;
}
// isX86LogicalCmp - Return true if opcode is a X86 logical comparison.
static bool isX86LogicalCmp(SDValue Op) {
unsigned Opc = Op.getNode()->getOpcode();
if (Opc == X86ISD::CMP || Opc == X86ISD::COMI || Opc == X86ISD::UCOMI ||
Opc == X86ISD::SAHF)
return true;
if (Op.getResNo() == 1 &&
(Opc == X86ISD::ADD ||
Opc == X86ISD::SUB ||
Opc == X86ISD::ADC ||
Opc == X86ISD::SBB ||
Opc == X86ISD::SMUL ||
Opc == X86ISD::UMUL ||
Opc == X86ISD::INC ||
Opc == X86ISD::DEC ||
Opc == X86ISD::OR ||
Opc == X86ISD::XOR ||
Opc == X86ISD::AND))
return true;
if (Op.getResNo() == 2 && Opc == X86ISD::UMUL)
return true;
return false;
}
static bool isZero(SDValue V) {
ConstantSDNode *C = dyn_cast<ConstantSDNode>(V);
return C && C->isNullValue();
}
static bool isAllOnes(SDValue V) {
ConstantSDNode *C = dyn_cast<ConstantSDNode>(V);
return C && C->isAllOnesValue();
}
SDValue X86TargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const {
bool addTest = true;
SDValue Cond = Op.getOperand(0);
SDValue Op1 = Op.getOperand(1);
SDValue Op2 = Op.getOperand(2);
DebugLoc DL = Op.getDebugLoc();
SDValue CC;
if (Cond.getOpcode() == ISD::SETCC) {
SDValue NewCond = LowerSETCC(Cond, DAG);
if (NewCond.getNode())
Cond = NewCond;
}
// Handle the following cases related to max and min:
// (a > b) ? (a-b) : 0
// (a >= b) ? (a-b) : 0
// (b < a) ? (a-b) : 0
// (b <= a) ? (a-b) : 0
// Comparison is removed to use EFLAGS from SUB.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op2))
if (Cond.getOpcode() == X86ISD::SETCC &&
Cond.getOperand(1).getOpcode() == X86ISD::CMP &&
(Op1.getOpcode() == ISD::SUB || Op1.getOpcode() == X86ISD::SUB) &&
C->getAPIntValue() == 0) {
SDValue Cmp = Cond.getOperand(1);
unsigned CC = cast<ConstantSDNode>(Cond.getOperand(0))->getZExtValue();
if ((DAG.isEqualTo(Op1.getOperand(0), Cmp.getOperand(0)) &&
DAG.isEqualTo(Op1.getOperand(1), Cmp.getOperand(1)) &&
(CC == X86::COND_G || CC == X86::COND_GE ||
CC == X86::COND_A || CC == X86::COND_AE)) ||
(DAG.isEqualTo(Op1.getOperand(0), Cmp.getOperand(1)) &&
DAG.isEqualTo(Op1.getOperand(1), Cmp.getOperand(0)) &&
(CC == X86::COND_L || CC == X86::COND_LE ||
CC == X86::COND_B || CC == X86::COND_BE))) {
if (Op1.getOpcode() == ISD::SUB) {
SDVTList VTs = DAG.getVTList(Op1.getValueType(), MVT::i32);
SDValue New = DAG.getNode(X86ISD::SUB, DL, VTs,
Op1.getOperand(0), Op1.getOperand(1));
DAG.ReplaceAllUsesWith(Op1, New);
Op1 = New;
}
SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
unsigned NewCC = (CC == X86::COND_G || CC == X86::COND_GE ||
CC == X86::COND_L ||
CC == X86::COND_LE) ? X86::COND_GE : X86::COND_AE;
SDValue Ops[] = { Op2, Op1, DAG.getConstant(NewCC, MVT::i8),
SDValue(Op1.getNode(), 1) };
return DAG.getNode(X86ISD::CMOV, DL, VTs, Ops, array_lengthof(Ops));
}
}
// (select (x == 0), -1, y) -> (sign_bit (x - 1)) | y
// (select (x == 0), y, -1) -> ~(sign_bit (x - 1)) | y
// (select (x != 0), y, -1) -> (sign_bit (x - 1)) | y
// (select (x != 0), -1, y) -> ~(sign_bit (x - 1)) | y
if (Cond.getOpcode() == X86ISD::SETCC &&
Cond.getOperand(1).getOpcode() == X86ISD::CMP &&
isZero(Cond.getOperand(1).getOperand(1))) {
SDValue Cmp = Cond.getOperand(1);
unsigned CondCode =cast<ConstantSDNode>(Cond.getOperand(0))->getZExtValue();
if ((isAllOnes(Op1) || isAllOnes(Op2)) &&
(CondCode == X86::COND_E || CondCode == X86::COND_NE)) {
SDValue Y = isAllOnes(Op2) ? Op1 : Op2;
SDValue CmpOp0 = Cmp.getOperand(0);
Cmp = DAG.getNode(X86ISD::CMP, DL, MVT::i32,
CmpOp0, DAG.getConstant(1, CmpOp0.getValueType()));
Cmp = ConvertCmpIfNecessary(Cmp, DAG);
SDValue Res = // Res = 0 or -1.
DAG.getNode(X86ISD::SETCC_CARRY, DL, Op.getValueType(),
DAG.getConstant(X86::COND_B, MVT::i8), Cmp);
if (isAllOnes(Op1) != (CondCode == X86::COND_E))
Res = DAG.getNOT(DL, Res, Res.getValueType());
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(Op2);
if (N2C == 0 || !N2C->isNullValue())
Res = DAG.getNode(ISD::OR, DL, Res.getValueType(), Res, Y);
return Res;
}
}
// Look past (and (setcc_carry (cmp ...)), 1).
if (Cond.getOpcode() == ISD::AND &&
Cond.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY) {
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Cond.getOperand(1));
if (C && C->getAPIntValue() == 1)
Cond = Cond.getOperand(0);
}
// If condition flag is set by a X86ISD::CMP, then use it as the condition
// setting operand in place of the X86ISD::SETCC.
unsigned CondOpcode = Cond.getOpcode();
if (CondOpcode == X86ISD::SETCC ||
CondOpcode == X86ISD::SETCC_CARRY) {
CC = Cond.getOperand(0);
SDValue Cmp = Cond.getOperand(1);
unsigned Opc = Cmp.getOpcode();
EVT VT = Op.getValueType();
bool IllegalFPCMov = false;
if (VT.isFloatingPoint() && !VT.isVector() &&
!isScalarFPTypeInSSEReg(VT)) // FPStack?
IllegalFPCMov = !hasFPCMov(cast<ConstantSDNode>(CC)->getSExtValue());
if ((isX86LogicalCmp(Cmp) && !IllegalFPCMov) ||
Opc == X86ISD::BT) { // FIXME
Cond = Cmp;
addTest = false;
}
} else if (CondOpcode == ISD::USUBO || CondOpcode == ISD::SSUBO ||
CondOpcode == ISD::UADDO || CondOpcode == ISD::SADDO ||
((CondOpcode == ISD::UMULO || CondOpcode == ISD::SMULO) &&
Cond.getOperand(0).getValueType() != MVT::i8)) {
SDValue LHS = Cond.getOperand(0);
SDValue RHS = Cond.getOperand(1);
unsigned X86Opcode;
unsigned X86Cond;
SDVTList VTs;
switch (CondOpcode) {
case ISD::UADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_B; break;
case ISD::SADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_O; break;
case ISD::USUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_B; break;
case ISD::SSUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_O; break;
case ISD::UMULO: X86Opcode = X86ISD::UMUL; X86Cond = X86::COND_O; break;
case ISD::SMULO: X86Opcode = X86ISD::SMUL; X86Cond = X86::COND_O; break;
default: llvm_unreachable("unexpected overflowing operator");
}
if (CondOpcode == ISD::UMULO)
VTs = DAG.getVTList(LHS.getValueType(), LHS.getValueType(),
MVT::i32);
else
VTs = DAG.getVTList(LHS.getValueType(), MVT::i32);
SDValue X86Op = DAG.getNode(X86Opcode, DL, VTs, LHS, RHS);
if (CondOpcode == ISD::UMULO)
Cond = X86Op.getValue(2);
else
Cond = X86Op.getValue(1);
CC = DAG.getConstant(X86Cond, MVT::i8);
addTest = false;
}
if (addTest) {
// Look pass the truncate.
if (Cond.getOpcode() == ISD::TRUNCATE)
Cond = Cond.getOperand(0);
// We know the result of AND is compared against zero. Try to match
// it to BT.
if (Cond.getOpcode() == ISD::AND && Cond.hasOneUse()) {
SDValue NewSetCC = LowerToBT(Cond, ISD::SETNE, DL, DAG);
if (NewSetCC.getNode()) {
CC = NewSetCC.getOperand(0);
Cond = NewSetCC.getOperand(1);
addTest = false;
}
}
}
if (addTest) {
CC = DAG.getConstant(X86::COND_NE, MVT::i8);
Cond = EmitTest(Cond, X86::COND_NE, DAG);
}
// a < b ? -1 : 0 -> RES = ~setcc_carry
// a < b ? 0 : -1 -> RES = setcc_carry
// a >= b ? -1 : 0 -> RES = setcc_carry
// a >= b ? 0 : -1 -> RES = ~setcc_carry
if (Cond.getOpcode() == X86ISD::CMP) {
Cond = ConvertCmpIfNecessary(Cond, DAG);
unsigned CondCode = cast<ConstantSDNode>(CC)->getZExtValue();
if ((CondCode == X86::COND_AE || CondCode == X86::COND_B) &&
(isAllOnes(Op1) || isAllOnes(Op2)) && (isZero(Op1) || isZero(Op2))) {
SDValue Res = DAG.getNode(X86ISD::SETCC_CARRY, DL, Op.getValueType(),
DAG.getConstant(X86::COND_B, MVT::i8), Cond);
if (isAllOnes(Op1) != (CondCode == X86::COND_B))
return DAG.getNOT(DL, Res, Res.getValueType());
return Res;
}
}
// X86ISD::CMOV means set the result (which is operand 1) to the RHS if
// condition is true.
SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
SDValue Ops[] = { Op2, Op1, CC, Cond };
return DAG.getNode(X86ISD::CMOV, DL, VTs, Ops, array_lengthof(Ops));
}
// isAndOrOfSingleUseSetCCs - Return true if node is an ISD::AND or
// ISD::OR of two X86ISD::SETCC nodes each of which has no other use apart
// from the AND / OR.
static bool isAndOrOfSetCCs(SDValue Op, unsigned &Opc) {
Opc = Op.getOpcode();
if (Opc != ISD::OR && Opc != ISD::AND)
return false;
return (Op.getOperand(0).getOpcode() == X86ISD::SETCC &&
Op.getOperand(0).hasOneUse() &&
Op.getOperand(1).getOpcode() == X86ISD::SETCC &&
Op.getOperand(1).hasOneUse());
}
// isXor1OfSetCC - Return true if node is an ISD::XOR of a X86ISD::SETCC and
// 1 and that the SETCC node has a single use.
static bool isXor1OfSetCC(SDValue Op) {
if (Op.getOpcode() != ISD::XOR)
return false;
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(Op.getOperand(1));
if (N1C && N1C->getAPIntValue() == 1) {
return Op.getOperand(0).getOpcode() == X86ISD::SETCC &&
Op.getOperand(0).hasOneUse();
}
return false;
}
SDValue X86TargetLowering::LowerBRCOND(SDValue Op, SelectionDAG &DAG) const {
bool addTest = true;
SDValue Chain = Op.getOperand(0);
SDValue Cond = Op.getOperand(1);
SDValue Dest = Op.getOperand(2);
DebugLoc dl = Op.getDebugLoc();
SDValue CC;
bool Inverted = false;
if (Cond.getOpcode() == ISD::SETCC) {
// Check for setcc([su]{add,sub,mul}o == 0).
if (cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETEQ &&
isa<ConstantSDNode>(Cond.getOperand(1)) &&
cast<ConstantSDNode>(Cond.getOperand(1))->isNullValue() &&
Cond.getOperand(0).getResNo() == 1 &&
(Cond.getOperand(0).getOpcode() == ISD::SADDO ||
Cond.getOperand(0).getOpcode() == ISD::UADDO ||
Cond.getOperand(0).getOpcode() == ISD::SSUBO ||
Cond.getOperand(0).getOpcode() == ISD::USUBO ||
Cond.getOperand(0).getOpcode() == ISD::SMULO ||
Cond.getOperand(0).getOpcode() == ISD::UMULO)) {
Inverted = true;
Cond = Cond.getOperand(0);
} else {
SDValue NewCond = LowerSETCC(Cond, DAG);
if (NewCond.getNode())
Cond = NewCond;
}
}
#if 0
// FIXME: LowerXALUO doesn't handle these!!
else if (Cond.getOpcode() == X86ISD::ADD ||
Cond.getOpcode() == X86ISD::SUB ||
Cond.getOpcode() == X86ISD::SMUL ||
Cond.getOpcode() == X86ISD::UMUL)
Cond = LowerXALUO(Cond, DAG);
#endif
// Look pass (and (setcc_carry (cmp ...)), 1).
if (Cond.getOpcode() == ISD::AND &&
Cond.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY) {
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Cond.getOperand(1));
if (C && C->getAPIntValue() == 1)
Cond = Cond.getOperand(0);
}
// If condition flag is set by a X86ISD::CMP, then use it as the condition
// setting operand in place of the X86ISD::SETCC.
unsigned CondOpcode = Cond.getOpcode();
if (CondOpcode == X86ISD::SETCC ||
CondOpcode == X86ISD::SETCC_CARRY) {
CC = Cond.getOperand(0);
SDValue Cmp = Cond.getOperand(1);
unsigned Opc = Cmp.getOpcode();
// FIXME: WHY THE SPECIAL CASING OF LogicalCmp??
if (isX86LogicalCmp(Cmp) || Opc == X86ISD::BT) {
Cond = Cmp;
addTest = false;
} else {
switch (cast<ConstantSDNode>(CC)->getZExtValue()) {
default: break;
case X86::COND_O:
case X86::COND_B:
// These can only come from an arithmetic instruction with overflow,
// e.g. SADDO, UADDO.
Cond = Cond.getNode()->getOperand(1);
addTest = false;
break;
}
}
}
CondOpcode = Cond.getOpcode();
if (CondOpcode == ISD::UADDO || CondOpcode == ISD::SADDO ||
CondOpcode == ISD::USUBO || CondOpcode == ISD::SSUBO ||
((CondOpcode == ISD::UMULO || CondOpcode == ISD::SMULO) &&
Cond.getOperand(0).getValueType() != MVT::i8)) {
SDValue LHS = Cond.getOperand(0);
SDValue RHS = Cond.getOperand(1);
unsigned X86Opcode;
unsigned X86Cond;
SDVTList VTs;
switch (CondOpcode) {
case ISD::UADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_B; break;
case ISD::SADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_O; break;
case ISD::USUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_B; break;
case ISD::SSUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_O; break;
case ISD::UMULO: X86Opcode = X86ISD::UMUL; X86Cond = X86::COND_O; break;
case ISD::SMULO: X86Opcode = X86ISD::SMUL; X86Cond = X86::COND_O; break;
default: llvm_unreachable("unexpected overflowing operator");
}
if (Inverted)
X86Cond = X86::GetOppositeBranchCondition((X86::CondCode)X86Cond);
if (CondOpcode == ISD::UMULO)
VTs = DAG.getVTList(LHS.getValueType(), LHS.getValueType(),
MVT::i32);
else
VTs = DAG.getVTList(LHS.getValueType(), MVT::i32);
SDValue X86Op = DAG.getNode(X86Opcode, dl, VTs, LHS, RHS);
if (CondOpcode == ISD::UMULO)
Cond = X86Op.getValue(2);
else
Cond = X86Op.getValue(1);
CC = DAG.getConstant(X86Cond, MVT::i8);
addTest = false;
} else {
unsigned CondOpc;
if (Cond.hasOneUse() && isAndOrOfSetCCs(Cond, CondOpc)) {
SDValue Cmp = Cond.getOperand(0).getOperand(1);
if (CondOpc == ISD::OR) {
// Also, recognize the pattern generated by an FCMP_UNE. We can emit
// two branches instead of an explicit OR instruction with a
// separate test.
if (Cmp == Cond.getOperand(1).getOperand(1) &&
isX86LogicalCmp(Cmp)) {
CC = Cond.getOperand(0).getOperand(0);
Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
Chain, Dest, CC, Cmp);
CC = Cond.getOperand(1).getOperand(0);
Cond = Cmp;
addTest = false;
}
} else { // ISD::AND
// Also, recognize the pattern generated by an FCMP_OEQ. We can emit
// two branches instead of an explicit AND instruction with a
// separate test. However, we only do this if this block doesn't
// have a fall-through edge, because this requires an explicit
// jmp when the condition is false.
if (Cmp == Cond.getOperand(1).getOperand(1) &&
isX86LogicalCmp(Cmp) &&
Op.getNode()->hasOneUse()) {
X86::CondCode CCode =
(X86::CondCode)Cond.getOperand(0).getConstantOperandVal(0);
CCode = X86::GetOppositeBranchCondition(CCode);
CC = DAG.getConstant(CCode, MVT::i8);
SDNode *User = *Op.getNode()->use_begin();
// Look for an unconditional branch following this conditional branch.
// We need this because we need to reverse the successors in order
// to implement FCMP_OEQ.
if (User->getOpcode() == ISD::BR) {
SDValue FalseBB = User->getOperand(1);
SDNode *NewBR =
DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
assert(NewBR == User);
(void)NewBR;
Dest = FalseBB;
Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
Chain, Dest, CC, Cmp);
X86::CondCode CCode =
(X86::CondCode)Cond.getOperand(1).getConstantOperandVal(0);
CCode = X86::GetOppositeBranchCondition(CCode);
CC = DAG.getConstant(CCode, MVT::i8);
Cond = Cmp;
addTest = false;
}
}
}
} else if (Cond.hasOneUse() && isXor1OfSetCC(Cond)) {
// Recognize for xorb (setcc), 1 patterns. The xor inverts the condition.
// It should be transformed during dag combiner except when the condition
// is set by a arithmetics with overflow node.
X86::CondCode CCode =
(X86::CondCode)Cond.getOperand(0).getConstantOperandVal(0);
CCode = X86::GetOppositeBranchCondition(CCode);
CC = DAG.getConstant(CCode, MVT::i8);
Cond = Cond.getOperand(0).getOperand(1);
addTest = false;
} else if (Cond.getOpcode() == ISD::SETCC &&
cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETOEQ) {
// For FCMP_OEQ, we can emit
// two branches instead of an explicit AND instruction with a
// separate test. However, we only do this if this block doesn't
// have a fall-through edge, because this requires an explicit
// jmp when the condition is false.
if (Op.getNode()->hasOneUse()) {
SDNode *User = *Op.getNode()->use_begin();
// Look for an unconditional branch following this conditional branch.
// We need this because we need to reverse the successors in order
// to implement FCMP_OEQ.
if (User->getOpcode() == ISD::BR) {
SDValue FalseBB = User->getOperand(1);
SDNode *NewBR =
DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
assert(NewBR == User);
(void)NewBR;
Dest = FalseBB;
SDValue Cmp = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
Cond.getOperand(0), Cond.getOperand(1));
Cmp = ConvertCmpIfNecessary(Cmp, DAG);
CC = DAG.getConstant(X86::COND_NE, MVT::i8);
Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
Chain, Dest, CC, Cmp);
CC = DAG.getConstant(X86::COND_P, MVT::i8);
Cond = Cmp;
addTest = false;
}
}
} else if (Cond.getOpcode() == ISD::SETCC &&
cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETUNE) {
// For FCMP_UNE, we can emit
// two branches instead of an explicit AND instruction with a
// separate test. However, we only do this if this block doesn't
// have a fall-through edge, because this requires an explicit
// jmp when the condition is false.
if (Op.getNode()->hasOneUse()) {
SDNode *User = *Op.getNode()->use_begin();
// Look for an unconditional branch following this conditional branch.
// We need this because we need to reverse the successors in order
// to implement FCMP_UNE.
if (User->getOpcode() == ISD::BR) {
SDValue FalseBB = User->getOperand(1);
SDNode *NewBR =
DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
assert(NewBR == User);
(void)NewBR;
SDValue Cmp = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
Cond.getOperand(0), Cond.getOperand(1));
Cmp = ConvertCmpIfNecessary(Cmp, DAG);
CC = DAG.getConstant(X86::COND_NE, MVT::i8);
Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
Chain, Dest, CC, Cmp);
CC = DAG.getConstant(X86::COND_NP, MVT::i8);
Cond = Cmp;
addTest = false;
Dest = FalseBB;
}
}
}
}
if (addTest) {
// Look pass the truncate.
if (Cond.getOpcode() == ISD::TRUNCATE)
Cond = Cond.getOperand(0);
// We know the result of AND is compared against zero. Try to match
// it to BT.
if (Cond.getOpcode() == ISD::AND && Cond.hasOneUse()) {
SDValue NewSetCC = LowerToBT(Cond, ISD::SETNE, dl, DAG);
if (NewSetCC.getNode()) {
CC = NewSetCC.getOperand(0);
Cond = NewSetCC.getOperand(1);
addTest = false;
}
}
}
if (addTest) {
CC = DAG.getConstant(X86::COND_NE, MVT::i8);
Cond = EmitTest(Cond, X86::COND_NE, DAG);
}
Cond = ConvertCmpIfNecessary(Cond, DAG);
return DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
Chain, Dest, CC, Cond);
}
// Lower dynamic stack allocation to _alloca call for Cygwin/Mingw targets.
// Calls to _alloca is needed to probe the stack when allocating more than 4k
// bytes in one go. Touching the stack at 4K increments is necessary to ensure
// that the guard pages used by the OS virtual memory manager are allocated in
// correct sequence.
SDValue
X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
SelectionDAG &DAG) const {
assert((Subtarget->isTargetCygMing() || Subtarget->isTargetWindows() ||
getTargetMachine().Options.EnableSegmentedStacks) &&
"This should be used only on Windows targets or when segmented stacks "
"are being used");
assert(!Subtarget->isTargetEnvMacho() && "Not implemented");
DebugLoc dl = Op.getDebugLoc();
// Get the inputs.
SDValue Chain = Op.getOperand(0);
SDValue Size = Op.getOperand(1);
// FIXME: Ensure alignment here
bool Is64Bit = Subtarget->is64Bit();
EVT SPTy = Is64Bit ? MVT::i64 : MVT::i32;
if (getTargetMachine().Options.EnableSegmentedStacks) {
MachineFunction &MF = DAG.getMachineFunction();
MachineRegisterInfo &MRI = MF.getRegInfo();
if (Is64Bit) {
// The 64 bit implementation of segmented stacks needs to clobber both r10
// r11. This makes it impossible to use it along with nested parameters.
const Function *F = MF.getFunction();
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; I++)
if (I->hasNestAttr())
report_fatal_error("Cannot use segmented stacks with functions that "
"have nested arguments.");
}
const TargetRegisterClass *AddrRegClass =
getRegClassFor(Subtarget->is64Bit() ? MVT::i64:MVT::i32);
unsigned Vreg = MRI.createVirtualRegister(AddrRegClass);
Chain = DAG.getCopyToReg(Chain, dl, Vreg, Size);
SDValue Value = DAG.getNode(X86ISD::SEG_ALLOCA, dl, SPTy, Chain,
DAG.getRegister(Vreg, SPTy));
SDValue Ops1[2] = { Value, Chain };
return DAG.getMergeValues(Ops1, 2, dl);
} else {
SDValue Flag;
unsigned Reg = (Subtarget->is64Bit() ? X86::RAX : X86::EAX);
Chain = DAG.getCopyToReg(Chain, dl, Reg, Size, Flag);
Flag = Chain.getValue(1);
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
Chain = DAG.getNode(X86ISD::WIN_ALLOCA, dl, NodeTys, Chain, Flag);
Flag = Chain.getValue(1);
Chain = DAG.getCopyFromReg(Chain, dl, X86StackPtr, SPTy).getValue(1);
SDValue Ops1[2] = { Chain.getValue(0), Chain };
return DAG.getMergeValues(Ops1, 2, dl);
}
}
SDValue X86TargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
DebugLoc DL = Op.getDebugLoc();
if (!Subtarget->is64Bit() || Subtarget->isTargetWin64()) {
// vastart just stores the address of the VarArgsFrameIndex slot into the
// memory location argument.
SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
getPointerTy());
return DAG.getStore(Op.getOperand(0), DL, FR, Op.getOperand(1),
MachinePointerInfo(SV), false, false, 0);
}
// __va_list_tag:
// gp_offset (0 - 6 * 8)
// fp_offset (48 - 48 + 8 * 16)
// overflow_arg_area (point to parameters coming in memory).
// reg_save_area
SmallVector<SDValue, 8> MemOps;
SDValue FIN = Op.getOperand(1);
// Store gp_offset
SDValue Store = DAG.getStore(Op.getOperand(0), DL,
DAG.getConstant(FuncInfo->getVarArgsGPOffset(),
MVT::i32),
FIN, MachinePointerInfo(SV), false, false, 0);
MemOps.push_back(Store);
// Store fp_offset
FIN = DAG.getNode(ISD::ADD, DL, getPointerTy(),
FIN, DAG.getIntPtrConstant(4));
Store = DAG.getStore(Op.getOperand(0), DL,
DAG.getConstant(FuncInfo->getVarArgsFPOffset(),
MVT::i32),
FIN, MachinePointerInfo(SV, 4), false, false, 0);
MemOps.push_back(Store);
// Store ptr to overflow_arg_area
FIN = DAG.getNode(ISD::ADD, DL, getPointerTy(),
FIN, DAG.getIntPtrConstant(4));
SDValue OVFIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
getPointerTy());
Store = DAG.getStore(Op.getOperand(0), DL, OVFIN, FIN,
MachinePointerInfo(SV, 8),
false, false, 0);
MemOps.push_back(Store);
// Store ptr to reg_save_area.
FIN = DAG.getNode(ISD::ADD, DL, getPointerTy(),
FIN, DAG.getIntPtrConstant(8));
SDValue RSFIN = DAG.getFrameIndex(FuncInfo->getRegSaveFrameIndex(),
getPointerTy());
Store = DAG.getStore(Op.getOperand(0), DL, RSFIN, FIN,
MachinePointerInfo(SV, 16), false, false, 0);
MemOps.push_back(Store);
return DAG.getNode(ISD::TokenFactor, DL, MVT::Other,
&MemOps[0], MemOps.size());
}
SDValue X86TargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG) const {
assert(Subtarget->is64Bit() &&
"LowerVAARG only handles 64-bit va_arg!");
assert((Subtarget->isTargetLinux() ||
Subtarget->isTargetDarwin()) &&
"Unhandled target in LowerVAARG");
assert(Op.getNode()->getNumOperands() == 4);
SDValue Chain = Op.getOperand(0);
SDValue SrcPtr = Op.getOperand(1);
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
unsigned Align = Op.getConstantOperandVal(3);
DebugLoc dl = Op.getDebugLoc();
EVT ArgVT = Op.getNode()->getValueType(0);
Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
uint32_t ArgSize = getTargetData()->getTypeAllocSize(ArgTy);
uint8_t ArgMode;
// Decide which area this value should be read from.
// TODO: Implement the AMD64 ABI in its entirety. This simple
// selection mechanism works only for the basic types.
if (ArgVT == MVT::f80) {
llvm_unreachable("va_arg for f80 not yet implemented");
} else if (ArgVT.isFloatingPoint() && ArgSize <= 16 /*bytes*/) {
ArgMode = 2; // Argument passed in XMM register. Use fp_offset.
} else if (ArgVT.isInteger() && ArgSize <= 32 /*bytes*/) {
ArgMode = 1; // Argument passed in GPR64 register(s). Use gp_offset.
} else {
llvm_unreachable("Unhandled argument type in LowerVAARG");
}
if (ArgMode == 2) {
// Sanity Check: Make sure using fp_offset makes sense.
assert(!getTargetMachine().Options.UseSoftFloat &&
!(DAG.getMachineFunction()
.getFunction()->hasFnAttr(Attribute::NoImplicitFloat)) &&
Subtarget->hasSSE1());
}
// Insert VAARG_64 node into the DAG
// VAARG_64 returns two values: Variable Argument Address, Chain
SmallVector<SDValue, 11> InstOps;
InstOps.push_back(Chain);
InstOps.push_back(SrcPtr);
InstOps.push_back(DAG.getConstant(ArgSize, MVT::i32));
InstOps.push_back(DAG.getConstant(ArgMode, MVT::i8));
InstOps.push_back(DAG.getConstant(Align, MVT::i32));
SDVTList VTs = DAG.getVTList(getPointerTy(), MVT::Other);
SDValue VAARG = DAG.getMemIntrinsicNode(X86ISD::VAARG_64, dl,
VTs, &InstOps[0], InstOps.size(),
MVT::i64,
MachinePointerInfo(SV),
/*Align=*/0,
/*Volatile=*/false,
/*ReadMem=*/true,
/*WriteMem=*/true);
Chain = VAARG.getValue(1);
// Load the next argument and return it
return DAG.getLoad(ArgVT, dl,
Chain,
VAARG,
MachinePointerInfo(),
false, false, false, 0);
}
SDValue X86TargetLowering::LowerVACOPY(SDValue Op, SelectionDAG &DAG) const {
// X86-64 va_list is a struct { i32, i32, i8*, i8* }.
assert(Subtarget->is64Bit() && "This code only handles 64-bit va_copy!");
SDValue Chain = Op.getOperand(0);
SDValue DstPtr = Op.getOperand(1);
SDValue SrcPtr = Op.getOperand(2);
const Value *DstSV = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
const Value *SrcSV = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
DebugLoc DL = Op.getDebugLoc();
return DAG.getMemcpy(Chain, DL, DstPtr, SrcPtr,
DAG.getIntPtrConstant(24), 8, /*isVolatile*/false,
false,
MachinePointerInfo(DstSV), MachinePointerInfo(SrcSV));
}
// getTargetVShiftNOde - Handle vector element shifts where the shift amount
// may or may not be a constant. Takes immediate version of shift as input.
static SDValue getTargetVShiftNode(unsigned Opc, DebugLoc dl, EVT VT,
SDValue SrcOp, SDValue ShAmt,
SelectionDAG &DAG) {
assert(ShAmt.getValueType() == MVT::i32 && "ShAmt is not i32");
if (isa<ConstantSDNode>(ShAmt)) {
switch (Opc) {
default: llvm_unreachable("Unknown target vector shift node");
case X86ISD::VSHLI:
case X86ISD::VSRLI:
case X86ISD::VSRAI:
return DAG.getNode(Opc, dl, VT, SrcOp, ShAmt);
}
}
// Change opcode to non-immediate version
switch (Opc) {
default: llvm_unreachable("Unknown target vector shift node");
case X86ISD::VSHLI: Opc = X86ISD::VSHL; break;
case X86ISD::VSRLI: Opc = X86ISD::VSRL; break;
case X86ISD::VSRAI: Opc = X86ISD::VSRA; break;
}
// Need to build a vector containing shift amount
// Shift amount is 32-bits, but SSE instructions read 64-bit, so fill with 0
SDValue ShOps[4];
ShOps[0] = ShAmt;
ShOps[1] = DAG.getConstant(0, MVT::i32);
ShOps[2] = DAG.getUNDEF(MVT::i32);
ShOps[3] = DAG.getUNDEF(MVT::i32);
ShAmt = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, &ShOps[0], 4);
ShAmt = DAG.getNode(ISD::BITCAST, dl, VT, ShAmt);
return DAG.getNode(Opc, dl, VT, SrcOp, ShAmt);
}
SDValue
X86TargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
switch (IntNo) {
default: return SDValue(); // Don't custom lower most intrinsics.
// Comparison intrinsics.
case Intrinsic::x86_sse_comieq_ss:
case Intrinsic::x86_sse_comilt_ss:
case Intrinsic::x86_sse_comile_ss:
case Intrinsic::x86_sse_comigt_ss:
case Intrinsic::x86_sse_comige_ss:
case Intrinsic::x86_sse_comineq_ss:
case Intrinsic::x86_sse_ucomieq_ss:
case Intrinsic::x86_sse_ucomilt_ss:
case Intrinsic::x86_sse_ucomile_ss:
case Intrinsic::x86_sse_ucomigt_ss:
case Intrinsic::x86_sse_ucomige_ss:
case Intrinsic::x86_sse_ucomineq_ss:
case Intrinsic::x86_sse2_comieq_sd:
case Intrinsic::x86_sse2_comilt_sd:
case Intrinsic::x86_sse2_comile_sd:
case Intrinsic::x86_sse2_comigt_sd:
case Intrinsic::x86_sse2_comige_sd:
case Intrinsic::x86_sse2_comineq_sd:
case Intrinsic::x86_sse2_ucomieq_sd:
case Intrinsic::x86_sse2_ucomilt_sd:
case Intrinsic::x86_sse2_ucomile_sd:
case Intrinsic::x86_sse2_ucomigt_sd:
case Intrinsic::x86_sse2_ucomige_sd:
case Intrinsic::x86_sse2_ucomineq_sd: {
unsigned Opc = 0;
ISD::CondCode CC = ISD::SETCC_INVALID;
switch (IntNo) {
default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
case Intrinsic::x86_sse_comieq_ss:
case Intrinsic::x86_sse2_comieq_sd:
Opc = X86ISD::COMI;
CC = ISD::SETEQ;
break;
case Intrinsic::x86_sse_comilt_ss:
case Intrinsic::x86_sse2_comilt_sd:
Opc = X86ISD::COMI;
CC = ISD::SETLT;
break;
case Intrinsic::x86_sse_comile_ss:
case Intrinsic::x86_sse2_comile_sd:
Opc = X86ISD::COMI;
CC = ISD::SETLE;
break;
case Intrinsic::x86_sse_comigt_ss:
case Intrinsic::x86_sse2_comigt_sd:
Opc = X86ISD::COMI;
CC = ISD::SETGT;
break;
case Intrinsic::x86_sse_comige_ss:
case Intrinsic::x86_sse2_comige_sd:
Opc = X86ISD::COMI;
CC = ISD::SETGE;
break;
case Intrinsic::x86_sse_comineq_ss:
case Intrinsic::x86_sse2_comineq_sd:
Opc = X86ISD::COMI;
CC = ISD::SETNE;
break;
case Intrinsic::x86_sse_ucomieq_ss:
case Intrinsic::x86_sse2_ucomieq_sd:
Opc = X86ISD::UCOMI;
CC = ISD::SETEQ;
break;
case Intrinsic::x86_sse_ucomilt_ss:
case Intrinsic::x86_sse2_ucomilt_sd:
Opc = X86ISD::UCOMI;
CC = ISD::SETLT;
break;
case Intrinsic::x86_sse_ucomile_ss:
case Intrinsic::x86_sse2_ucomile_sd:
Opc = X86ISD::UCOMI;
CC = ISD::SETLE;
break;
case Intrinsic::x86_sse_ucomigt_ss:
case Intrinsic::x86_sse2_ucomigt_sd:
Opc = X86ISD::UCOMI;
CC = ISD::SETGT;
break;
case Intrinsic::x86_sse_ucomige_ss:
case Intrinsic::x86_sse2_ucomige_sd:
Opc = X86ISD::UCOMI;
CC = ISD::SETGE;
break;
case Intrinsic::x86_sse_ucomineq_ss:
case Intrinsic::x86_sse2_ucomineq_sd:
Opc = X86ISD::UCOMI;
CC = ISD::SETNE;
break;
}
SDValue LHS = Op.getOperand(1);
SDValue RHS = Op.getOperand(2);
unsigned X86CC = TranslateX86CC(CC, true, LHS, RHS, DAG);
assert(X86CC != X86::COND_INVALID && "Unexpected illegal condition!");
SDValue Cond = DAG.getNode(Opc, dl, MVT::i32, LHS, RHS);
SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
DAG.getConstant(X86CC, MVT::i8), Cond);
return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
}
// XOP comparison intrinsics
case Intrinsic::x86_xop_vpcomltb:
case Intrinsic::x86_xop_vpcomltw:
case Intrinsic::x86_xop_vpcomltd:
case Intrinsic::x86_xop_vpcomltq:
case Intrinsic::x86_xop_vpcomltub:
case Intrinsic::x86_xop_vpcomltuw:
case Intrinsic::x86_xop_vpcomltud:
case Intrinsic::x86_xop_vpcomltuq:
case Intrinsic::x86_xop_vpcomleb:
case Intrinsic::x86_xop_vpcomlew:
case Intrinsic::x86_xop_vpcomled:
case Intrinsic::x86_xop_vpcomleq:
case Intrinsic::x86_xop_vpcomleub:
case Intrinsic::x86_xop_vpcomleuw:
case Intrinsic::x86_xop_vpcomleud:
case Intrinsic::x86_xop_vpcomleuq:
case Intrinsic::x86_xop_vpcomgtb:
case Intrinsic::x86_xop_vpcomgtw:
case Intrinsic::x86_xop_vpcomgtd:
case Intrinsic::x86_xop_vpcomgtq:
case Intrinsic::x86_xop_vpcomgtub:
case Intrinsic::x86_xop_vpcomgtuw:
case Intrinsic::x86_xop_vpcomgtud:
case Intrinsic::x86_xop_vpcomgtuq:
case Intrinsic::x86_xop_vpcomgeb:
case Intrinsic::x86_xop_vpcomgew:
case Intrinsic::x86_xop_vpcomged:
case Intrinsic::x86_xop_vpcomgeq:
case Intrinsic::x86_xop_vpcomgeub:
case Intrinsic::x86_xop_vpcomgeuw:
case Intrinsic::x86_xop_vpcomgeud:
case Intrinsic::x86_xop_vpcomgeuq:
case Intrinsic::x86_xop_vpcomeqb:
case Intrinsic::x86_xop_vpcomeqw:
case Intrinsic::x86_xop_vpcomeqd:
case Intrinsic::x86_xop_vpcomeqq:
case Intrinsic::x86_xop_vpcomequb:
case Intrinsic::x86_xop_vpcomequw:
case Intrinsic::x86_xop_vpcomequd:
case Intrinsic::x86_xop_vpcomequq:
case Intrinsic::x86_xop_vpcomneb:
case Intrinsic::x86_xop_vpcomnew:
case Intrinsic::x86_xop_vpcomned:
case Intrinsic::x86_xop_vpcomneq:
case Intrinsic::x86_xop_vpcomneub:
case Intrinsic::x86_xop_vpcomneuw:
case Intrinsic::x86_xop_vpcomneud:
case Intrinsic::x86_xop_vpcomneuq:
case Intrinsic::x86_xop_vpcomfalseb:
case Intrinsic::x86_xop_vpcomfalsew:
case Intrinsic::x86_xop_vpcomfalsed:
case Intrinsic::x86_xop_vpcomfalseq:
case Intrinsic::x86_xop_vpcomfalseub:
case Intrinsic::x86_xop_vpcomfalseuw:
case Intrinsic::x86_xop_vpcomfalseud:
case Intrinsic::x86_xop_vpcomfalseuq:
case Intrinsic::x86_xop_vpcomtrueb:
case Intrinsic::x86_xop_vpcomtruew:
case Intrinsic::x86_xop_vpcomtrued:
case Intrinsic::x86_xop_vpcomtrueq:
case Intrinsic::x86_xop_vpcomtrueub:
case Intrinsic::x86_xop_vpcomtrueuw:
case Intrinsic::x86_xop_vpcomtrueud:
case Intrinsic::x86_xop_vpcomtrueuq: {
unsigned CC = 0;
unsigned Opc = 0;
switch (IntNo) {
default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
case Intrinsic::x86_xop_vpcomltb:
case Intrinsic::x86_xop_vpcomltw:
case Intrinsic::x86_xop_vpcomltd:
case Intrinsic::x86_xop_vpcomltq:
CC = 0;
Opc = X86ISD::VPCOM;
break;
case Intrinsic::x86_xop_vpcomltub:
case Intrinsic::x86_xop_vpcomltuw:
case Intrinsic::x86_xop_vpcomltud:
case Intrinsic::x86_xop_vpcomltuq:
CC = 0;
Opc = X86ISD::VPCOMU;
break;
case Intrinsic::x86_xop_vpcomleb:
case Intrinsic::x86_xop_vpcomlew:
case Intrinsic::x86_xop_vpcomled:
case Intrinsic::x86_xop_vpcomleq:
CC = 1;
Opc = X86ISD::VPCOM;
break;
case Intrinsic::x86_xop_vpcomleub:
case Intrinsic::x86_xop_vpcomleuw:
case Intrinsic::x86_xop_vpcomleud:
case Intrinsic::x86_xop_vpcomleuq:
CC = 1;
Opc = X86ISD::VPCOMU;
break;
case Intrinsic::x86_xop_vpcomgtb:
case Intrinsic::x86_xop_vpcomgtw:
case Intrinsic::x86_xop_vpcomgtd:
case Intrinsic::x86_xop_vpcomgtq:
CC = 2;
Opc = X86ISD::VPCOM;
break;
case Intrinsic::x86_xop_vpcomgtub:
case Intrinsic::x86_xop_vpcomgtuw:
case Intrinsic::x86_xop_vpcomgtud:
case Intrinsic::x86_xop_vpcomgtuq:
CC = 2;
Opc = X86ISD::VPCOMU;
break;
case Intrinsic::x86_xop_vpcomgeb:
case Intrinsic::x86_xop_vpcomgew:
case Intrinsic::x86_xop_vpcomged:
case Intrinsic::x86_xop_vpcomgeq:
CC = 3;
Opc = X86ISD::VPCOM;
break;
case Intrinsic::x86_xop_vpcomgeub:
case Intrinsic::x86_xop_vpcomgeuw:
case Intrinsic::x86_xop_vpcomgeud:
case Intrinsic::x86_xop_vpcomgeuq:
CC = 3;
Opc = X86ISD::VPCOMU;
break;
case Intrinsic::x86_xop_vpcomeqb:
case Intrinsic::x86_xop_vpcomeqw:
case Intrinsic::x86_xop_vpcomeqd:
case Intrinsic::x86_xop_vpcomeqq:
CC = 4;
Opc = X86ISD::VPCOM;
break;
case Intrinsic::x86_xop_vpcomequb:
case Intrinsic::x86_xop_vpcomequw:
case Intrinsic::x86_xop_vpcomequd:
case Intrinsic::x86_xop_vpcomequq:
CC = 4;
Opc = X86ISD::VPCOMU;
break;
case Intrinsic::x86_xop_vpcomneb:
case Intrinsic::x86_xop_vpcomnew:
case Intrinsic::x86_xop_vpcomned:
case Intrinsic::x86_xop_vpcomneq:
CC = 5;
Opc = X86ISD::VPCOM;
break;
case Intrinsic::x86_xop_vpcomneub:
case Intrinsic::x86_xop_vpcomneuw:
case Intrinsic::x86_xop_vpcomneud:
case Intrinsic::x86_xop_vpcomneuq:
CC = 5;
Opc = X86ISD::VPCOMU;
break;
case Intrinsic::x86_xop_vpcomfalseb:
case Intrinsic::x86_xop_vpcomfalsew:
case Intrinsic::x86_xop_vpcomfalsed:
case Intrinsic::x86_xop_vpcomfalseq:
CC = 6;
Opc = X86ISD::VPCOM;
break;
case Intrinsic::x86_xop_vpcomfalseub:
case Intrinsic::x86_xop_vpcomfalseuw:
case Intrinsic::x86_xop_vpcomfalseud:
case Intrinsic::x86_xop_vpcomfalseuq:
CC = 6;
Opc = X86ISD::VPCOMU;
break;
case Intrinsic::x86_xop_vpcomtrueb:
case Intrinsic::x86_xop_vpcomtruew:
case Intrinsic::x86_xop_vpcomtrued:
case Intrinsic::x86_xop_vpcomtrueq:
CC = 7;
Opc = X86ISD::VPCOM;
break;
case Intrinsic::x86_xop_vpcomtrueub:
case Intrinsic::x86_xop_vpcomtrueuw:
case Intrinsic::x86_xop_vpcomtrueud:
case Intrinsic::x86_xop_vpcomtrueuq:
CC = 7;
Opc = X86ISD::VPCOMU;
break;
}
SDValue LHS = Op.getOperand(1);
SDValue RHS = Op.getOperand(2);
return DAG.getNode(Opc, dl, Op.getValueType(), LHS, RHS,
DAG.getConstant(CC, MVT::i8));
}
// Arithmetic intrinsics.
case Intrinsic::x86_sse2_pmulu_dq:
case Intrinsic::x86_avx2_pmulu_dq:
return DAG.getNode(X86ISD::PMULUDQ, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_sse3_hadd_ps:
case Intrinsic::x86_sse3_hadd_pd:
case Intrinsic::x86_avx_hadd_ps_256:
case Intrinsic::x86_avx_hadd_pd_256:
return DAG.getNode(X86ISD::FHADD, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_sse3_hsub_ps:
case Intrinsic::x86_sse3_hsub_pd:
case Intrinsic::x86_avx_hsub_ps_256:
case Intrinsic::x86_avx_hsub_pd_256:
return DAG.getNode(X86ISD::FHSUB, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_ssse3_phadd_w_128:
case Intrinsic::x86_ssse3_phadd_d_128:
case Intrinsic::x86_avx2_phadd_w:
case Intrinsic::x86_avx2_phadd_d:
return DAG.getNode(X86ISD::HADD, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_ssse3_phsub_w_128:
case Intrinsic::x86_ssse3_phsub_d_128:
case Intrinsic::x86_avx2_phsub_w:
case Intrinsic::x86_avx2_phsub_d:
return DAG.getNode(X86ISD::HSUB, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_avx2_psllv_d:
case Intrinsic::x86_avx2_psllv_q:
case Intrinsic::x86_avx2_psllv_d_256:
case Intrinsic::x86_avx2_psllv_q_256:
return DAG.getNode(ISD::SHL, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_avx2_psrlv_d:
case Intrinsic::x86_avx2_psrlv_q:
case Intrinsic::x86_avx2_psrlv_d_256:
case Intrinsic::x86_avx2_psrlv_q_256:
return DAG.getNode(ISD::SRL, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_avx2_psrav_d:
case Intrinsic::x86_avx2_psrav_d_256:
return DAG.getNode(ISD::SRA, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_ssse3_pshuf_b_128:
case Intrinsic::x86_avx2_pshuf_b:
return DAG.getNode(X86ISD::PSHUFB, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_ssse3_psign_b_128:
case Intrinsic::x86_ssse3_psign_w_128:
case Intrinsic::x86_ssse3_psign_d_128:
case Intrinsic::x86_avx2_psign_b:
case Intrinsic::x86_avx2_psign_w:
case Intrinsic::x86_avx2_psign_d:
return DAG.getNode(X86ISD::PSIGN, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_sse41_insertps:
return DAG.getNode(X86ISD::INSERTPS, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));
case Intrinsic::x86_avx_vperm2f128_ps_256:
case Intrinsic::x86_avx_vperm2f128_pd_256:
case Intrinsic::x86_avx_vperm2f128_si_256:
case Intrinsic::x86_avx2_vperm2i128:
return DAG.getNode(X86ISD::VPERM2X128, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));
case Intrinsic::x86_avx2_permd:
case Intrinsic::x86_avx2_permps:
// Operands intentionally swapped. Mask is last operand to intrinsic,
// but second operand for node/intruction.
return DAG.getNode(X86ISD::VPERMV, dl, Op.getValueType(),
Op.getOperand(2), Op.getOperand(1));
// ptest and testp intrinsics. The intrinsic these come from are designed to
// return an integer value, not just an instruction so lower it to the ptest
// or testp pattern and a setcc for the result.
case Intrinsic::x86_sse41_ptestz:
case Intrinsic::x86_sse41_ptestc:
case Intrinsic::x86_sse41_ptestnzc:
case Intrinsic::x86_avx_ptestz_256:
case Intrinsic::x86_avx_ptestc_256:
case Intrinsic::x86_avx_ptestnzc_256:
case Intrinsic::x86_avx_vtestz_ps:
case Intrinsic::x86_avx_vtestc_ps:
case Intrinsic::x86_avx_vtestnzc_ps:
case Intrinsic::x86_avx_vtestz_pd:
case Intrinsic::x86_avx_vtestc_pd:
case Intrinsic::x86_avx_vtestnzc_pd:
case Intrinsic::x86_avx_vtestz_ps_256:
case Intrinsic::x86_avx_vtestc_ps_256:
case Intrinsic::x86_avx_vtestnzc_ps_256:
case Intrinsic::x86_avx_vtestz_pd_256:
case Intrinsic::x86_avx_vtestc_pd_256:
case Intrinsic::x86_avx_vtestnzc_pd_256: {
bool IsTestPacked = false;
unsigned X86CC = 0;
switch (IntNo) {
default: llvm_unreachable("Bad fallthrough in Intrinsic lowering.");
case Intrinsic::x86_avx_vtestz_ps:
case Intrinsic::x86_avx_vtestz_pd:
case Intrinsic::x86_avx_vtestz_ps_256:
case Intrinsic::x86_avx_vtestz_pd_256:
IsTestPacked = true; // Fallthrough
case Intrinsic::x86_sse41_ptestz:
case Intrinsic::x86_avx_ptestz_256:
// ZF = 1
X86CC = X86::COND_E;
break;
case Intrinsic::x86_avx_vtestc_ps:
case Intrinsic::x86_avx_vtestc_pd:
case Intrinsic::x86_avx_vtestc_ps_256:
case Intrinsic::x86_avx_vtestc_pd_256:
IsTestPacked = true; // Fallthrough
case Intrinsic::x86_sse41_ptestc:
case Intrinsic::x86_avx_ptestc_256:
// CF = 1
X86CC = X86::COND_B;
break;
case Intrinsic::x86_avx_vtestnzc_ps:
case Intrinsic::x86_avx_vtestnzc_pd:
case Intrinsic::x86_avx_vtestnzc_ps_256:
case Intrinsic::x86_avx_vtestnzc_pd_256:
IsTestPacked = true; // Fallthrough
case Intrinsic::x86_sse41_ptestnzc:
case Intrinsic::x86_avx_ptestnzc_256:
// ZF and CF = 0
X86CC = X86::COND_A;
break;
}
SDValue LHS = Op.getOperand(1);
SDValue RHS = Op.getOperand(2);
unsigned TestOpc = IsTestPacked ? X86ISD::TESTP : X86ISD::PTEST;
SDValue Test = DAG.getNode(TestOpc, dl, MVT::i32, LHS, RHS);
SDValue CC = DAG.getConstant(X86CC, MVT::i8);
SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8, CC, Test);
return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
}
// SSE/AVX shift intrinsics
case Intrinsic::x86_sse2_psll_w:
case Intrinsic::x86_sse2_psll_d:
case Intrinsic::x86_sse2_psll_q:
case Intrinsic::x86_avx2_psll_w:
case Intrinsic::x86_avx2_psll_d:
case Intrinsic::x86_avx2_psll_q:
return DAG.getNode(X86ISD::VSHL, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_sse2_psrl_w:
case Intrinsic::x86_sse2_psrl_d:
case Intrinsic::x86_sse2_psrl_q:
case Intrinsic::x86_avx2_psrl_w:
case Intrinsic::x86_avx2_psrl_d:
case Intrinsic::x86_avx2_psrl_q:
return DAG.getNode(X86ISD::VSRL, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_sse2_psra_w:
case Intrinsic::x86_sse2_psra_d:
case Intrinsic::x86_avx2_psra_w:
case Intrinsic::x86_avx2_psra_d:
return DAG.getNode(X86ISD::VSRA, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2));
case Intrinsic::x86_sse2_pslli_w:
case Intrinsic::x86_sse2_pslli_d:
case Intrinsic::x86_sse2_pslli_q:
case Intrinsic::x86_avx2_pslli_w:
case Intrinsic::x86_avx2_pslli_d:
case Intrinsic::x86_avx2_pslli_q:
return getTargetVShiftNode(X86ISD::VSHLI, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2), DAG);
case Intrinsic::x86_sse2_psrli_w:
case Intrinsic::x86_sse2_psrli_d:
case Intrinsic::x86_sse2_psrli_q:
case Intrinsic::x86_avx2_psrli_w:
case Intrinsic::x86_avx2_psrli_d:
case Intrinsic::x86_avx2_psrli_q:
return getTargetVShiftNode(X86ISD::VSRLI, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2), DAG);
case Intrinsic::x86_sse2_psrai_w:
case Intrinsic::x86_sse2_psrai_d:
case Intrinsic::x86_avx2_psrai_w:
case Intrinsic::x86_avx2_psrai_d:
return getTargetVShiftNode(X86ISD::VSRAI, dl, Op.getValueType(),
Op.getOperand(1), Op.getOperand(2), DAG);
// Fix vector shift instructions where the last operand is a non-immediate
// i32 value.
case Intrinsic::x86_mmx_pslli_w:
case Intrinsic::x86_mmx_pslli_d:
case Intrinsic::x86_mmx_pslli_q:
case Intrinsic::x86_mmx_psrli_w:
case Intrinsic::x86_mmx_psrli_d:
case Intrinsic::x86_mmx_psrli_q:
case Intrinsic::x86_mmx_psrai_w:
case Intrinsic::x86_mmx_psrai_d: {
SDValue ShAmt = Op.getOperand(2);
if (isa<ConstantSDNode>(ShAmt))
return SDValue();
unsigned NewIntNo = 0;
switch (IntNo) {
case Intrinsic::x86_mmx_pslli_w:
NewIntNo = Intrinsic::x86_mmx_psll_w;
break;
case Intrinsic::x86_mmx_pslli_d:
NewIntNo = Intrinsic::x86_mmx_psll_d;
break;
case Intrinsic::x86_mmx_pslli_q:
NewIntNo = Intrinsic::x86_mmx_psll_q;
break;
case Intrinsic::x86_mmx_psrli_w:
NewIntNo = Intrinsic::x86_mmx_psrl_w;
break;
case Intrinsic::x86_mmx_psrli_d:
NewIntNo = Intrinsic::x86_mmx_psrl_d;
break;
case Intrinsic::x86_mmx_psrli_q:
NewIntNo = Intrinsic::x86_mmx_psrl_q;
break;
case Intrinsic::x86_mmx_psrai_w:
NewIntNo = Intrinsic::x86_mmx_psra_w;
break;
case Intrinsic::x86_mmx_psrai_d:
NewIntNo = Intrinsic::x86_mmx_psra_d;
break;
default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
}
// The vector shift intrinsics with scalars uses 32b shift amounts but
// the sse2/mmx shift instructions reads 64 bits. Set the upper 32 bits
// to be zero.
ShAmt = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v2i32, ShAmt,
DAG.getConstant(0, MVT::i32));
// FIXME this must be lowered to get rid of the invalid type.
EVT VT = Op.getValueType();
ShAmt = DAG.getNode(ISD::BITCAST, dl, VT, ShAmt);
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
DAG.getConstant(NewIntNo, MVT::i32),
Op.getOperand(1), ShAmt);
}
}
}
SDValue X86TargetLowering::LowerRETURNADDR(SDValue Op,
SelectionDAG &DAG) const {
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
MFI->setReturnAddressIsTaken(true);
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
DebugLoc dl = Op.getDebugLoc();
if (Depth > 0) {
SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
SDValue Offset =
DAG.getConstant(TD->getPointerSize(),
Subtarget->is64Bit() ? MVT::i64 : MVT::i32);
return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
DAG.getNode(ISD::ADD, dl, getPointerTy(),
FrameAddr, Offset),
MachinePointerInfo(), false, false, false, 0);
}
// Just load the return address.
SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
RetAddrFI, MachinePointerInfo(), false, false, false, 0);
}
SDValue X86TargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
MFI->setFrameAddressIsTaken(true);
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
unsigned FrameReg = Subtarget->is64Bit() ? X86::RBP : X86::EBP;
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
while (Depth--)
FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
MachinePointerInfo(),
false, false, false, 0);
return FrameAddr;
}
SDValue X86TargetLowering::LowerFRAME_TO_ARGS_OFFSET(SDValue Op,
SelectionDAG &DAG) const {
return DAG.getIntPtrConstant(2*TD->getPointerSize());
}
SDValue X86TargetLowering::LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
SDValue Chain = Op.getOperand(0);
SDValue Offset = Op.getOperand(1);
SDValue Handler = Op.getOperand(2);
DebugLoc dl = Op.getDebugLoc();
SDValue Frame = DAG.getCopyFromReg(DAG.getEntryNode(), dl,
Subtarget->is64Bit() ? X86::RBP : X86::EBP,
getPointerTy());
unsigned StoreAddrReg = (Subtarget->is64Bit() ? X86::RCX : X86::ECX);
SDValue StoreAddr = DAG.getNode(ISD::ADD, dl, getPointerTy(), Frame,
DAG.getIntPtrConstant(TD->getPointerSize()));
StoreAddr = DAG.getNode(ISD::ADD, dl, getPointerTy(), StoreAddr, Offset);
Chain = DAG.getStore(Chain, dl, Handler, StoreAddr, MachinePointerInfo(),
false, false, 0);
Chain = DAG.getCopyToReg(Chain, dl, StoreAddrReg, StoreAddr);
MF.getRegInfo().addLiveOut(StoreAddrReg);
return DAG.getNode(X86ISD::EH_RETURN, dl,
MVT::Other,
Chain, DAG.getRegister(StoreAddrReg, getPointerTy()));
}
SDValue X86TargetLowering::LowerADJUST_TRAMPOLINE(SDValue Op,
SelectionDAG &DAG) const {
return Op.getOperand(0);
}
SDValue X86TargetLowering::LowerINIT_TRAMPOLINE(SDValue Op,
SelectionDAG &DAG) const {
SDValue Root = Op.getOperand(0);
SDValue Trmp = Op.getOperand(1); // trampoline
SDValue FPtr = Op.getOperand(2); // nested function
SDValue Nest = Op.getOperand(3); // 'nest' parameter value
DebugLoc dl = Op.getDebugLoc();
const Value *TrmpAddr = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
if (Subtarget->is64Bit()) {
SDValue OutChains[6];
// Large code-model.
const unsigned char JMP64r = 0xFF; // 64-bit jmp through register opcode.
const unsigned char MOV64ri = 0xB8; // X86::MOV64ri opcode.
const unsigned char N86R10 = X86_MC::getX86RegNum(X86::R10);
const unsigned char N86R11 = X86_MC::getX86RegNum(X86::R11);
const unsigned char REX_WB = 0x40 | 0x08 | 0x01; // REX prefix
// Load the pointer to the nested function into R11.
unsigned OpCode = ((MOV64ri | N86R11) << 8) | REX_WB; // movabsq r11
SDValue Addr = Trmp;
OutChains[0] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, MVT::i16),
Addr, MachinePointerInfo(TrmpAddr),
false, false, 0);
Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
DAG.getConstant(2, MVT::i64));
OutChains[1] = DAG.getStore(Root, dl, FPtr, Addr,
MachinePointerInfo(TrmpAddr, 2),
false, false, 2);
// Load the 'nest' parameter value into R10.
// R10 is specified in X86CallingConv.td
OpCode = ((MOV64ri | N86R10) << 8) | REX_WB; // movabsq r10
Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
DAG.getConstant(10, MVT::i64));
OutChains[2] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, MVT::i16),
Addr, MachinePointerInfo(TrmpAddr, 10),
false, false, 0);
Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
DAG.getConstant(12, MVT::i64));
OutChains[3] = DAG.getStore(Root, dl, Nest, Addr,
MachinePointerInfo(TrmpAddr, 12),
false, false, 2);
// Jump to the nested function.
OpCode = (JMP64r << 8) | REX_WB; // jmpq *...
Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
DAG.getConstant(20, MVT::i64));
OutChains[4] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, MVT::i16),
Addr, MachinePointerInfo(TrmpAddr, 20),
false, false, 0);
unsigned char ModRM = N86R11 | (4 << 3) | (3 << 6); // ...r11
Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
DAG.getConstant(22, MVT::i64));
OutChains[5] = DAG.getStore(Root, dl, DAG.getConstant(ModRM, MVT::i8), Addr,
MachinePointerInfo(TrmpAddr, 22),
false, false, 0);
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains, 6);
} else {
const Function *Func =
cast<Function>(cast<SrcValueSDNode>(Op.getOperand(5))->getValue());
CallingConv::ID CC = Func->getCallingConv();
unsigned NestReg;
switch (CC) {
default:
llvm_unreachable("Unsupported calling convention");
case CallingConv::C:
case CallingConv::X86_StdCall: {
// Pass 'nest' parameter in ECX.
// Must be kept in sync with X86CallingConv.td
NestReg = X86::ECX;
// Check that ECX wasn't needed by an 'inreg' parameter.
FunctionType *FTy = Func->getFunctionType();
const AttrListPtr &Attrs = Func->getAttributes();
if (!Attrs.isEmpty() && !Func->isVarArg()) {
unsigned InRegCount = 0;
unsigned Idx = 1;
for (FunctionType::param_iterator I = FTy->param_begin(),
E = FTy->param_end(); I != E; ++I, ++Idx)
if (Attrs.paramHasAttr(Idx, Attribute::InReg))
// FIXME: should only count parameters that are lowered to integers.
InRegCount += (TD->getTypeSizeInBits(*I) + 31) / 32;
if (InRegCount > 2) {
report_fatal_error("Nest register in use - reduce number of inreg"
" parameters!");
}
}
break;
}
case CallingConv::X86_FastCall:
case CallingConv::X86_ThisCall:
case CallingConv::Fast:
// Pass 'nest' parameter in EAX.
// Must be kept in sync with X86CallingConv.td
NestReg = X86::EAX;
break;
}
SDValue OutChains[4];
SDValue Addr, Disp;
Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
DAG.getConstant(10, MVT::i32));
Disp = DAG.getNode(ISD::SUB, dl, MVT::i32, FPtr, Addr);
// This is storing the opcode for MOV32ri.
const unsigned char MOV32ri = 0xB8; // X86::MOV32ri's opcode byte.
const unsigned char N86Reg = X86_MC::getX86RegNum(NestReg);
OutChains[0] = DAG.getStore(Root, dl,
DAG.getConstant(MOV32ri|N86Reg, MVT::i8),
Trmp, MachinePointerInfo(TrmpAddr),
false, false, 0);
Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
DAG.getConstant(1, MVT::i32));
OutChains[1] = DAG.getStore(Root, dl, Nest, Addr,
MachinePointerInfo(TrmpAddr, 1),
false, false, 1);
const unsigned char JMP = 0xE9; // jmp <32bit dst> opcode.
Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
DAG.getConstant(5, MVT::i32));
OutChains[2] = DAG.getStore(Root, dl, DAG.getConstant(JMP, MVT::i8), Addr,
MachinePointerInfo(TrmpAddr, 5),
false, false, 1);
Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
DAG.getConstant(6, MVT::i32));
OutChains[3] = DAG.getStore(Root, dl, Disp, Addr,
MachinePointerInfo(TrmpAddr, 6),
false, false, 1);
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains, 4);
}
}
SDValue X86TargetLowering::LowerFLT_ROUNDS_(SDValue Op,
SelectionDAG &DAG) const {
/*
The rounding mode is in bits 11:10 of FPSR, and has the following
settings:
00 Round to nearest
01 Round to -inf
10 Round to +inf
11 Round to 0
FLT_ROUNDS, on the other hand, expects the following:
-1 Undefined
0 Round to 0
1 Round to nearest
2 Round to +inf
3 Round to -inf
To perform the conversion, we do:
(((((FPSR & 0x800) >> 11) | ((FPSR & 0x400) >> 9)) + 1) & 3)
*/
MachineFunction &MF = DAG.getMachineFunction();
const TargetMachine &TM = MF.getTarget();
const TargetFrameLowering &TFI = *TM.getFrameLowering();
unsigned StackAlignment = TFI.getStackAlignment();
EVT VT = Op.getValueType();
DebugLoc DL = Op.getDebugLoc();
// Save FP Control Word to stack slot
int SSFI = MF.getFrameInfo()->CreateStackObject(2, StackAlignment, false);
SDValue StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
MachineMemOperand *MMO =
MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOStore, 2, 2);
SDValue Ops[] = { DAG.getEntryNode(), StackSlot };
SDValue Chain = DAG.getMemIntrinsicNode(X86ISD::FNSTCW16m, DL,
DAG.getVTList(MVT::Other),
Ops, 2, MVT::i16, MMO);
// Load FP Control Word from stack slot
SDValue CWD = DAG.getLoad(MVT::i16, DL, Chain, StackSlot,
MachinePointerInfo(), false, false, false, 0);
// Transform as necessary
SDValue CWD1 =
DAG.getNode(ISD::SRL, DL, MVT::i16,
DAG.getNode(ISD::AND, DL, MVT::i16,
CWD, DAG.getConstant(0x800, MVT::i16)),
DAG.getConstant(11, MVT::i8));
SDValue CWD2 =
DAG.getNode(ISD::SRL, DL, MVT::i16,
DAG.getNode(ISD::AND, DL, MVT::i16,
CWD, DAG.getConstant(0x400, MVT::i16)),
DAG.getConstant(9, MVT::i8));
SDValue RetVal =
DAG.getNode(ISD::AND, DL, MVT::i16,
DAG.getNode(ISD::ADD, DL, MVT::i16,
DAG.getNode(ISD::OR, DL, MVT::i16, CWD1, CWD2),
DAG.getConstant(1, MVT::i16)),
DAG.getConstant(3, MVT::i16));
return DAG.getNode((VT.getSizeInBits() < 16 ?
ISD::TRUNCATE : ISD::ZERO_EXTEND), DL, VT, RetVal);
}
SDValue X86TargetLowering::LowerCTLZ(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
EVT OpVT = VT;
unsigned NumBits = VT.getSizeInBits();
DebugLoc dl = Op.getDebugLoc();
Op = Op.getOperand(0);
if (VT == MVT::i8) {
// Zero extend to i32 since there is not an i8 bsr.
OpVT = MVT::i32;
Op = DAG.getNode(ISD::ZERO_EXTEND, dl, OpVT, Op);
}
// Issue a bsr (scan bits in reverse) which also sets EFLAGS.
SDVTList VTs = DAG.getVTList(OpVT, MVT::i32);
Op = DAG.getNode(X86ISD::BSR, dl, VTs, Op);
// If src is zero (i.e. bsr sets ZF), returns NumBits.
SDValue Ops[] = {
Op,
DAG.getConstant(NumBits+NumBits-1, OpVT),
DAG.getConstant(X86::COND_E, MVT::i8),
Op.getValue(1)
};
Op = DAG.getNode(X86ISD::CMOV, dl, OpVT, Ops, array_lengthof(Ops));
// Finally xor with NumBits-1.
Op = DAG.getNode(ISD::XOR, dl, OpVT, Op, DAG.getConstant(NumBits-1, OpVT));
if (VT == MVT::i8)
Op = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op);
return Op;
}
SDValue X86TargetLowering::LowerCTLZ_ZERO_UNDEF(SDValue Op,
SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
EVT OpVT = VT;
unsigned NumBits = VT.getSizeInBits();
DebugLoc dl = Op.getDebugLoc();
Op = Op.getOperand(0);
if (VT == MVT::i8) {
// Zero extend to i32 since there is not an i8 bsr.
OpVT = MVT::i32;
Op = DAG.getNode(ISD::ZERO_EXTEND, dl, OpVT, Op);
}
// Issue a bsr (scan bits in reverse).
SDVTList VTs = DAG.getVTList(OpVT, MVT::i32);
Op = DAG.getNode(X86ISD::BSR, dl, VTs, Op);
// And xor with NumBits-1.
Op = DAG.getNode(ISD::XOR, dl, OpVT, Op, DAG.getConstant(NumBits-1, OpVT));
if (VT == MVT::i8)
Op = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op);
return Op;
}
SDValue X86TargetLowering::LowerCTTZ(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
unsigned NumBits = VT.getSizeInBits();
DebugLoc dl = Op.getDebugLoc();
Op = Op.getOperand(0);
// Issue a bsf (scan bits forward) which also sets EFLAGS.
SDVTList VTs = DAG.getVTList(VT, MVT::i32);
Op = DAG.getNode(X86ISD::BSF, dl, VTs, Op);
// If src is zero (i.e. bsf sets ZF), returns NumBits.
SDValue Ops[] = {
Op,
DAG.getConstant(NumBits, VT),
DAG.getConstant(X86::COND_E, MVT::i8),
Op.getValue(1)
};
return DAG.getNode(X86ISD::CMOV, dl, VT, Ops, array_lengthof(Ops));
}
// Lower256IntArith - Break a 256-bit integer operation into two new 128-bit
// ones, and then concatenate the result back.
static SDValue Lower256IntArith(SDValue Op, SelectionDAG &DAG) {
EVT VT = Op.getValueType();
assert(VT.getSizeInBits() == 256 && VT.isInteger() &&
"Unsupported value type for operation");
unsigned NumElems = VT.getVectorNumElements();
DebugLoc dl = Op.getDebugLoc();
// Extract the LHS vectors
SDValue LHS = Op.getOperand(0);
SDValue LHS1 = Extract128BitVector(LHS, 0, DAG, dl);
SDValue LHS2 = Extract128BitVector(LHS, NumElems/2, DAG, dl);
// Extract the RHS vectors
SDValue RHS = Op.getOperand(1);
SDValue RHS1 = Extract128BitVector(RHS, 0, DAG, dl);
SDValue RHS2 = Extract128BitVector(RHS, NumElems/2, DAG, dl);
MVT EltVT = VT.getVectorElementType().getSimpleVT();
EVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
DAG.getNode(Op.getOpcode(), dl, NewVT, LHS1, RHS1),
DAG.getNode(Op.getOpcode(), dl, NewVT, LHS2, RHS2));
}
SDValue X86TargetLowering::LowerADD(SDValue Op, SelectionDAG &DAG) const {
assert(Op.getValueType().getSizeInBits() == 256 &&
Op.getValueType().isInteger() &&
"Only handle AVX 256-bit vector integer operation");
return Lower256IntArith(Op, DAG);
}
SDValue X86TargetLowering::LowerSUB(SDValue Op, SelectionDAG &DAG) const {
assert(Op.getValueType().getSizeInBits() == 256 &&
Op.getValueType().isInteger() &&
"Only handle AVX 256-bit vector integer operation");
return Lower256IntArith(Op, DAG);
}
SDValue X86TargetLowering::LowerMUL(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
// Decompose 256-bit ops into smaller 128-bit ops.
if (VT.getSizeInBits() == 256 && !Subtarget->hasAVX2())
return Lower256IntArith(Op, DAG);
assert((VT == MVT::v2i64 || VT == MVT::v4i64) &&
"Only know how to lower V2I64/V4I64 multiply");
DebugLoc dl = Op.getDebugLoc();
// Ahi = psrlqi(a, 32);
// Bhi = psrlqi(b, 32);
//
// AloBlo = pmuludq(a, b);
// AloBhi = pmuludq(a, Bhi);
// AhiBlo = pmuludq(Ahi, b);
// AloBhi = psllqi(AloBhi, 32);
// AhiBlo = psllqi(AhiBlo, 32);
// return AloBlo + AloBhi + AhiBlo;
SDValue A = Op.getOperand(0);
SDValue B = Op.getOperand(1);
SDValue ShAmt = DAG.getConstant(32, MVT::i32);
SDValue Ahi = DAG.getNode(X86ISD::VSRLI, dl, VT, A, ShAmt);
SDValue Bhi = DAG.getNode(X86ISD::VSRLI, dl, VT, B, ShAmt);
// Bit cast to 32-bit vectors for MULUDQ
EVT MulVT = (VT == MVT::v2i64) ? MVT::v4i32 : MVT::v8i32;
A = DAG.getNode(ISD::BITCAST, dl, MulVT, A);
B = DAG.getNode(ISD::BITCAST, dl, MulVT, B);
Ahi = DAG.getNode(ISD::BITCAST, dl, MulVT, Ahi);
Bhi = DAG.getNode(ISD::BITCAST, dl, MulVT, Bhi);
SDValue AloBlo = DAG.getNode(X86ISD::PMULUDQ, dl, VT, A, B);
SDValue AloBhi = DAG.getNode(X86ISD::PMULUDQ, dl, VT, A, Bhi);
SDValue AhiBlo = DAG.getNode(X86ISD::PMULUDQ, dl, VT, Ahi, B);
AloBhi = DAG.getNode(X86ISD::VSHLI, dl, VT, AloBhi, ShAmt);
AhiBlo = DAG.getNode(X86ISD::VSHLI, dl, VT, AhiBlo, ShAmt);
SDValue Res = DAG.getNode(ISD::ADD, dl, VT, AloBlo, AloBhi);
return DAG.getNode(ISD::ADD, dl, VT, Res, AhiBlo);
}
SDValue X86TargetLowering::LowerShift(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
SDValue R = Op.getOperand(0);
SDValue Amt = Op.getOperand(1);
LLVMContext *Context = DAG.getContext();
if (!Subtarget->hasSSE2())
return SDValue();
// Optimize shl/srl/sra with constant shift amount.
if (isSplatVector(Amt.getNode())) {
SDValue SclrAmt = Amt->getOperand(0);
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(SclrAmt)) {
uint64_t ShiftAmt = C->getZExtValue();
if (VT == MVT::v2i64 || VT == MVT::v4i32 || VT == MVT::v8i16 ||
(Subtarget->hasAVX2() &&
(VT == MVT::v4i64 || VT == MVT::v8i32 || VT == MVT::v16i16))) {
if (Op.getOpcode() == ISD::SHL)
return DAG.getNode(X86ISD::VSHLI, dl, VT, R,
DAG.getConstant(ShiftAmt, MVT::i32));
if (Op.getOpcode() == ISD::SRL)
return DAG.getNode(X86ISD::VSRLI, dl, VT, R,
DAG.getConstant(ShiftAmt, MVT::i32));
if (Op.getOpcode() == ISD::SRA && VT != MVT::v2i64 && VT != MVT::v4i64)
return DAG.getNode(X86ISD::VSRAI, dl, VT, R,
DAG.getConstant(ShiftAmt, MVT::i32));
}
if (VT == MVT::v16i8) {
if (Op.getOpcode() == ISD::SHL) {
// Make a large shift.
SDValue SHL = DAG.getNode(X86ISD::VSHLI, dl, MVT::v8i16, R,
DAG.getConstant(ShiftAmt, MVT::i32));
SHL = DAG.getNode(ISD::BITCAST, dl, VT, SHL);
// Zero out the rightmost bits.
SmallVector<SDValue, 16> V(16,
DAG.getConstant(uint8_t(-1U << ShiftAmt),
MVT::i8));
return DAG.getNode(ISD::AND, dl, VT, SHL,
DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &V[0], 16));
}
if (Op.getOpcode() == ISD::SRL) {
// Make a large shift.
SDValue SRL = DAG.getNode(X86ISD::VSRLI, dl, MVT::v8i16, R,
DAG.getConstant(ShiftAmt, MVT::i32));
SRL = DAG.getNode(ISD::BITCAST, dl, VT, SRL);
// Zero out the leftmost bits.
SmallVector<SDValue, 16> V(16,
DAG.getConstant(uint8_t(-1U) >> ShiftAmt,
MVT::i8));
return DAG.getNode(ISD::AND, dl, VT, SRL,
DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &V[0], 16));
}
if (Op.getOpcode() == ISD::SRA) {
if (ShiftAmt == 7) {
// R s>> 7 === R s< 0
SDValue Zeros = getZeroVector(VT, Subtarget, DAG, dl);
return DAG.getNode(X86ISD::PCMPGT, dl, VT, Zeros, R);
}
// R s>> a === ((R u>> a) ^ m) - m
SDValue Res = DAG.getNode(ISD::SRL, dl, VT, R, Amt);
SmallVector<SDValue, 16> V(16, DAG.getConstant(128 >> ShiftAmt,
MVT::i8));
SDValue Mask = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &V[0], 16);
Res = DAG.getNode(ISD::XOR, dl, VT, Res, Mask);
Res = DAG.getNode(ISD::SUB, dl, VT, Res, Mask);
return Res;
}
llvm_unreachable("Unknown shift opcode.");
}
if (Subtarget->hasAVX2() && VT == MVT::v32i8) {
if (Op.getOpcode() == ISD::SHL) {
// Make a large shift.
SDValue SHL = DAG.getNode(X86ISD::VSHLI, dl, MVT::v16i16, R,
DAG.getConstant(ShiftAmt, MVT::i32));
SHL = DAG.getNode(ISD::BITCAST, dl, VT, SHL);
// Zero out the rightmost bits.
SmallVector<SDValue, 32> V(32,
DAG.getConstant(uint8_t(-1U << ShiftAmt),
MVT::i8));
return DAG.getNode(ISD::AND, dl, VT, SHL,
DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &V[0], 32));
}
if (Op.getOpcode() == ISD::SRL) {
// Make a large shift.
SDValue SRL = DAG.getNode(X86ISD::VSRLI, dl, MVT::v16i16, R,
DAG.getConstant(ShiftAmt, MVT::i32));
SRL = DAG.getNode(ISD::BITCAST, dl, VT, SRL);
// Zero out the leftmost bits.
SmallVector<SDValue, 32> V(32,
DAG.getConstant(uint8_t(-1U) >> ShiftAmt,
MVT::i8));
return DAG.getNode(ISD::AND, dl, VT, SRL,
DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &V[0], 32));
}
if (Op.getOpcode() == ISD::SRA) {
if (ShiftAmt == 7) {
// R s>> 7 === R s< 0
SDValue Zeros = getZeroVector(VT, Subtarget, DAG, dl);
return DAG.getNode(X86ISD::PCMPGT, dl, VT, Zeros, R);
}
// R s>> a === ((R u>> a) ^ m) - m
SDValue Res = DAG.getNode(ISD::SRL, dl, VT, R, Amt);
SmallVector<SDValue, 32> V(32, DAG.getConstant(128 >> ShiftAmt,
MVT::i8));
SDValue Mask = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &V[0], 32);
Res = DAG.getNode(ISD::XOR, dl, VT, Res, Mask);
Res = DAG.getNode(ISD::SUB, dl, VT, Res, Mask);
return Res;
}
llvm_unreachable("Unknown shift opcode.");
}
}
}
// Lower SHL with variable shift amount.
if (VT == MVT::v4i32 && Op->getOpcode() == ISD::SHL) {
Op = DAG.getNode(X86ISD::VSHLI, dl, VT, Op.getOperand(1),
DAG.getConstant(23, MVT::i32));
const uint32_t CV[] = { 0x3f800000U, 0x3f800000U, 0x3f800000U, 0x3f800000U};
Constant *C = ConstantDataVector::get(*Context, CV);
SDValue CPIdx = DAG.getConstantPool(C, getPointerTy(), 16);
SDValue Addend = DAG.getLoad(VT, dl, DAG.getEntryNode(), CPIdx,
MachinePointerInfo::getConstantPool(),
false, false, false, 16);
Op = DAG.getNode(ISD::ADD, dl, VT, Op, Addend);
Op = DAG.getNode(ISD::BITCAST, dl, MVT::v4f32, Op);
Op = DAG.getNode(ISD::FP_TO_SINT, dl, VT, Op);
return DAG.getNode(ISD::MUL, dl, VT, Op, R);
}
if (VT == MVT::v16i8 && Op->getOpcode() == ISD::SHL) {
assert(Subtarget->hasSSE2() && "Need SSE2 for pslli/pcmpeq.");
// a = a << 5;
Op = DAG.getNode(X86ISD::VSHLI, dl, MVT::v8i16, Op.getOperand(1),
DAG.getConstant(5, MVT::i32));
Op = DAG.getNode(ISD::BITCAST, dl, VT, Op);
// Turn 'a' into a mask suitable for VSELECT
SDValue VSelM = DAG.getConstant(0x80, VT);
SDValue OpVSel = DAG.getNode(ISD::AND, dl, VT, VSelM, Op);
OpVSel = DAG.getNode(X86ISD::PCMPEQ, dl, VT, OpVSel, VSelM);
SDValue CM1 = DAG.getConstant(0x0f, VT);
SDValue CM2 = DAG.getConstant(0x3f, VT);
// r = VSELECT(r, psllw(r & (char16)15, 4), a);
SDValue M = DAG.getNode(ISD::AND, dl, VT, R, CM1);
M = getTargetVShiftNode(X86ISD::VSHLI, dl, MVT::v8i16, M,
DAG.getConstant(4, MVT::i32), DAG);
M = DAG.getNode(ISD::BITCAST, dl, VT, M);
R = DAG.getNode(ISD::VSELECT, dl, VT, OpVSel, M, R);
// a += a
Op = DAG.getNode(ISD::ADD, dl, VT, Op, Op);
OpVSel = DAG.getNode(ISD::AND, dl, VT, VSelM, Op);
OpVSel = DAG.getNode(X86ISD::PCMPEQ, dl, VT, OpVSel, VSelM);
// r = VSELECT(r, psllw(r & (char16)63, 2), a);
M = DAG.getNode(ISD::AND, dl, VT, R, CM2);
M = getTargetVShiftNode(X86ISD::VSHLI, dl, MVT::v8i16, M,
DAG.getConstant(2, MVT::i32), DAG);
M = DAG.getNode(ISD::BITCAST, dl, VT, M);
R = DAG.getNode(ISD::VSELECT, dl, VT, OpVSel, M, R);
// a += a
Op = DAG.getNode(ISD::ADD, dl, VT, Op, Op);
OpVSel = DAG.getNode(ISD::AND, dl, VT, VSelM, Op);
OpVSel = DAG.getNode(X86ISD::PCMPEQ, dl, VT, OpVSel, VSelM);
// return VSELECT(r, r+r, a);
R = DAG.getNode(ISD::VSELECT, dl, VT, OpVSel,
DAG.getNode(ISD::ADD, dl, VT, R, R), R);
return R;
}
// Decompose 256-bit shifts into smaller 128-bit shifts.
if (VT.getSizeInBits() == 256) {
unsigned NumElems = VT.getVectorNumElements();
MVT EltVT = VT.getVectorElementType().getSimpleVT();
EVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
// Extract the two vectors
SDValue V1 = Extract128BitVector(R, 0, DAG, dl);
SDValue V2 = Extract128BitVector(R, NumElems/2, DAG, dl);
// Recreate the shift amount vectors
SDValue Amt1, Amt2;
if (Amt.getOpcode() == ISD::BUILD_VECTOR) {
// Constant shift amount
SmallVector<SDValue, 4> Amt1Csts;
SmallVector<SDValue, 4> Amt2Csts;
for (unsigned i = 0; i != NumElems/2; ++i)
Amt1Csts.push_back(Amt->getOperand(i));
for (unsigned i = NumElems/2; i != NumElems; ++i)
Amt2Csts.push_back(Amt->getOperand(i));
Amt1 = DAG.getNode(ISD::BUILD_VECTOR, dl, NewVT,
&Amt1Csts[0], NumElems/2);
Amt2 = DAG.getNode(ISD::BUILD_VECTOR, dl, NewVT,
&Amt2Csts[0], NumElems/2);
} else {
// Variable shift amount
Amt1 = Extract128BitVector(Amt, 0, DAG, dl);
Amt2 = Extract128BitVector(Amt, NumElems/2, DAG, dl);
}
// Issue new vector shifts for the smaller types
V1 = DAG.getNode(Op.getOpcode(), dl, NewVT, V1, Amt1);
V2 = DAG.getNode(Op.getOpcode(), dl, NewVT, V2, Amt2);
// Concatenate the result back
return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, V1, V2);
}
return SDValue();
}
SDValue X86TargetLowering::LowerXALUO(SDValue Op, SelectionDAG &DAG) const {
// Lower the "add/sub/mul with overflow" instruction into a regular ins plus
// a "setcc" instruction that checks the overflow flag. The "brcond" lowering
// looks for this combo and may remove the "setcc" instruction if the "setcc"
// has only one use.
SDNode *N = Op.getNode();
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
unsigned BaseOp = 0;
unsigned Cond = 0;
DebugLoc DL = Op.getDebugLoc();
switch (Op.getOpcode()) {
default: llvm_unreachable("Unknown ovf instruction!");
case ISD::SADDO:
// A subtract of one will be selected as a INC. Note that INC doesn't
// set CF, so we can't do this for UADDO.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS))
if (C->isOne()) {
BaseOp = X86ISD::INC;
Cond = X86::COND_O;
break;
}
BaseOp = X86ISD::ADD;
Cond = X86::COND_O;
break;
case ISD::UADDO:
BaseOp = X86ISD::ADD;
Cond = X86::COND_B;
break;
case ISD::SSUBO:
// A subtract of one will be selected as a DEC. Note that DEC doesn't
// set CF, so we can't do this for USUBO.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS))
if (C->isOne()) {
BaseOp = X86ISD::DEC;
Cond = X86::COND_O;
break;
}
BaseOp = X86ISD::SUB;
Cond = X86::COND_O;
break;
case ISD::USUBO:
BaseOp = X86ISD::SUB;
Cond = X86::COND_B;
break;
case ISD::SMULO:
BaseOp = X86ISD::SMUL;
Cond = X86::COND_O;
break;
case ISD::UMULO: { // i64, i8 = umulo lhs, rhs --> i64, i64, i32 umul lhs,rhs
SDVTList VTs = DAG.getVTList(N->getValueType(0), N->getValueType(0),
MVT::i32);
SDValue Sum = DAG.getNode(X86ISD::UMUL, DL, VTs, LHS, RHS);
SDValue SetCC =
DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
DAG.getConstant(X86::COND_O, MVT::i32),
SDValue(Sum.getNode(), 2));
return DAG.getNode(ISD::MERGE_VALUES, DL, N->getVTList(), Sum, SetCC);
}
}
// Also sets EFLAGS.
SDVTList VTs = DAG.getVTList(N->getValueType(0), MVT::i32);
SDValue Sum = DAG.getNode(BaseOp, DL, VTs, LHS, RHS);
SDValue SetCC =
DAG.getNode(X86ISD::SETCC, DL, N->getValueType(1),
DAG.getConstant(Cond, MVT::i32),
SDValue(Sum.getNode(), 1));
return DAG.getNode(ISD::MERGE_VALUES, DL, N->getVTList(), Sum, SetCC);
}
SDValue X86TargetLowering::LowerSIGN_EXTEND_INREG(SDValue Op,
SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
EVT ExtraVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
EVT VT = Op.getValueType();
if (!Subtarget->hasSSE2() || !VT.isVector())
return SDValue();
unsigned BitsDiff = VT.getScalarType().getSizeInBits() -
ExtraVT.getScalarType().getSizeInBits();
SDValue ShAmt = DAG.getConstant(BitsDiff, MVT::i32);
switch (VT.getSimpleVT().SimpleTy) {
default: return SDValue();
case MVT::v8i32:
case MVT::v16i16:
if (!Subtarget->hasAVX())
return SDValue();
if (!Subtarget->hasAVX2()) {
// needs to be split
unsigned NumElems = VT.getVectorNumElements();
// Extract the LHS vectors
SDValue LHS = Op.getOperand(0);
SDValue LHS1 = Extract128BitVector(LHS, 0, DAG, dl);
SDValue LHS2 = Extract128BitVector(LHS, NumElems/2, DAG, dl);
MVT EltVT = VT.getVectorElementType().getSimpleVT();
EVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
EVT ExtraEltVT = ExtraVT.getVectorElementType();
int ExtraNumElems = ExtraVT.getVectorNumElements();
ExtraVT = EVT::getVectorVT(*DAG.getContext(), ExtraEltVT,
ExtraNumElems/2);
SDValue Extra = DAG.getValueType(ExtraVT);
LHS1 = DAG.getNode(Op.getOpcode(), dl, NewVT, LHS1, Extra);
LHS2 = DAG.getNode(Op.getOpcode(), dl, NewVT, LHS2, Extra);
return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, LHS1, LHS2);;
}
// fall through
case MVT::v4i32:
case MVT::v8i16: {
SDValue Tmp1 = getTargetVShiftNode(X86ISD::VSHLI, dl, VT,
Op.getOperand(0), ShAmt, DAG);
return getTargetVShiftNode(X86ISD::VSRAI, dl, VT, Tmp1, ShAmt, DAG);
}
}
}
SDValue X86TargetLowering::LowerMEMBARRIER(SDValue Op, SelectionDAG &DAG) const{
DebugLoc dl = Op.getDebugLoc();
// Go ahead and emit the fence on x86-64 even if we asked for no-sse2.
// There isn't any reason to disable it if the target processor supports it.
if (!Subtarget->hasSSE2() && !Subtarget->is64Bit()) {
SDValue Chain = Op.getOperand(0);
SDValue Zero = DAG.getConstant(0, MVT::i32);
SDValue Ops[] = {
DAG.getRegister(X86::ESP, MVT::i32), // Base
DAG.getTargetConstant(1, MVT::i8), // Scale
DAG.getRegister(0, MVT::i32), // Index
DAG.getTargetConstant(0, MVT::i32), // Disp
DAG.getRegister(0, MVT::i32), // Segment.
Zero,
Chain
};
SDNode *Res =
DAG.getMachineNode(X86::OR32mrLocked, dl, MVT::Other, Ops,
array_lengthof(Ops));
return SDValue(Res, 0);
}
unsigned isDev = cast<ConstantSDNode>(Op.getOperand(5))->getZExtValue();
if (!isDev)
return DAG.getNode(X86ISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0));
unsigned Op1 = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
unsigned Op2 = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue();
unsigned Op3 = cast<ConstantSDNode>(Op.getOperand(3))->getZExtValue();
unsigned Op4 = cast<ConstantSDNode>(Op.getOperand(4))->getZExtValue();
// def : Pat<(membarrier (i8 0), (i8 0), (i8 0), (i8 1), (i8 1)), (SFENCE)>;
if (!Op1 && !Op2 && !Op3 && Op4)
return DAG.getNode(X86ISD::SFENCE, dl, MVT::Other, Op.getOperand(0));
// def : Pat<(membarrier (i8 1), (i8 0), (i8 0), (i8 0), (i8 1)), (LFENCE)>;
if (Op1 && !Op2 && !Op3 && !Op4)
return DAG.getNode(X86ISD::LFENCE, dl, MVT::Other, Op.getOperand(0));
// def : Pat<(membarrier (i8 imm), (i8 imm), (i8 imm), (i8 imm), (i8 1)),
// (MFENCE)>;
return DAG.getNode(X86ISD::MFENCE, dl, MVT::Other, Op.getOperand(0));
}
SDValue X86TargetLowering::LowerATOMIC_FENCE(SDValue Op,
SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
AtomicOrdering FenceOrdering = static_cast<AtomicOrdering>(
cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue());
SynchronizationScope FenceScope = static_cast<SynchronizationScope>(
cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue());
// The only fence that needs an instruction is a sequentially-consistent
// cross-thread fence.
if (FenceOrdering == SequentiallyConsistent && FenceScope == CrossThread) {
// Use mfence if we have SSE2 or we're on x86-64 (even if we asked for
// no-sse2). There isn't any reason to disable it if the target processor
// supports it.
if (Subtarget->hasSSE2() || Subtarget->is64Bit())
return DAG.getNode(X86ISD::MFENCE, dl, MVT::Other, Op.getOperand(0));
SDValue Chain = Op.getOperand(0);
SDValue Zero = DAG.getConstant(0, MVT::i32);
SDValue Ops[] = {
DAG.getRegister(X86::ESP, MVT::i32), // Base
DAG.getTargetConstant(1, MVT::i8), // Scale
DAG.getRegister(0, MVT::i32), // Index
DAG.getTargetConstant(0, MVT::i32), // Disp
DAG.getRegister(0, MVT::i32), // Segment.
Zero,
Chain
};
SDNode *Res =
DAG.getMachineNode(X86::OR32mrLocked, dl, MVT::Other, Ops,
array_lengthof(Ops));
return SDValue(Res, 0);
}
// MEMBARRIER is a compiler barrier; it codegens to a no-op.
return DAG.getNode(X86ISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0));
}
SDValue X86TargetLowering::LowerCMP_SWAP(SDValue Op, SelectionDAG &DAG) const {
EVT T = Op.getValueType();
DebugLoc DL = Op.getDebugLoc();
unsigned Reg = 0;
unsigned size = 0;
switch(T.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid value type!");
case MVT::i8: Reg = X86::AL; size = 1; break;
case MVT::i16: Reg = X86::AX; size = 2; break;
case MVT::i32: Reg = X86::EAX; size = 4; break;
case MVT::i64:
assert(Subtarget->is64Bit() && "Node not type legal!");
Reg = X86::RAX; size = 8;
break;
}
SDValue cpIn = DAG.getCopyToReg(Op.getOperand(0), DL, Reg,
Op.getOperand(2), SDValue());
SDValue Ops[] = { cpIn.getValue(0),
Op.getOperand(1),
Op.getOperand(3),
DAG.getTargetConstant(size, MVT::i8),
cpIn.getValue(1) };
SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
MachineMemOperand *MMO = cast<AtomicSDNode>(Op)->getMemOperand();
SDValue Result = DAG.getMemIntrinsicNode(X86ISD::LCMPXCHG_DAG, DL, Tys,
Ops, 5, T, MMO);
SDValue cpOut =
DAG.getCopyFromReg(Result.getValue(0), DL, Reg, T, Result.getValue(1));
return cpOut;
}
SDValue X86TargetLowering::LowerREADCYCLECOUNTER(SDValue Op,
SelectionDAG &DAG) const {
assert(Subtarget->is64Bit() && "Result not type legalized?");
SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue TheChain = Op.getOperand(0);
DebugLoc dl = Op.getDebugLoc();
SDValue rd = DAG.getNode(X86ISD::RDTSC_DAG, dl, Tys, &TheChain, 1);
SDValue rax = DAG.getCopyFromReg(rd, dl, X86::RAX, MVT::i64, rd.getValue(1));
SDValue rdx = DAG.getCopyFromReg(rax.getValue(1), dl, X86::RDX, MVT::i64,
rax.getValue(2));
SDValue Tmp = DAG.getNode(ISD::SHL, dl, MVT::i64, rdx,
DAG.getConstant(32, MVT::i8));
SDValue Ops[] = {
DAG.getNode(ISD::OR, dl, MVT::i64, rax, Tmp),
rdx.getValue(1)
};
return DAG.getMergeValues(Ops, 2, dl);
}
SDValue X86TargetLowering::LowerBITCAST(SDValue Op,
SelectionDAG &DAG) const {
EVT SrcVT = Op.getOperand(0).getValueType();
EVT DstVT = Op.getValueType();
assert(Subtarget->is64Bit() && !Subtarget->hasSSE2() &&
Subtarget->hasMMX() && "Unexpected custom BITCAST");
assert((DstVT == MVT::i64 ||
(DstVT.isVector() && DstVT.getSizeInBits()==64)) &&
"Unexpected custom BITCAST");
// i64 <=> MMX conversions are Legal.
if (SrcVT==MVT::i64 && DstVT.isVector())
return Op;
if (DstVT==MVT::i64 && SrcVT.isVector())
return Op;
// MMX <=> MMX conversions are Legal.
if (SrcVT.isVector() && DstVT.isVector())
return Op;
// All other conversions need to be expanded.
return SDValue();
}
SDValue X86TargetLowering::LowerLOAD_SUB(SDValue Op, SelectionDAG &DAG) const {
SDNode *Node = Op.getNode();
DebugLoc dl = Node->getDebugLoc();
EVT T = Node->getValueType(0);
SDValue negOp = DAG.getNode(ISD::SUB, dl, T,
DAG.getConstant(0, T), Node->getOperand(2));
return DAG.getAtomic(ISD::ATOMIC_LOAD_ADD, dl,
cast<AtomicSDNode>(Node)->getMemoryVT(),
Node->getOperand(0),
Node->getOperand(1), negOp,
cast<AtomicSDNode>(Node)->getSrcValue(),
cast<AtomicSDNode>(Node)->getAlignment(),
cast<AtomicSDNode>(Node)->getOrdering(),
cast<AtomicSDNode>(Node)->getSynchScope());
}
static SDValue LowerATOMIC_STORE(SDValue Op, SelectionDAG &DAG) {
SDNode *Node = Op.getNode();
DebugLoc dl = Node->getDebugLoc();
EVT VT = cast<AtomicSDNode>(Node)->getMemoryVT();
// Convert seq_cst store -> xchg
// Convert wide store -> swap (-> cmpxchg8b/cmpxchg16b)
// FIXME: On 32-bit, store -> fist or movq would be more efficient
// (The only way to get a 16-byte store is cmpxchg16b)
// FIXME: 16-byte ATOMIC_SWAP isn't actually hooked up at the moment.
if (cast<AtomicSDNode>(Node)->getOrdering() == SequentiallyConsistent ||
!DAG.getTargetLoweringInfo().isTypeLegal(VT)) {
SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
cast<AtomicSDNode>(Node)->getMemoryVT(),
Node->getOperand(0),
Node->getOperand(1), Node->getOperand(2),
cast<AtomicSDNode>(Node)->getMemOperand(),
cast<AtomicSDNode>(Node)->getOrdering(),
cast<AtomicSDNode>(Node)->getSynchScope());
return Swap.getValue(1);
}
// Other atomic stores have a simple pattern.
return Op;
}
static SDValue LowerADDC_ADDE_SUBC_SUBE(SDValue Op, SelectionDAG &DAG) {
EVT VT = Op.getNode()->getValueType(0);
// Let legalize expand this if it isn't a legal type yet.
if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
return SDValue();
SDVTList VTs = DAG.getVTList(VT, MVT::i32);
unsigned Opc;
bool ExtraOp = false;
switch (Op.getOpcode()) {
default: llvm_unreachable("Invalid code");
case ISD::ADDC: Opc = X86ISD::ADD; break;
case ISD::ADDE: Opc = X86ISD::ADC; ExtraOp = true; break;
case ISD::SUBC: Opc = X86ISD::SUB; break;
case ISD::SUBE: Opc = X86ISD::SBB; ExtraOp = true; break;
}
if (!ExtraOp)
return DAG.getNode(Opc, Op->getDebugLoc(), VTs, Op.getOperand(0),
Op.getOperand(1));
return DAG.getNode(Opc, Op->getDebugLoc(), VTs, Op.getOperand(0),
Op.getOperand(1), Op.getOperand(2));
}
/// LowerOperation - Provide custom lowering hooks for some operations.
///
SDValue X86TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
switch (Op.getOpcode()) {
default: llvm_unreachable("Should not custom lower this!");
case ISD::SIGN_EXTEND_INREG: return LowerSIGN_EXTEND_INREG(Op,DAG);
case ISD::MEMBARRIER: return LowerMEMBARRIER(Op,DAG);
case ISD::ATOMIC_FENCE: return LowerATOMIC_FENCE(Op,DAG);
case ISD::ATOMIC_CMP_SWAP: return LowerCMP_SWAP(Op,DAG);
case ISD::ATOMIC_LOAD_SUB: return LowerLOAD_SUB(Op,DAG);
case ISD::ATOMIC_STORE: return LowerATOMIC_STORE(Op,DAG);
case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
case ISD::INSERT_VECTOR_ELT: return LowerINSERT_VECTOR_ELT(Op, DAG);
case ISD::EXTRACT_SUBVECTOR: return LowerEXTRACT_SUBVECTOR(Op, DAG);
case ISD::INSERT_SUBVECTOR: return LowerINSERT_SUBVECTOR(Op, DAG);
case ISD::SCALAR_TO_VECTOR: return LowerSCALAR_TO_VECTOR(Op, DAG);
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
case ISD::ExternalSymbol: return LowerExternalSymbol(Op, DAG);
case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
case ISD::SHL_PARTS:
case ISD::SRA_PARTS:
case ISD::SRL_PARTS: return LowerShiftParts(Op, DAG);
case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
case ISD::UINT_TO_FP: return LowerUINT_TO_FP(Op, DAG);
case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
case ISD::FP_TO_UINT: return LowerFP_TO_UINT(Op, DAG);
case ISD::FABS: return LowerFABS(Op, DAG);
case ISD::FNEG: return LowerFNEG(Op, DAG);
case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
case ISD::FGETSIGN: return LowerFGETSIGN(Op, DAG);
case ISD::SETCC: return LowerSETCC(Op, DAG);
case ISD::SELECT: return LowerSELECT(Op, DAG);
case ISD::BRCOND: return LowerBRCOND(Op, DAG);
case ISD::JumpTable: return LowerJumpTable(Op, DAG);
case ISD::VASTART: return LowerVASTART(Op, DAG);
case ISD::VAARG: return LowerVAARG(Op, DAG);
case ISD::VACOPY: return LowerVACOPY(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
case ISD::FRAME_TO_ARGS_OFFSET:
return LowerFRAME_TO_ARGS_OFFSET(Op, DAG);
case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
case ISD::EH_RETURN: return LowerEH_RETURN(Op, DAG);
case ISD::INIT_TRAMPOLINE: return LowerINIT_TRAMPOLINE(Op, DAG);
case ISD::ADJUST_TRAMPOLINE: return LowerADJUST_TRAMPOLINE(Op, DAG);
case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
case ISD::CTLZ: return LowerCTLZ(Op, DAG);
case ISD::CTLZ_ZERO_UNDEF: return LowerCTLZ_ZERO_UNDEF(Op, DAG);
case ISD::CTTZ: return LowerCTTZ(Op, DAG);
case ISD::MUL: return LowerMUL(Op, DAG);
case ISD::SRA:
case ISD::SRL:
case ISD::SHL: return LowerShift(Op, DAG);
case ISD::SADDO:
case ISD::UADDO:
case ISD::SSUBO:
case ISD::USUBO:
case ISD::SMULO:
case ISD::UMULO: return LowerXALUO(Op, DAG);
case ISD::READCYCLECOUNTER: return LowerREADCYCLECOUNTER(Op, DAG);
case ISD::BITCAST: return LowerBITCAST(Op, DAG);
case ISD::ADDC:
case ISD::ADDE:
case ISD::SUBC:
case ISD::SUBE: return LowerADDC_ADDE_SUBC_SUBE(Op, DAG);
case ISD::ADD: return LowerADD(Op, DAG);
case ISD::SUB: return LowerSUB(Op, DAG);
}
}
static void ReplaceATOMIC_LOAD(SDNode *Node,
SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) {
DebugLoc dl = Node->getDebugLoc();
EVT VT = cast<AtomicSDNode>(Node)->getMemoryVT();
// Convert wide load -> cmpxchg8b/cmpxchg16b
// FIXME: On 32-bit, load -> fild or movq would be more efficient
// (The only way to get a 16-byte load is cmpxchg16b)
// FIXME: 16-byte ATOMIC_CMP_SWAP isn't actually hooked up at the moment.
SDValue Zero = DAG.getConstant(0, VT);
SDValue Swap = DAG.getAtomic(ISD::ATOMIC_CMP_SWAP, dl, VT,
Node->getOperand(0),
Node->getOperand(1), Zero, Zero,
cast<AtomicSDNode>(Node)->getMemOperand(),
cast<AtomicSDNode>(Node)->getOrdering(),
cast<AtomicSDNode>(Node)->getSynchScope());
Results.push_back(Swap.getValue(0));
Results.push_back(Swap.getValue(1));
}
void X86TargetLowering::
ReplaceATOMIC_BINARY_64(SDNode *Node, SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG, unsigned NewOp) const {
DebugLoc dl = Node->getDebugLoc();
assert (Node->getValueType(0) == MVT::i64 &&
"Only know how to expand i64 atomics");
SDValue Chain = Node->getOperand(0);
SDValue In1 = Node->getOperand(1);
SDValue In2L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
Node->getOperand(2), DAG.getIntPtrConstant(0));
SDValue In2H = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
Node->getOperand(2), DAG.getIntPtrConstant(1));
SDValue Ops[] = { Chain, In1, In2L, In2H };
SDVTList Tys = DAG.getVTList(MVT::i32, MVT::i32, MVT::Other);
SDValue Result =
DAG.getMemIntrinsicNode(NewOp, dl, Tys, Ops, 4, MVT::i64,
cast<MemSDNode>(Node)->getMemOperand());
SDValue OpsF[] = { Result.getValue(0), Result.getValue(1)};
Results.push_back(DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, OpsF, 2));
Results.push_back(Result.getValue(2));
}
/// ReplaceNodeResults - Replace a node with an illegal result type
/// with a new node built out of custom code.
void X86TargetLowering::ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG) const {
DebugLoc dl = N->getDebugLoc();
switch (N->getOpcode()) {
default:
llvm_unreachable("Do not know how to custom type legalize this operation!");
case ISD::SIGN_EXTEND_INREG:
case ISD::ADDC:
case ISD::ADDE:
case ISD::SUBC:
case ISD::SUBE:
// We don't want to expand or promote these.
return;
case ISD::FP_TO_SINT:
case ISD::FP_TO_UINT: {
bool IsSigned = N->getOpcode() == ISD::FP_TO_SINT;
if (!IsSigned && !isIntegerTypeFTOL(SDValue(N, 0).getValueType()))
return;
std::pair<SDValue,SDValue> Vals =
FP_TO_INTHelper(SDValue(N, 0), DAG, IsSigned, /*IsReplace=*/ true);
SDValue FIST = Vals.first, StackSlot = Vals.second;
if (FIST.getNode() != 0) {
EVT VT = N->getValueType(0);
// Return a load from the stack slot.
if (StackSlot.getNode() != 0)
Results.push_back(DAG.getLoad(VT, dl, FIST, StackSlot,
MachinePointerInfo(),
false, false, false, 0));
else
Results.push_back(FIST);
}
return;
}
case ISD::READCYCLECOUNTER: {
SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue TheChain = N->getOperand(0);
SDValue rd = DAG.getNode(X86ISD::RDTSC_DAG, dl, Tys, &TheChain, 1);
SDValue eax = DAG.getCopyFromReg(rd, dl, X86::EAX, MVT::i32,
rd.getValue(1));
SDValue edx = DAG.getCopyFromReg(eax.getValue(1), dl, X86::EDX, MVT::i32,
eax.getValue(2));
// Use a buildpair to merge the two 32-bit values into a 64-bit one.
SDValue Ops[] = { eax, edx };
Results.push_back(DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Ops, 2));
Results.push_back(edx.getValue(1));
return;
}
case ISD::ATOMIC_CMP_SWAP: {
EVT T = N->getValueType(0);
assert((T == MVT::i64 || T == MVT::i128) && "can only expand cmpxchg pair");
bool Regs64bit = T == MVT::i128;
EVT HalfT = Regs64bit ? MVT::i64 : MVT::i32;
SDValue cpInL, cpInH;
cpInL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(2),
DAG.getConstant(0, HalfT));
cpInH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(2),
DAG.getConstant(1, HalfT));
cpInL = DAG.getCopyToReg(N->getOperand(0), dl,
Regs64bit ? X86::RAX : X86::EAX,
cpInL, SDValue());
cpInH = DAG.getCopyToReg(cpInL.getValue(0), dl,
Regs64bit ? X86::RDX : X86::EDX,
cpInH, cpInL.getValue(1));
SDValue swapInL, swapInH;
swapInL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(3),
DAG.getConstant(0, HalfT));
swapInH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(3),
DAG.getConstant(1, HalfT));
swapInL = DAG.getCopyToReg(cpInH.getValue(0), dl,
Regs64bit ? X86::RBX : X86::EBX,
swapInL, cpInH.getValue(1));
swapInH = DAG.getCopyToReg(swapInL.getValue(0), dl,
Regs64bit ? X86::RCX : X86::ECX,
swapInH, swapInL.getValue(1));
SDValue Ops[] = { swapInH.getValue(0),
N->getOperand(1),
swapInH.getValue(1) };
SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
MachineMemOperand *MMO = cast<AtomicSDNode>(N)->getMemOperand();
unsigned Opcode = Regs64bit ? X86ISD::LCMPXCHG16_DAG :
X86ISD::LCMPXCHG8_DAG;
SDValue Result = DAG.getMemIntrinsicNode(Opcode, dl, Tys,
Ops, 3, T, MMO);
SDValue cpOutL = DAG.getCopyFromReg(Result.getValue(0), dl,
Regs64bit ? X86::RAX : X86::EAX,
HalfT, Result.getValue(1));
SDValue cpOutH = DAG.getCopyFromReg(cpOutL.getValue(1), dl,
Regs64bit ? X86::RDX : X86::EDX,
HalfT, cpOutL.getValue(2));
SDValue OpsF[] = { cpOutL.getValue(0), cpOutH.getValue(0)};
Results.push_back(DAG.getNode(ISD::BUILD_PAIR, dl, T, OpsF, 2));
Results.push_back(cpOutH.getValue(1));
return;
}
case ISD::ATOMIC_LOAD_ADD:
ReplaceATOMIC_BINARY_64(N, Results, DAG, X86ISD::ATOMADD64_DAG);
return;
case ISD::ATOMIC_LOAD_AND:
ReplaceATOMIC_BINARY_64(N, Results, DAG, X86ISD::ATOMAND64_DAG);
return;
case ISD::ATOMIC_LOAD_NAND:
ReplaceATOMIC_BINARY_64(N, Results, DAG, X86ISD::ATOMNAND64_DAG);
return;
case ISD::ATOMIC_LOAD_OR:
ReplaceATOMIC_BINARY_64(N, Results, DAG, X86ISD::ATOMOR64_DAG);
return;
case ISD::ATOMIC_LOAD_SUB:
ReplaceATOMIC_BINARY_64(N, Results, DAG, X86ISD::ATOMSUB64_DAG);
return;
case ISD::ATOMIC_LOAD_XOR:
ReplaceATOMIC_BINARY_64(N, Results, DAG, X86ISD::ATOMXOR64_DAG);
return;
case ISD::ATOMIC_SWAP:
ReplaceATOMIC_BINARY_64(N, Results, DAG, X86ISD::ATOMSWAP64_DAG);
return;
case ISD::ATOMIC_LOAD:
ReplaceATOMIC_LOAD(N, Results, DAG);
}
}
const char *X86TargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return NULL;
case X86ISD::BSF: return "X86ISD::BSF";
case X86ISD::BSR: return "X86ISD::BSR";
case X86ISD::SHLD: return "X86ISD::SHLD";
case X86ISD::SHRD: return "X86ISD::SHRD";
case X86ISD::FAND: return "X86ISD::FAND";
case X86ISD::FOR: return "X86ISD::FOR";
case X86ISD::FXOR: return "X86ISD::FXOR";
case X86ISD::FSRL: return "X86ISD::FSRL";
case X86ISD::FILD: return "X86ISD::FILD";
case X86ISD::FILD_FLAG: return "X86ISD::FILD_FLAG";
case X86ISD::FP_TO_INT16_IN_MEM: return "X86ISD::FP_TO_INT16_IN_MEM";
case X86ISD::FP_TO_INT32_IN_MEM: return "X86ISD::FP_TO_INT32_IN_MEM";
case X86ISD::FP_TO_INT64_IN_MEM: return "X86ISD::FP_TO_INT64_IN_MEM";
case X86ISD::FLD: return "X86ISD::FLD";
case X86ISD::FST: return "X86ISD::FST";
case X86ISD::CALL: return "X86ISD::CALL";
case X86ISD::RDTSC_DAG: return "X86ISD::RDTSC_DAG";
case X86ISD::BT: return "X86ISD::BT";
case X86ISD::CMP: return "X86ISD::CMP";
case X86ISD::COMI: return "X86ISD::COMI";
case X86ISD::UCOMI: return "X86ISD::UCOMI";
case X86ISD::SETCC: return "X86ISD::SETCC";
case X86ISD::SETCC_CARRY: return "X86ISD::SETCC_CARRY";
case X86ISD::FSETCCsd: return "X86ISD::FSETCCsd";
case X86ISD::FSETCCss: return "X86ISD::FSETCCss";
case X86ISD::CMOV: return "X86ISD::CMOV";
case X86ISD::BRCOND: return "X86ISD::BRCOND";
case X86ISD::RET_FLAG: return "X86ISD::RET_FLAG";
case X86ISD::REP_STOS: return "X86ISD::REP_STOS";
case X86ISD::REP_MOVS: return "X86ISD::REP_MOVS";
case X86ISD::GlobalBaseReg: return "X86ISD::GlobalBaseReg";
case X86ISD::Wrapper: return "X86ISD::Wrapper";
case X86ISD::WrapperRIP: return "X86ISD::WrapperRIP";
case X86ISD::PEXTRB: return "X86ISD::PEXTRB";
case X86ISD::PEXTRW: return "X86ISD::PEXTRW";
case X86ISD::INSERTPS: return "X86ISD::INSERTPS";
case X86ISD::PINSRB: return "X86ISD::PINSRB";
case X86ISD::PINSRW: return "X86ISD::PINSRW";
case X86ISD::PSHUFB: return "X86ISD::PSHUFB";
case X86ISD::ANDNP: return "X86ISD::ANDNP";
case X86ISD::PSIGN: return "X86ISD::PSIGN";
case X86ISD::BLENDV: return "X86ISD::BLENDV";
case X86ISD::BLENDPW: return "X86ISD::BLENDPW";
case X86ISD::BLENDPS: return "X86ISD::BLENDPS";
case X86ISD::BLENDPD: return "X86ISD::BLENDPD";
case X86ISD::HADD: return "X86ISD::HADD";
case X86ISD::HSUB: return "X86ISD::HSUB";
case X86ISD::FHADD: return "X86ISD::FHADD";
case X86ISD::FHSUB: return "X86ISD::FHSUB";
case X86ISD::FMAX: return "X86ISD::FMAX";
case X86ISD::FMIN: return "X86ISD::FMIN";
case X86ISD::FRSQRT: return "X86ISD::FRSQRT";
case X86ISD::FRCP: return "X86ISD::FRCP";
case X86ISD::TLSADDR: return "X86ISD::TLSADDR";
case X86ISD::TLSCALL: return "X86ISD::TLSCALL";
case X86ISD::EH_RETURN: return "X86ISD::EH_RETURN";
case X86ISD::TC_RETURN: return "X86ISD::TC_RETURN";
case X86ISD::FNSTCW16m: return "X86ISD::FNSTCW16m";
case X86ISD::FNSTSW16r: return "X86ISD::FNSTSW16r";
case X86ISD::LCMPXCHG_DAG: return "X86ISD::LCMPXCHG_DAG";
case X86ISD::LCMPXCHG8_DAG: return "X86ISD::LCMPXCHG8_DAG";
case X86ISD::ATOMADD64_DAG: return "X86ISD::ATOMADD64_DAG";
case X86ISD::ATOMSUB64_DAG: return "X86ISD::ATOMSUB64_DAG";
case X86ISD::ATOMOR64_DAG: return "X86ISD::ATOMOR64_DAG";
case X86ISD::ATOMXOR64_DAG: return "X86ISD::ATOMXOR64_DAG";
case X86ISD::ATOMAND64_DAG: return "X86ISD::ATOMAND64_DAG";
case X86ISD::ATOMNAND64_DAG: return "X86ISD::ATOMNAND64_DAG";
case X86ISD::VZEXT_MOVL: return "X86ISD::VZEXT_MOVL";
case X86ISD::VZEXT_LOAD: return "X86ISD::VZEXT_LOAD";
case X86ISD::VSHLDQ: return "X86ISD::VSHLDQ";
case X86ISD::VSRLDQ: return "X86ISD::VSRLDQ";
case X86ISD::VSHL: return "X86ISD::VSHL";
case X86ISD::VSRL: return "X86ISD::VSRL";
case X86ISD::VSRA: return "X86ISD::VSRA";
case X86ISD::VSHLI: return "X86ISD::VSHLI";
case X86ISD::VSRLI: return "X86ISD::VSRLI";
case X86ISD::VSRAI: return "X86ISD::VSRAI";
case X86ISD::CMPP: return "X86ISD::CMPP";
case X86ISD::PCMPEQ: return "X86ISD::PCMPEQ";
case X86ISD::PCMPGT: return "X86ISD::PCMPGT";
case X86ISD::ADD: return "X86ISD::ADD";
case X86ISD::SUB: return "X86ISD::SUB";
case X86ISD::ADC: return "X86ISD::ADC";
case X86ISD::SBB: return "X86ISD::SBB";
case X86ISD::SMUL: return "X86ISD::SMUL";
case X86ISD::UMUL: return "X86ISD::UMUL";
case X86ISD::INC: return "X86ISD::INC";
case X86ISD::DEC: return "X86ISD::DEC";
case X86ISD::OR: return "X86ISD::OR";
case X86ISD::XOR: return "X86ISD::XOR";
case X86ISD::AND: return "X86ISD::AND";
case X86ISD::ANDN: return "X86ISD::ANDN";
case X86ISD::BLSI: return "X86ISD::BLSI";
case X86ISD::BLSMSK: return "X86ISD::BLSMSK";
case X86ISD::BLSR: return "X86ISD::BLSR";
case X86ISD::MUL_IMM: return "X86ISD::MUL_IMM";
case X86ISD::PTEST: return "X86ISD::PTEST";
case X86ISD::TESTP: return "X86ISD::TESTP";
case X86ISD::PALIGN: return "X86ISD::PALIGN";
case X86ISD::PSHUFD: return "X86ISD::PSHUFD";
case X86ISD::PSHUFHW: return "X86ISD::PSHUFHW";
case X86ISD::PSHUFLW: return "X86ISD::PSHUFLW";
case X86ISD::SHUFP: return "X86ISD::SHUFP";
case X86ISD::MOVLHPS: return "X86ISD::MOVLHPS";
case X86ISD::MOVLHPD: return "X86ISD::MOVLHPD";
case X86ISD::MOVHLPS: return "X86ISD::MOVHLPS";
case X86ISD::MOVLPS: return "X86ISD::MOVLPS";
case X86ISD::MOVLPD: return "X86ISD::MOVLPD";
case X86ISD::MOVDDUP: return "X86ISD::MOVDDUP";
case X86ISD::MOVSHDUP: return "X86ISD::MOVSHDUP";
case X86ISD::MOVSLDUP: return "X86ISD::MOVSLDUP";
case X86ISD::MOVSD: return "X86ISD::MOVSD";
case X86ISD::MOVSS: return "X86ISD::MOVSS";
case X86ISD::UNPCKL: return "X86ISD::UNPCKL";
case X86ISD::UNPCKH: return "X86ISD::UNPCKH";
case X86ISD::VBROADCAST: return "X86ISD::VBROADCAST";
case X86ISD::VPERMILP: return "X86ISD::VPERMILP";
case X86ISD::VPERM2X128: return "X86ISD::VPERM2X128";
case X86ISD::VPERMV: return "X86ISD::VPERMV";
case X86ISD::VPERMI: return "X86ISD::VPERMI";
case X86ISD::PMULUDQ: return "X86ISD::PMULUDQ";
case X86ISD::VASTART_SAVE_XMM_REGS: return "X86ISD::VASTART_SAVE_XMM_REGS";
case X86ISD::VAARG_64: return "X86ISD::VAARG_64";
case X86ISD::WIN_ALLOCA: return "X86ISD::WIN_ALLOCA";
case X86ISD::MEMBARRIER: return "X86ISD::MEMBARRIER";
case X86ISD::SEG_ALLOCA: return "X86ISD::SEG_ALLOCA";
case X86ISD::WIN_FTOL: return "X86ISD::WIN_FTOL";
case X86ISD::SAHF: return "X86ISD::SAHF";
}
}
// isLegalAddressingMode - Return true if the addressing mode represented
// by AM is legal for this target, for a load/store of the specified type.
bool X86TargetLowering::isLegalAddressingMode(const AddrMode &AM,
Type *Ty) const {
// X86 supports extremely general addressing modes.
CodeModel::Model M = getTargetMachine().getCodeModel();
Reloc::Model R = getTargetMachine().getRelocationModel();
// X86 allows a sign-extended 32-bit immediate field as a displacement.
if (!X86::isOffsetSuitableForCodeModel(AM.BaseOffs, M, AM.BaseGV != NULL))
return false;
if (AM.BaseGV) {
unsigned GVFlags =
Subtarget->ClassifyGlobalReference(AM.BaseGV, getTargetMachine());
// If a reference to this global requires an extra load, we can't fold it.
if (isGlobalStubReference(GVFlags))
return false;
// If BaseGV requires a register for the PIC base, we cannot also have a
// BaseReg specified.
if (AM.HasBaseReg && isGlobalRelativeToPICBase(GVFlags))
return false;
// If lower 4G is not available, then we must use rip-relative addressing.
if ((M != CodeModel::Small || R != Reloc::Static) &&
Subtarget->is64Bit() && (AM.BaseOffs || AM.Scale > 1))
return false;
}
switch (AM.Scale) {
case 0:
case 1:
case 2:
case 4:
case 8:
// These scales always work.
break;
case 3:
case 5:
case 9:
// These scales are formed with basereg+scalereg. Only accept if there is
// no basereg yet.
if (AM.HasBaseReg)
return false;
break;
default: // Other stuff never works.
return false;
}
return true;
}
bool X86TargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const {
if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
return false;
unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
if (NumBits1 <= NumBits2)
return false;
return true;
}
bool X86TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
if (!VT1.isInteger() || !VT2.isInteger())
return false;
unsigned NumBits1 = VT1.getSizeInBits();
unsigned NumBits2 = VT2.getSizeInBits();
if (NumBits1 <= NumBits2)
return false;
return true;
}
bool X86TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const {
// x86-64 implicitly zero-extends 32-bit results in 64-bit registers.
return Ty1->isIntegerTy(32) && Ty2->isIntegerTy(64) && Subtarget->is64Bit();
}
bool X86TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
// x86-64 implicitly zero-extends 32-bit results in 64-bit registers.
return VT1 == MVT::i32 && VT2 == MVT::i64 && Subtarget->is64Bit();
}
bool X86TargetLowering::isNarrowingProfitable(EVT VT1, EVT VT2) const {
// i16 instructions are longer (0x66 prefix) and potentially slower.
return !(VT1 == MVT::i32 && VT2 == MVT::i16);
}
/// isShuffleMaskLegal - Targets can use this to indicate that they only
/// support *some* VECTOR_SHUFFLE operations, those with specific masks.
/// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
/// are assumed to be legal.
bool
X86TargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
EVT VT) const {
// Very little shuffling can be done for 64-bit vectors right now.
if (VT.getSizeInBits() == 64)
return false;
// FIXME: pshufb, blends, shifts.
return (VT.getVectorNumElements() == 2 ||
ShuffleVectorSDNode::isSplatMask(&M[0], VT) ||
isMOVLMask(M, VT) ||
isSHUFPMask(M, VT, Subtarget->hasAVX()) ||
isPSHUFDMask(M, VT) ||
isPSHUFHWMask(M, VT, Subtarget->hasAVX2()) ||
isPSHUFLWMask(M, VT, Subtarget->hasAVX2()) ||
isPALIGNRMask(M, VT, Subtarget) ||
isUNPCKLMask(M, VT, Subtarget->hasAVX2()) ||
isUNPCKHMask(M, VT, Subtarget->hasAVX2()) ||
isUNPCKL_v_undef_Mask(M, VT, Subtarget->hasAVX2()) ||
isUNPCKH_v_undef_Mask(M, VT, Subtarget->hasAVX2()));
}
bool
X86TargetLowering::isVectorClearMaskLegal(const SmallVectorImpl<int> &Mask,
EVT VT) const {
unsigned NumElts = VT.getVectorNumElements();
// FIXME: This collection of masks seems suspect.
if (NumElts == 2)
return true;
if (NumElts == 4 && VT.getSizeInBits() == 128) {
return (isMOVLMask(Mask, VT) ||
isCommutedMOVLMask(Mask, VT, true) ||
isSHUFPMask(Mask, VT, Subtarget->hasAVX()) ||
isSHUFPMask(Mask, VT, Subtarget->hasAVX(), /* Commuted */ true));
}
return false;
}
//===----------------------------------------------------------------------===//
// X86 Scheduler Hooks
//===----------------------------------------------------------------------===//
// private utility function
MachineBasicBlock *
X86TargetLowering::EmitAtomicBitwiseWithCustomInserter(MachineInstr *bInstr,
MachineBasicBlock *MBB,
unsigned regOpc,
unsigned immOpc,
unsigned LoadOpc,
unsigned CXchgOpc,
unsigned notOpc,
unsigned EAXreg,
const TargetRegisterClass *RC,
bool Invert) const {
// For the atomic bitwise operator, we generate
// thisMBB:
// newMBB:
// ld t1 = [bitinstr.addr]
// op t2 = t1, [bitinstr.val]
// not t3 = t2 (if Invert)
// mov EAX = t1
// lcs dest = [bitinstr.addr], t3 [EAX is implicit]
// bz newMBB
// fallthrough -->nextMBB
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
const BasicBlock *LLVM_BB = MBB->getBasicBlock();
MachineFunction::iterator MBBIter = MBB;
++MBBIter;
/// First build the CFG
MachineFunction *F = MBB->getParent();
MachineBasicBlock *thisMBB = MBB;
MachineBasicBlock *newMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *nextMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(MBBIter, newMBB);
F->insert(MBBIter, nextMBB);
// Transfer the remainder of thisMBB and its successor edges to nextMBB.
nextMBB->splice(nextMBB->begin(), thisMBB,
llvm::next(MachineBasicBlock::iterator(bInstr)),
thisMBB->end());
nextMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
// Update thisMBB to fall through to newMBB
thisMBB->addSuccessor(newMBB);
// newMBB jumps to itself and fall through to nextMBB
newMBB->addSuccessor(nextMBB);
newMBB->addSuccessor(newMBB);
// Insert instructions into newMBB based on incoming instruction
assert(bInstr->getNumOperands() < X86::AddrNumOperands + 4 &&
"unexpected number of operands");
DebugLoc dl = bInstr->getDebugLoc();
MachineOperand& destOper = bInstr->getOperand(0);
MachineOperand* argOpers[2 + X86::AddrNumOperands];
int numArgs = bInstr->getNumOperands() - 1;
for (int i=0; i < numArgs; ++i)
argOpers[i] = &bInstr->getOperand(i+1);
// x86 address has 4 operands: base, index, scale, and displacement
int lastAddrIndx = X86::AddrNumOperands - 1; // [0,3]
int valArgIndx = lastAddrIndx + 1;
unsigned t1 = F->getRegInfo().createVirtualRegister(RC);
MachineInstrBuilder MIB = BuildMI(newMBB, dl, TII->get(LoadOpc), t1);
for (int i=0; i <= lastAddrIndx; ++i)
(*MIB).addOperand(*argOpers[i]);
unsigned t2 = F->getRegInfo().createVirtualRegister(RC);
assert((argOpers[valArgIndx]->isReg() ||
argOpers[valArgIndx]->isImm()) &&
"invalid operand");
if (argOpers[valArgIndx]->isReg())
MIB = BuildMI(newMBB, dl, TII->get(regOpc), t2);
else
MIB = BuildMI(newMBB, dl, TII->get(immOpc), t2);
MIB.addReg(t1);
(*MIB).addOperand(*argOpers[valArgIndx]);
unsigned t3 = F->getRegInfo().createVirtualRegister(RC);
if (Invert) {
MIB = BuildMI(newMBB, dl, TII->get(notOpc), t3).addReg(t2);
}
else
t3 = t2;
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), EAXreg);
MIB.addReg(t1);
MIB = BuildMI(newMBB, dl, TII->get(CXchgOpc));
for (int i=0; i <= lastAddrIndx; ++i)
(*MIB).addOperand(*argOpers[i]);
MIB.addReg(t3);
assert(bInstr->hasOneMemOperand() && "Unexpected number of memoperand");
(*MIB).setMemRefs(bInstr->memoperands_begin(),
bInstr->memoperands_end());
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), destOper.getReg());
MIB.addReg(EAXreg);
// insert branch
BuildMI(newMBB, dl, TII->get(X86::JNE_4)).addMBB(newMBB);
bInstr->eraseFromParent(); // The pseudo instruction is gone now.
return nextMBB;
}
// private utility function: 64 bit atomics on 32 bit host.
MachineBasicBlock *
X86TargetLowering::EmitAtomicBit6432WithCustomInserter(MachineInstr *bInstr,
MachineBasicBlock *MBB,
unsigned regOpcL,
unsigned regOpcH,
unsigned immOpcL,
unsigned immOpcH,
bool Invert) const {
// For the atomic bitwise operator, we generate
// thisMBB (instructions are in pairs, except cmpxchg8b)
// ld t1,t2 = [bitinstr.addr]
// newMBB:
// out1, out2 = phi (thisMBB, t1/t2) (newMBB, t3/t4)
// op t5, t6 <- out1, out2, [bitinstr.val]
// (for SWAP, substitute: mov t5, t6 <- [bitinstr.val])
// neg t7, t8 < t5, t6 (if Invert)
// mov ECX, EBX <- t5, t6
// mov EAX, EDX <- t1, t2
// cmpxchg8b [bitinstr.addr] [EAX, EDX, EBX, ECX implicit]
// mov t3, t4 <- EAX, EDX
// bz newMBB
// result in out1, out2
// fallthrough -->nextMBB
const TargetRegisterClass *RC = &X86::GR32RegClass;
const unsigned LoadOpc = X86::MOV32rm;
const unsigned NotOpc = X86::NOT32r;
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
const BasicBlock *LLVM_BB = MBB->getBasicBlock();
MachineFunction::iterator MBBIter = MBB;
++MBBIter;
/// First build the CFG
MachineFunction *F = MBB->getParent();
MachineBasicBlock *thisMBB = MBB;
MachineBasicBlock *newMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *nextMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(MBBIter, newMBB);
F->insert(MBBIter, nextMBB);
// Transfer the remainder of thisMBB and its successor edges to nextMBB.
nextMBB->splice(nextMBB->begin(), thisMBB,
llvm::next(MachineBasicBlock::iterator(bInstr)),
thisMBB->end());
nextMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
// Update thisMBB to fall through to newMBB
thisMBB->addSuccessor(newMBB);
// newMBB jumps to itself and fall through to nextMBB
newMBB->addSuccessor(nextMBB);
newMBB->addSuccessor(newMBB);
DebugLoc dl = bInstr->getDebugLoc();
// Insert instructions into newMBB based on incoming instruction
// There are 8 "real" operands plus 9 implicit def/uses, ignored here.
assert(bInstr->getNumOperands() < X86::AddrNumOperands + 14 &&
"unexpected number of operands");
MachineOperand& dest1Oper = bInstr->getOperand(0);
MachineOperand& dest2Oper = bInstr->getOperand(1);
MachineOperand* argOpers[2 + X86::AddrNumOperands];
for (int i=0; i < 2 + X86::AddrNumOperands; ++i) {
argOpers[i] = &bInstr->getOperand(i+2);
// We use some of the operands multiple times, so conservatively just
// clear any kill flags that might be present.
if (argOpers[i]->isReg() && argOpers[i]->isUse())
argOpers[i]->setIsKill(false);
}
// x86 address has 5 operands: base, index, scale, displacement, and segment.
int lastAddrIndx = X86::AddrNumOperands - 1; // [0,3]
unsigned t1 = F->getRegInfo().createVirtualRegister(RC);
MachineInstrBuilder MIB = BuildMI(thisMBB, dl, TII->get(LoadOpc), t1);
for (int i=0; i <= lastAddrIndx; ++i)
(*MIB).addOperand(*argOpers[i]);
unsigned t2 = F->getRegInfo().createVirtualRegister(RC);
MIB = BuildMI(thisMBB, dl, TII->get(LoadOpc), t2);
// add 4 to displacement.
for (int i=0; i <= lastAddrIndx-2; ++i)
(*MIB).addOperand(*argOpers[i]);
MachineOperand newOp3 = *(argOpers[3]);
if (newOp3.isImm())
newOp3.setImm(newOp3.getImm()+4);
else
newOp3.setOffset(newOp3.getOffset()+4);
(*MIB).addOperand(newOp3);
(*MIB).addOperand(*argOpers[lastAddrIndx]);
// t3/4 are defined later, at the bottom of the loop
unsigned t3 = F->getRegInfo().createVirtualRegister(RC);
unsigned t4 = F->getRegInfo().createVirtualRegister(RC);
BuildMI(newMBB, dl, TII->get(X86::PHI), dest1Oper.getReg())
.addReg(t1).addMBB(thisMBB).addReg(t3).addMBB(newMBB);
BuildMI(newMBB, dl, TII->get(X86::PHI), dest2Oper.getReg())
.addReg(t2).addMBB(thisMBB).addReg(t4).addMBB(newMBB);
// The subsequent operations should be using the destination registers of
// the PHI instructions.
t1 = dest1Oper.getReg();
t2 = dest2Oper.getReg();
int valArgIndx = lastAddrIndx + 1;
assert((argOpers[valArgIndx]->isReg() ||
argOpers[valArgIndx]->isImm()) &&
"invalid operand");
unsigned t5 = F->getRegInfo().createVirtualRegister(RC);
unsigned t6 = F->getRegInfo().createVirtualRegister(RC);
if (argOpers[valArgIndx]->isReg())
MIB = BuildMI(newMBB, dl, TII->get(regOpcL), t5);
else
MIB = BuildMI(newMBB, dl, TII->get(immOpcL), t5);
if (regOpcL != X86::MOV32rr)
MIB.addReg(t1);
(*MIB).addOperand(*argOpers[valArgIndx]);
assert(argOpers[valArgIndx + 1]->isReg() ==
argOpers[valArgIndx]->isReg());
assert(argOpers[valArgIndx + 1]->isImm() ==
argOpers[valArgIndx]->isImm());
if (argOpers[valArgIndx + 1]->isReg())
MIB = BuildMI(newMBB, dl, TII->get(regOpcH), t6);
else
MIB = BuildMI(newMBB, dl, TII->get(immOpcH), t6);
if (regOpcH != X86::MOV32rr)
MIB.addReg(t2);
(*MIB).addOperand(*argOpers[valArgIndx + 1]);
unsigned t7, t8;
if (Invert) {
t7 = F->getRegInfo().createVirtualRegister(RC);
t8 = F->getRegInfo().createVirtualRegister(RC);
MIB = BuildMI(newMBB, dl, TII->get(NotOpc), t7).addReg(t5);
MIB = BuildMI(newMBB, dl, TII->get(NotOpc), t8).addReg(t6);
} else {
t7 = t5;
t8 = t6;
}
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), X86::EAX);
MIB.addReg(t1);
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), X86::EDX);
MIB.addReg(t2);
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), X86::EBX);
MIB.addReg(t7);
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), X86::ECX);
MIB.addReg(t8);
MIB = BuildMI(newMBB, dl, TII->get(X86::LCMPXCHG8B));
for (int i=0; i <= lastAddrIndx; ++i)
(*MIB).addOperand(*argOpers[i]);
assert(bInstr->hasOneMemOperand() && "Unexpected number of memoperand");
(*MIB).setMemRefs(bInstr->memoperands_begin(),
bInstr->memoperands_end());
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), t3);
MIB.addReg(X86::EAX);
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), t4);
MIB.addReg(X86::EDX);
// insert branch
BuildMI(newMBB, dl, TII->get(X86::JNE_4)).addMBB(newMBB);
bInstr->eraseFromParent(); // The pseudo instruction is gone now.
return nextMBB;
}
// private utility function
MachineBasicBlock *
X86TargetLowering::EmitAtomicMinMaxWithCustomInserter(MachineInstr *mInstr,
MachineBasicBlock *MBB,
unsigned cmovOpc) const {
// For the atomic min/max operator, we generate
// thisMBB:
// newMBB:
// ld t1 = [min/max.addr]
// mov t2 = [min/max.val]
// cmp t1, t2
// cmov[cond] t2 = t1
// mov EAX = t1
// lcs dest = [bitinstr.addr], t2 [EAX is implicit]
// bz newMBB
// fallthrough -->nextMBB
//
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
const BasicBlock *LLVM_BB = MBB->getBasicBlock();
MachineFunction::iterator MBBIter = MBB;
++MBBIter;
/// First build the CFG
MachineFunction *F = MBB->getParent();
MachineBasicBlock *thisMBB = MBB;
MachineBasicBlock *newMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *nextMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(MBBIter, newMBB);
F->insert(MBBIter, nextMBB);
// Transfer the remainder of thisMBB and its successor edges to nextMBB.
nextMBB->splice(nextMBB->begin(), thisMBB,
llvm::next(MachineBasicBlock::iterator(mInstr)),
thisMBB->end());
nextMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
// Update thisMBB to fall through to newMBB
thisMBB->addSuccessor(newMBB);
// newMBB jumps to newMBB and fall through to nextMBB
newMBB->addSuccessor(nextMBB);
newMBB->addSuccessor(newMBB);
DebugLoc dl = mInstr->getDebugLoc();
// Insert instructions into newMBB based on incoming instruction
assert(mInstr->getNumOperands() < X86::AddrNumOperands + 4 &&
"unexpected number of operands");
MachineOperand& destOper = mInstr->getOperand(0);
MachineOperand* argOpers[2 + X86::AddrNumOperands];
int numArgs = mInstr->getNumOperands() - 1;
for (int i=0; i < numArgs; ++i)
argOpers[i] = &mInstr->getOperand(i+1);
// x86 address has 4 operands: base, index, scale, and displacement
int lastAddrIndx = X86::AddrNumOperands - 1; // [0,3]
int valArgIndx = lastAddrIndx + 1;
unsigned t1 = F->getRegInfo().createVirtualRegister(&X86::GR32RegClass);
MachineInstrBuilder MIB = BuildMI(newMBB, dl, TII->get(X86::MOV32rm), t1);
for (int i=0; i <= lastAddrIndx; ++i)
(*MIB).addOperand(*argOpers[i]);
// We only support register and immediate values
assert((argOpers[valArgIndx]->isReg() ||
argOpers[valArgIndx]->isImm()) &&
"invalid operand");
unsigned t2 = F->getRegInfo().createVirtualRegister(&X86::GR32RegClass);
if (argOpers[valArgIndx]->isReg())
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), t2);
else
MIB = BuildMI(newMBB, dl, TII->get(X86::MOV32rr), t2);
(*MIB).addOperand(*argOpers[valArgIndx]);
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), X86::EAX);
MIB.addReg(t1);
MIB = BuildMI(newMBB, dl, TII->get(X86::CMP32rr));
MIB.addReg(t1);
MIB.addReg(t2);
// Generate movc
unsigned t3 = F->getRegInfo().createVirtualRegister(&X86::GR32RegClass);
MIB = BuildMI(newMBB, dl, TII->get(cmovOpc),t3);
MIB.addReg(t2);
MIB.addReg(t1);
// Cmp and exchange if none has modified the memory location
MIB = BuildMI(newMBB, dl, TII->get(X86::LCMPXCHG32));
for (int i=0; i <= lastAddrIndx; ++i)
(*MIB).addOperand(*argOpers[i]);
MIB.addReg(t3);
assert(mInstr->hasOneMemOperand() && "Unexpected number of memoperand");
(*MIB).setMemRefs(mInstr->memoperands_begin(),
mInstr->memoperands_end());
MIB = BuildMI(newMBB, dl, TII->get(TargetOpcode::COPY), destOper.getReg());
MIB.addReg(X86::EAX);
// insert branch
BuildMI(newMBB, dl, TII->get(X86::JNE_4)).addMBB(newMBB);
mInstr->eraseFromParent(); // The pseudo instruction is gone now.
return nextMBB;
}
// FIXME: When we get size specific XMM0 registers, i.e. XMM0_V16I8
// or XMM0_V32I8 in AVX all of this code can be replaced with that
// in the .td file.
MachineBasicBlock *
X86TargetLowering::EmitPCMP(MachineInstr *MI, MachineBasicBlock *BB,
unsigned numArgs, bool memArg) const {
assert(Subtarget->hasSSE42() &&
"Target must have SSE4.2 or AVX features enabled");
DebugLoc dl = MI->getDebugLoc();
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
unsigned Opc;
if (!Subtarget->hasAVX()) {
if (memArg)
Opc = numArgs == 3 ? X86::PCMPISTRM128rm : X86::PCMPESTRM128rm;
else
Opc = numArgs == 3 ? X86::PCMPISTRM128rr : X86::PCMPESTRM128rr;
} else {
if (memArg)
Opc = numArgs == 3 ? X86::VPCMPISTRM128rm : X86::VPCMPESTRM128rm;
else
Opc = numArgs == 3 ? X86::VPCMPISTRM128rr : X86::VPCMPESTRM128rr;
}
MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(Opc));
for (unsigned i = 0; i < numArgs; ++i) {
MachineOperand &Op = MI->getOperand(i+1);
if (!(Op.isReg() && Op.isImplicit()))
MIB.addOperand(Op);
}
BuildMI(*BB, MI, dl,
TII->get(Subtarget->hasAVX() ? X86::VMOVAPSrr : X86::MOVAPSrr),
MI->getOperand(0).getReg())
.addReg(X86::XMM0);
MI->eraseFromParent();
return BB;
}
MachineBasicBlock *
X86TargetLowering::EmitMonitor(MachineInstr *MI, MachineBasicBlock *BB) const {
DebugLoc dl = MI->getDebugLoc();
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
// Address into RAX/EAX, other two args into ECX, EDX.
unsigned MemOpc = Subtarget->is64Bit() ? X86::LEA64r : X86::LEA32r;
unsigned MemReg = Subtarget->is64Bit() ? X86::RAX : X86::EAX;
MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(MemOpc), MemReg);
for (int i = 0; i < X86::AddrNumOperands; ++i)
MIB.addOperand(MI->getOperand(i));
unsigned ValOps = X86::AddrNumOperands;
BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), X86::ECX)
.addReg(MI->getOperand(ValOps).getReg());
BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), X86::EDX)
.addReg(MI->getOperand(ValOps+1).getReg());
// The instruction doesn't actually take any operands though.
BuildMI(*BB, MI, dl, TII->get(X86::MONITORrrr));
MI->eraseFromParent(); // The pseudo is gone now.
return BB;
}
MachineBasicBlock *
X86TargetLowering::EmitMwait(MachineInstr *MI, MachineBasicBlock *BB) const {
DebugLoc dl = MI->getDebugLoc();
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
// First arg in ECX, the second in EAX.
BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), X86::ECX)
.addReg(MI->getOperand(0).getReg());
BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), X86::EAX)
.addReg(MI->getOperand(1).getReg());
// The instruction doesn't actually take any operands though.
BuildMI(*BB, MI, dl, TII->get(X86::MWAITrr));
MI->eraseFromParent(); // The pseudo is gone now.
return BB;
}
MachineBasicBlock *
X86TargetLowering::EmitVAARG64WithCustomInserter(
MachineInstr *MI,
MachineBasicBlock *MBB) const {
// Emit va_arg instruction on X86-64.
// Operands to this pseudo-instruction:
// 0 ) Output : destination address (reg)
// 1-5) Input : va_list address (addr, i64mem)
// 6 ) ArgSize : Size (in bytes) of vararg type
// 7 ) ArgMode : 0=overflow only, 1=use gp_offset, 2=use fp_offset
// 8 ) Align : Alignment of type
// 9 ) EFLAGS (implicit-def)
assert(MI->getNumOperands() == 10 && "VAARG_64 should have 10 operands!");
assert(X86::AddrNumOperands == 5 && "VAARG_64 assumes 5 address operands");
unsigned DestReg = MI->getOperand(0).getReg();
MachineOperand &Base = MI->getOperand(1);
MachineOperand &Scale = MI->getOperand(2);
MachineOperand &Index = MI->getOperand(3);
MachineOperand &Disp = MI->getOperand(4);
MachineOperand &Segment = MI->getOperand(5);
unsigned ArgSize = MI->getOperand(6).getImm();
unsigned ArgMode = MI->getOperand(7).getImm();
unsigned Align = MI->getOperand(8).getImm();
// Memory Reference
assert(MI->hasOneMemOperand() && "Expected VAARG_64 to have one memoperand");
MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
// Machine Information
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
const TargetRegisterClass *AddrRegClass = getRegClassFor(MVT::i64);
const TargetRegisterClass *OffsetRegClass = getRegClassFor(MVT::i32);
DebugLoc DL = MI->getDebugLoc();
// struct va_list {
// i32 gp_offset
// i32 fp_offset
// i64 overflow_area (address)
// i64 reg_save_area (address)
// }
// sizeof(va_list) = 24
// alignment(va_list) = 8
unsigned TotalNumIntRegs = 6;
unsigned TotalNumXMMRegs = 8;
bool UseGPOffset = (ArgMode == 1);
bool UseFPOffset = (ArgMode == 2);
unsigned MaxOffset = TotalNumIntRegs * 8 +
(UseFPOffset ? TotalNumXMMRegs * 16 : 0);
/* Align ArgSize to a multiple of 8 */
unsigned ArgSizeA8 = (ArgSize + 7) & ~7;
bool NeedsAlign = (Align > 8);
MachineBasicBlock *thisMBB = MBB;
MachineBasicBlock *overflowMBB;
MachineBasicBlock *offsetMBB;
MachineBasicBlock *endMBB;
unsigned OffsetDestReg = 0; // Argument address computed by offsetMBB
unsigned OverflowDestReg = 0; // Argument address computed by overflowMBB
unsigned OffsetReg = 0;
if (!UseGPOffset && !UseFPOffset) {
// If we only pull from the overflow region, we don't create a branch.
// We don't need to alter control flow.
OffsetDestReg = 0; // unused
OverflowDestReg = DestReg;
offsetMBB = NULL;
overflowMBB = thisMBB;
endMBB = thisMBB;
} else {
// First emit code to check if gp_offset (or fp_offset) is below the bound.
// If so, pull the argument from reg_save_area. (branch to offsetMBB)
// If not, pull from overflow_area. (branch to overflowMBB)
//
// thisMBB
// | .
// | .
// offsetMBB overflowMBB
// | .
// | .
// endMBB
// Registers for the PHI in endMBB
OffsetDestReg = MRI.createVirtualRegister(AddrRegClass);
OverflowDestReg = MRI.createVirtualRegister(AddrRegClass);
const BasicBlock *LLVM_BB = MBB->getBasicBlock();
MachineFunction *MF = MBB->getParent();
overflowMBB = MF->CreateMachineBasicBlock(LLVM_BB);
offsetMBB = MF->CreateMachineBasicBlock(LLVM_BB);
endMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineFunction::iterator MBBIter = MBB;
++MBBIter;
// Insert the new basic blocks
MF->insert(MBBIter, offsetMBB);
MF->insert(MBBIter, overflowMBB);
MF->insert(MBBIter, endMBB);
// Transfer the remainder of MBB and its successor edges to endMBB.
endMBB->splice(endMBB->begin(), thisMBB,
llvm::next(MachineBasicBlock::iterator(MI)),
thisMBB->end());
endMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
// Make offsetMBB and overflowMBB successors of thisMBB
thisMBB->addSuccessor(offsetMBB);
thisMBB->addSuccessor(overflowMBB);
// endMBB is a successor of both offsetMBB and overflowMBB
offsetMBB->addSuccessor(endMBB);
overflowMBB->addSuccessor(endMBB);
// Load the offset value into a register
OffsetReg = MRI.createVirtualRegister(OffsetRegClass);
BuildMI(thisMBB, DL, TII->get(X86::MOV32rm), OffsetReg)
.addOperand(Base)
.addOperand(Scale)
.addOperand(Index)
.addDisp(Disp, UseFPOffset ? 4 : 0)
.addOperand(Segment)
.setMemRefs(MMOBegin, MMOEnd);
// Check if there is enough room left to pull this argument.
BuildMI(thisMBB, DL, TII->get(X86::CMP32ri))
.addReg(OffsetReg)
.addImm(MaxOffset + 8 - ArgSizeA8);
// Branch to "overflowMBB" if offset >= max
// Fall through to "offsetMBB" otherwise
BuildMI(thisMBB, DL, TII->get(X86::GetCondBranchFromCond(X86::COND_AE)))
.addMBB(overflowMBB);
}
// In offsetMBB, emit code to use the reg_save_area.
if (offsetMBB) {
assert(OffsetReg != 0);
// Read the reg_save_area address.
unsigned RegSaveReg = MRI.createVirtualRegister(AddrRegClass);
BuildMI(offsetMBB, DL, TII->get(X86::MOV64rm), RegSaveReg)
.addOperand(Base)
.addOperand(Scale)
.addOperand(Index)
.addDisp(Disp, 16)
.addOperand(Segment)
.setMemRefs(MMOBegin, MMOEnd);
// Zero-extend the offset
unsigned OffsetReg64 = MRI.createVirtualRegister(AddrRegClass);
BuildMI(offsetMBB, DL, TII->get(X86::SUBREG_TO_REG), OffsetReg64)
.addImm(0)
.addReg(OffsetReg)
.addImm(X86::sub_32bit);
// Add the offset to the reg_save_area to get the final address.
BuildMI(offsetMBB, DL, TII->get(X86::ADD64rr), OffsetDestReg)
.addReg(OffsetReg64)
.addReg(RegSaveReg);
// Compute the offset for the next argument
unsigned NextOffsetReg = MRI.createVirtualRegister(OffsetRegClass);
BuildMI(offsetMBB, DL, TII->get(X86::ADD32ri), NextOffsetReg)
.addReg(OffsetReg)
.addImm(UseFPOffset ? 16 : 8);
// Store it back into the va_list.
BuildMI(offsetMBB, DL, TII->get(X86::MOV32mr))
.addOperand(Base)
.addOperand(Scale)
.addOperand(Index)
.addDisp(Disp, UseFPOffset ? 4 : 0)
.addOperand(Segment)
.addReg(NextOffsetReg)
.setMemRefs(MMOBegin, MMOEnd);
// Jump to endMBB
BuildMI(offsetMBB, DL, TII->get(X86::JMP_4))
.addMBB(endMBB);
}
//
// Emit code to use overflow area
//
// Load the overflow_area address into a register.
unsigned OverflowAddrReg = MRI.createVirtualRegister(AddrRegClass);
BuildMI(overflowMBB, DL, TII->get(X86::MOV64rm), OverflowAddrReg)
.addOperand(Base)
.addOperand(Scale)
.addOperand(Index)
.addDisp(Disp, 8)
.addOperand(Segment)
.setMemRefs(MMOBegin, MMOEnd);
// If we need to align it, do so. Otherwise, just copy the address
// to OverflowDestReg.
if (NeedsAlign) {
// Align the overflow address
assert((Align & (Align-1)) == 0 && "Alignment must be a power of 2");
unsigned TmpReg = MRI.createVirtualRegister(AddrRegClass);
// aligned_addr = (addr + (align-1)) & ~(align-1)
BuildMI(overflowMBB, DL, TII->get(X86::ADD64ri32), TmpReg)
.addReg(OverflowAddrReg)
.addImm(Align-1);
BuildMI(overflowMBB, DL, TII->get(X86::AND64ri32), OverflowDestReg)
.addReg(TmpReg)
.addImm(~(uint64_t)(Align-1));
} else {
BuildMI(overflowMBB, DL, TII->get(TargetOpcode::COPY), OverflowDestReg)
.addReg(OverflowAddrReg);
}
// Compute the next overflow address after this argument.
// (the overflow address should be kept 8-byte aligned)
unsigned NextAddrReg = MRI.createVirtualRegister(AddrRegClass);
BuildMI(overflowMBB, DL, TII->get(X86::ADD64ri32), NextAddrReg)
.addReg(OverflowDestReg)
.addImm(ArgSizeA8);
// Store the new overflow address.
BuildMI(overflowMBB, DL, TII->get(X86::MOV64mr))
.addOperand(Base)
.addOperand(Scale)
.addOperand(Index)
.addDisp(Disp, 8)
.addOperand(Segment)
.addReg(NextAddrReg)
.setMemRefs(MMOBegin, MMOEnd);
// If we branched, emit the PHI to the front of endMBB.
if (offsetMBB) {
BuildMI(*endMBB, endMBB->begin(), DL,
TII->get(X86::PHI), DestReg)
.addReg(OffsetDestReg).addMBB(offsetMBB)
.addReg(OverflowDestReg).addMBB(overflowMBB);
}
// Erase the pseudo instruction
MI->eraseFromParent();
return endMBB;
}
MachineBasicBlock *
X86TargetLowering::EmitVAStartSaveXMMRegsWithCustomInserter(
MachineInstr *MI,
MachineBasicBlock *MBB) const {
// Emit code to save XMM registers to the stack. The ABI says that the
// number of registers to save is given in %al, so it's theoretically
// possible to do an indirect jump trick to avoid saving all of them,
// however this code takes a simpler approach and just executes all
// of the stores if %al is non-zero. It's less code, and it's probably
// easier on the hardware branch predictor, and stores aren't all that
// expensive anyway.
// Create the new basic blocks. One block contains all the XMM stores,
// and one block is the final destination regardless of whether any
// stores were performed.
const BasicBlock *LLVM_BB = MBB->getBasicBlock();
MachineFunction *F = MBB->getParent();
MachineFunction::iterator MBBIter = MBB;
++MBBIter;
MachineBasicBlock *XMMSaveMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *EndMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(MBBIter, XMMSaveMBB);
F->insert(MBBIter, EndMBB);
// Transfer the remainder of MBB and its successor edges to EndMBB.
EndMBB->splice(EndMBB->begin(), MBB,
llvm::next(MachineBasicBlock::iterator(MI)),
MBB->end());
EndMBB->transferSuccessorsAndUpdatePHIs(MBB);
// The original block will now fall through to the XMM save block.
MBB->addSuccessor(XMMSaveMBB);
// The XMMSaveMBB will fall through to the end block.
XMMSaveMBB->addSuccessor(EndMBB);
// Now add the instructions.
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
unsigned CountReg = MI->getOperand(0).getReg();
int64_t RegSaveFrameIndex = MI->getOperand(1).getImm();
int64_t VarArgsFPOffset = MI->getOperand(2).getImm();
if (!Subtarget->isTargetWin64()) {
// If %al is 0, branch around the XMM save block.
BuildMI(MBB, DL, TII->get(X86::TEST8rr)).addReg(CountReg).addReg(CountReg);
BuildMI(MBB, DL, TII->get(X86::JE_4)).addMBB(EndMBB);
MBB->addSuccessor(EndMBB);
}
unsigned MOVOpc = Subtarget->hasAVX() ? X86::VMOVAPSmr : X86::MOVAPSmr;
// In the XMM save block, save all the XMM argument registers.
for (int i = 3, e = MI->getNumOperands(); i != e; ++i) {
int64_t Offset = (i - 3) * 16 + VarArgsFPOffset;
MachineMemOperand *MMO =
F->getMachineMemOperand(
MachinePointerInfo::getFixedStack(RegSaveFrameIndex, Offset),
MachineMemOperand::MOStore,
/*Size=*/16, /*Align=*/16);
BuildMI(XMMSaveMBB, DL, TII->get(MOVOpc))
.addFrameIndex(RegSaveFrameIndex)
.addImm(/*Scale=*/1)
.addReg(/*IndexReg=*/0)
.addImm(/*Disp=*/Offset)
.addReg(/*Segment=*/0)
.addReg(MI->getOperand(i).getReg())
.addMemOperand(MMO);
}
MI->eraseFromParent(); // The pseudo instruction is gone now.
return EndMBB;
}
// The EFLAGS operand of SelectItr might be missing a kill marker
// because there were multiple uses of EFLAGS, and ISel didn't know
// which to mark. Figure out whether SelectItr should have had a
// kill marker, and set it if it should. Returns the correct kill
// marker value.
static bool checkAndUpdateEFLAGSKill(MachineBasicBlock::iterator SelectItr,
MachineBasicBlock* BB,
const TargetRegisterInfo* TRI) {
// Scan forward through BB for a use/def of EFLAGS.
MachineBasicBlock::iterator miI(llvm::next(SelectItr));
for (MachineBasicBlock::iterator miE = BB->end(); miI != miE; ++miI) {
const MachineInstr& mi = *miI;
if (mi.readsRegister(X86::EFLAGS))
return false;
if (mi.definesRegister(X86::EFLAGS))
break; // Should have kill-flag - update below.
}
// If we hit the end of the block, check whether EFLAGS is live into a
// successor.
if (miI == BB->end()) {
for (MachineBasicBlock::succ_iterator sItr = BB->succ_begin(),
sEnd = BB->succ_end();
sItr != sEnd; ++sItr) {
MachineBasicBlock* succ = *sItr;
if (succ->isLiveIn(X86::EFLAGS))
return false;
}
}
// We found a def, or hit the end of the basic block and EFLAGS wasn't live
// out. SelectMI should have a kill flag on EFLAGS.
SelectItr->addRegisterKilled(X86::EFLAGS, TRI);
return true;
}
MachineBasicBlock *
X86TargetLowering::EmitLoweredSelect(MachineInstr *MI,
MachineBasicBlock *BB) const {
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
// To "insert" a SELECT_CC instruction, we actually have to insert the
// diamond control-flow pattern. The incoming instruction knows the
// destination vreg to set, the condition code register to branch on, the
// true/false values to select between, and a branch opcode to use.
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineFunction::iterator It = BB;
++It;
// thisMBB:
// ...
// TrueVal = ...
// cmpTY ccX, r1, r2
// bCC copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *thisMBB = BB;
MachineFunction *F = BB->getParent();
MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(It, copy0MBB);
F->insert(It, sinkMBB);
// If the EFLAGS register isn't dead in the terminator, then claim that it's
// live into the sink and copy blocks.
const TargetRegisterInfo* TRI = getTargetMachine().getRegisterInfo();
if (!MI->killsRegister(X86::EFLAGS) &&
!checkAndUpdateEFLAGSKill(MI, BB, TRI)) {
copy0MBB->addLiveIn(X86::EFLAGS);
sinkMBB->addLiveIn(X86::EFLAGS);
}
// Transfer the remainder of BB and its successor edges to sinkMBB.
sinkMBB->splice(sinkMBB->begin(), BB,
llvm::next(MachineBasicBlock::iterator(MI)),
BB->end());
sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
// Add the true and fallthrough blocks as its successors.
BB->addSuccessor(copy0MBB);
BB->addSuccessor(sinkMBB);
// Create the conditional branch instruction.
unsigned Opc =
X86::GetCondBranchFromCond((X86::CondCode)MI->getOperand(3).getImm());
BuildMI(BB, DL, TII->get(Opc)).addMBB(sinkMBB);
// copy0MBB:
// %FalseValue = ...
// # fallthrough to sinkMBB
copy0MBB->addSuccessor(sinkMBB);
// sinkMBB:
// %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
// ...
BuildMI(*sinkMBB, sinkMBB->begin(), DL,
TII->get(X86::PHI), MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
.addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
MI->eraseFromParent(); // The pseudo instruction is gone now.
return sinkMBB;
}
MachineBasicBlock *
X86TargetLowering::EmitLoweredSegAlloca(MachineInstr *MI, MachineBasicBlock *BB,
bool Is64Bit) const {
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
MachineFunction *MF = BB->getParent();
const BasicBlock *LLVM_BB = BB->getBasicBlock();
assert(getTargetMachine().Options.EnableSegmentedStacks);
unsigned TlsReg = Is64Bit ? X86::FS : X86::GS;
unsigned TlsOffset = Is64Bit ? 0x70 : 0x30;
// BB:
// ... [Till the alloca]
// If stacklet is not large enough, jump to mallocMBB
//
// bumpMBB:
// Allocate by subtracting from RSP
// Jump to continueMBB
//
// mallocMBB:
// Allocate by call to runtime
//
// continueMBB:
// ...
// [rest of original BB]
//
MachineBasicBlock *mallocMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *bumpMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *continueMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineRegisterInfo &MRI = MF->getRegInfo();
const TargetRegisterClass *AddrRegClass =
getRegClassFor(Is64Bit ? MVT::i64:MVT::i32);
unsigned mallocPtrVReg = MRI.createVirtualRegister(AddrRegClass),
bumpSPPtrVReg = MRI.createVirtualRegister(AddrRegClass),
tmpSPVReg = MRI.createVirtualRegister(AddrRegClass),
SPLimitVReg = MRI.createVirtualRegister(AddrRegClass),
sizeVReg = MI->getOperand(1).getReg(),
physSPReg = Is64Bit ? X86::RSP : X86::ESP;
MachineFunction::iterator MBBIter = BB;
++MBBIter;
MF->insert(MBBIter, bumpMBB);
MF->insert(MBBIter, mallocMBB);
MF->insert(MBBIter, continueMBB);
continueMBB->splice(continueMBB->begin(), BB, llvm::next
(MachineBasicBlock::iterator(MI)), BB->end());
continueMBB->transferSuccessorsAndUpdatePHIs(BB);
// Add code to the main basic block to check if the stack limit has been hit,
// and if so, jump to mallocMBB otherwise to bumpMBB.
BuildMI(BB, DL, TII->get(TargetOpcode::COPY), tmpSPVReg).addReg(physSPReg);
BuildMI(BB, DL, TII->get(Is64Bit ? X86::SUB64rr:X86::SUB32rr), SPLimitVReg)
.addReg(tmpSPVReg).addReg(sizeVReg);
BuildMI(BB, DL, TII->get(Is64Bit ? X86::CMP64mr:X86::CMP32mr))
.addReg(0).addImm(1).addReg(0).addImm(TlsOffset).addReg(TlsReg)
.addReg(SPLimitVReg);
BuildMI(BB, DL, TII->get(X86::JG_4)).addMBB(mallocMBB);
// bumpMBB simply decreases the stack pointer, since we know the current
// stacklet has enough space.
BuildMI(bumpMBB, DL, TII->get(TargetOpcode::COPY), physSPReg)
.addReg(SPLimitVReg);
BuildMI(bumpMBB, DL, TII->get(TargetOpcode::COPY), bumpSPPtrVReg)
.addReg(SPLimitVReg);
BuildMI(bumpMBB, DL, TII->get(X86::JMP_4)).addMBB(continueMBB);
// Calls into a routine in libgcc to allocate more space from the heap.
const uint32_t *RegMask =
getTargetMachine().getRegisterInfo()->getCallPreservedMask(CallingConv::C);
if (Is64Bit) {
BuildMI(mallocMBB, DL, TII->get(X86::MOV64rr), X86::RDI)
.addReg(sizeVReg);
BuildMI(mallocMBB, DL, TII->get(X86::CALL64pcrel32))
.addExternalSymbol("__morestack_allocate_stack_space").addReg(X86::RDI)
.addRegMask(RegMask)
.addReg(X86::RAX, RegState::ImplicitDefine);
} else {
BuildMI(mallocMBB, DL, TII->get(X86::SUB32ri), physSPReg).addReg(physSPReg)
.addImm(12);
BuildMI(mallocMBB, DL, TII->get(X86::PUSH32r)).addReg(sizeVReg);
BuildMI(mallocMBB, DL, TII->get(X86::CALLpcrel32))
.addExternalSymbol("__morestack_allocate_stack_space")
.addRegMask(RegMask)
.addReg(X86::EAX, RegState::ImplicitDefine);
}
if (!Is64Bit)
BuildMI(mallocMBB, DL, TII->get(X86::ADD32ri), physSPReg).addReg(physSPReg)
.addImm(16);
BuildMI(mallocMBB, DL, TII->get(TargetOpcode::COPY), mallocPtrVReg)
.addReg(Is64Bit ? X86::RAX : X86::EAX);
BuildMI(mallocMBB, DL, TII->get(X86::JMP_4)).addMBB(continueMBB);
// Set up the CFG correctly.
BB->addSuccessor(bumpMBB);
BB->addSuccessor(mallocMBB);
mallocMBB->addSuccessor(continueMBB);
bumpMBB->addSuccessor(continueMBB);
// Take care of the PHI nodes.
BuildMI(*continueMBB, continueMBB->begin(), DL, TII->get(X86::PHI),
MI->getOperand(0).getReg())
.addReg(mallocPtrVReg).addMBB(mallocMBB)
.addReg(bumpSPPtrVReg).addMBB(bumpMBB);
// Delete the original pseudo instruction.
MI->eraseFromParent();
// And we're done.
return continueMBB;
}
MachineBasicBlock *
X86TargetLowering::EmitLoweredWinAlloca(MachineInstr *MI,
MachineBasicBlock *BB) const {
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
assert(!Subtarget->isTargetEnvMacho());
// The lowering is pretty easy: we're just emitting the call to _alloca. The
// non-trivial part is impdef of ESP.
if (Subtarget->isTargetWin64()) {
if (Subtarget->isTargetCygMing()) {
// ___chkstk(Mingw64):
// Clobbers R10, R11, RAX and EFLAGS.
// Updates RSP.
BuildMI(*BB, MI, DL, TII->get(X86::W64ALLOCA))
.addExternalSymbol("___chkstk")
.addReg(X86::RAX, RegState::Implicit)
.addReg(X86::RSP, RegState::Implicit)
.addReg(X86::RAX, RegState::Define | RegState::Implicit)
.addReg(X86::RSP, RegState::Define | RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);
} else {
// __chkstk(MSVCRT): does not update stack pointer.
// Clobbers R10, R11 and EFLAGS.
// FIXME: RAX(allocated size) might be reused and not killed.
BuildMI(*BB, MI, DL, TII->get(X86::W64ALLOCA))
.addExternalSymbol("__chkstk")
.addReg(X86::RAX, RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);
// RAX has the offset to subtracted from RSP.
BuildMI(*BB, MI, DL, TII->get(X86::SUB64rr), X86::RSP)
.addReg(X86::RSP)
.addReg(X86::RAX);
}
} else {
const char *StackProbeSymbol =
Subtarget->isTargetWindows() ? "_chkstk" : "_alloca";
BuildMI(*BB, MI, DL, TII->get(X86::CALLpcrel32))
.addExternalSymbol(StackProbeSymbol)
.addReg(X86::EAX, RegState::Implicit)
.addReg(X86::ESP, RegState::Implicit)
.addReg(X86::EAX, RegState::Define | RegState::Implicit)
.addReg(X86::ESP, RegState::Define | RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);
}
MI->eraseFromParent(); // The pseudo instruction is gone now.
return BB;
}
MachineBasicBlock *
X86TargetLowering::EmitLoweredTLSCall(MachineInstr *MI,
MachineBasicBlock *BB) const {
// This is pretty easy. We're taking the value that we received from
// our load from the relocation, sticking it in either RDI (x86-64)
// or EAX and doing an indirect call. The return value will then
// be in the normal return register.
const X86InstrInfo *TII
= static_cast<const X86InstrInfo*>(getTargetMachine().getInstrInfo());
DebugLoc DL = MI->getDebugLoc();
MachineFunction *F = BB->getParent();
assert(Subtarget->isTargetDarwin() && "Darwin only instr emitted?");
assert(MI->getOperand(3).isGlobal() && "This should be a global");
// Get a register mask for the lowered call.
// FIXME: The 32-bit calls have non-standard calling conventions. Use a
// proper register mask.
const uint32_t *RegMask =
getTargetMachine().getRegisterInfo()->getCallPreservedMask(CallingConv::C);
if (Subtarget->is64Bit()) {
MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
TII->get(X86::MOV64rm), X86::RDI)
.addReg(X86::RIP)
.addImm(0).addReg(0)
.addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
MI->getOperand(3).getTargetFlags())
.addReg(0);
MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL64m));
addDirectMem(MIB, X86::RDI);
MIB.addReg(X86::RAX, RegState::ImplicitDefine).addRegMask(RegMask);
} else if (getTargetMachine().getRelocationModel() != Reloc::PIC_) {
MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
TII->get(X86::MOV32rm), X86::EAX)
.addReg(0)
.addImm(0).addReg(0)
.addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
MI->getOperand(3).getTargetFlags())
.addReg(0);
MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL32m));
addDirectMem(MIB, X86::EAX);
MIB.addReg(X86::EAX, RegState::ImplicitDefine).addRegMask(RegMask);
} else {
MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
TII->get(X86::MOV32rm), X86::EAX)
.addReg(TII->getGlobalBaseReg(F))
.addImm(0).addReg(0)
.addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
MI->getOperand(3).getTargetFlags())
.addReg(0);
MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL32m));
addDirectMem(MIB, X86::EAX);
MIB.addReg(X86::EAX, RegState::ImplicitDefine).addRegMask(RegMask);
}
MI->eraseFromParent(); // The pseudo instruction is gone now.
return BB;
}
MachineBasicBlock *
X86TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) const {
switch (MI->getOpcode()) {
default: llvm_unreachable("Unexpected instr type to insert");
case X86::TAILJMPd64:
case X86::TAILJMPr64:
case X86::TAILJMPm64:
llvm_unreachable("TAILJMP64 would not be touched here.");
case X86::TCRETURNdi64:
case X86::TCRETURNri64:
case X86::TCRETURNmi64:
return BB;
case X86::WIN_ALLOCA:
return EmitLoweredWinAlloca(MI, BB);
case X86::SEG_ALLOCA_32:
return EmitLoweredSegAlloca(MI, BB, false);
case X86::SEG_ALLOCA_64:
return EmitLoweredSegAlloca(MI, BB, true);
case X86::TLSCall_32:
case X86::TLSCall_64:
return EmitLoweredTLSCall(MI, BB);
case X86::CMOV_GR8:
case X86::CMOV_FR32:
case X86::CMOV_FR64:
case X86::CMOV_V4F32:
case X86::CMOV_V2F64:
case X86::CMOV_V2I64:
case X86::CMOV_V8F32:
case X86::CMOV_V4F64:
case X86::CMOV_V4I64:
case X86::CMOV_GR16:
case X86::CMOV_GR32:
case X86::CMOV_RFP32:
case X86::CMOV_RFP64:
case X86::CMOV_RFP80:
return EmitLoweredSelect(MI, BB);
case X86::FP32_TO_INT16_IN_MEM:
case X86::FP32_TO_INT32_IN_MEM:
case X86::FP32_TO_INT64_IN_MEM:
case X86::FP64_TO_INT16_IN_MEM:
case X86::FP64_TO_INT32_IN_MEM:
case X86::FP64_TO_INT64_IN_MEM:
case X86::FP80_TO_INT16_IN_MEM:
case X86::FP80_TO_INT32_IN_MEM:
case X86::FP80_TO_INT64_IN_MEM: {
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
// Change the floating point control register to use "round towards zero"
// mode when truncating to an integer value.
MachineFunction *F = BB->getParent();
int CWFrameIdx = F->getFrameInfo()->CreateStackObject(2, 2, false);
addFrameReference(BuildMI(*BB, MI, DL,
TII->get(X86::FNSTCW16m)), CWFrameIdx);
// Load the old value of the high byte of the control word...
unsigned OldCW =
F->getRegInfo().createVirtualRegister(&X86::GR16RegClass);
addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16rm), OldCW),
CWFrameIdx);
// Set the high part to be round to zero...
addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16mi)), CWFrameIdx)
.addImm(0xC7F);
// Reload the modified control word now...
addFrameReference(BuildMI(*BB, MI, DL,
TII->get(X86::FLDCW16m)), CWFrameIdx);
// Restore the memory image of control word to original value
addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16mr)), CWFrameIdx)
.addReg(OldCW);
// Get the X86 opcode to use.
unsigned Opc;
switch (MI->getOpcode()) {
default: llvm_unreachable("illegal opcode!");
case X86::FP32_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m32; break;
case X86::FP32_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m32; break;
case X86::FP32_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m32; break;
case X86::FP64_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m64; break;
case X86::FP64_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m64; break;
case X86::FP64_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m64; break;
case X86::FP80_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m80; break;
case X86::FP80_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m80; break;
case X86::FP80_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m80; break;
}
X86AddressMode AM;
MachineOperand &Op = MI->getOperand(0);
if (Op.isReg()) {
AM.BaseType = X86AddressMode::RegBase;
AM.Base.Reg = Op.getReg();
} else {
AM.BaseType = X86AddressMode::FrameIndexBase;
AM.Base.FrameIndex = Op.getIndex();
}
Op = MI->getOperand(1);
if (Op.isImm())
AM.Scale = Op.getImm();
Op = MI->getOperand(2);
if (Op.isImm())
AM.IndexReg = Op.getImm();
Op = MI->getOperand(3);
if (Op.isGlobal()) {
AM.GV = Op.getGlobal();
} else {
AM.Disp = Op.getImm();
}
addFullAddress(BuildMI(*BB, MI, DL, TII->get(Opc)), AM)
.addReg(MI->getOperand(X86::AddrNumOperands).getReg());
// Reload the original control word now.
addFrameReference(BuildMI(*BB, MI, DL,
TII->get(X86::FLDCW16m)), CWFrameIdx);
MI->eraseFromParent(); // The pseudo instruction is gone now.
return BB;
}
// String/text processing lowering.
case X86::PCMPISTRM128REG:
case X86::VPCMPISTRM128REG:
return EmitPCMP(MI, BB, 3, false /* in-mem */);
case X86::PCMPISTRM128MEM:
case X86::VPCMPISTRM128MEM:
return EmitPCMP(MI, BB, 3, true /* in-mem */);
case X86::PCMPESTRM128REG:
case X86::VPCMPESTRM128REG:
return EmitPCMP(MI, BB, 5, false /* in mem */);
case X86::PCMPESTRM128MEM:
case X86::VPCMPESTRM128MEM:
return EmitPCMP(MI, BB, 5, true /* in mem */);
// Thread synchronization.
case X86::MONITOR:
return EmitMonitor(MI, BB);
case X86::MWAIT:
return EmitMwait(MI, BB);
// Atomic Lowering.
case X86::ATOMAND32:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::AND32rr,
X86::AND32ri, X86::MOV32rm,
X86::LCMPXCHG32,
X86::NOT32r, X86::EAX,
&X86::GR32RegClass);
case X86::ATOMOR32:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::OR32rr,
X86::OR32ri, X86::MOV32rm,
X86::LCMPXCHG32,
X86::NOT32r, X86::EAX,
&X86::GR32RegClass);
case X86::ATOMXOR32:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::XOR32rr,
X86::XOR32ri, X86::MOV32rm,
X86::LCMPXCHG32,
X86::NOT32r, X86::EAX,
&X86::GR32RegClass);
case X86::ATOMNAND32:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::AND32rr,
X86::AND32ri, X86::MOV32rm,
X86::LCMPXCHG32,
X86::NOT32r, X86::EAX,
&X86::GR32RegClass, true);
case X86::ATOMMIN32:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVL32rr);
case X86::ATOMMAX32:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVG32rr);
case X86::ATOMUMIN32:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVB32rr);
case X86::ATOMUMAX32:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVA32rr);
case X86::ATOMAND16:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::AND16rr,
X86::AND16ri, X86::MOV16rm,
X86::LCMPXCHG16,
X86::NOT16r, X86::AX,
&X86::GR16RegClass);
case X86::ATOMOR16:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::OR16rr,
X86::OR16ri, X86::MOV16rm,
X86::LCMPXCHG16,
X86::NOT16r, X86::AX,
&X86::GR16RegClass);
case X86::ATOMXOR16:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::XOR16rr,
X86::XOR16ri, X86::MOV16rm,
X86::LCMPXCHG16,
X86::NOT16r, X86::AX,
&X86::GR16RegClass);
case X86::ATOMNAND16:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::AND16rr,
X86::AND16ri, X86::MOV16rm,
X86::LCMPXCHG16,
X86::NOT16r, X86::AX,
&X86::GR16RegClass, true);
case X86::ATOMMIN16:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVL16rr);
case X86::ATOMMAX16:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVG16rr);
case X86::ATOMUMIN16:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVB16rr);
case X86::ATOMUMAX16:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVA16rr);
case X86::ATOMAND8:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::AND8rr,
X86::AND8ri, X86::MOV8rm,
X86::LCMPXCHG8,
X86::NOT8r, X86::AL,
&X86::GR8RegClass);
case X86::ATOMOR8:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::OR8rr,
X86::OR8ri, X86::MOV8rm,
X86::LCMPXCHG8,
X86::NOT8r, X86::AL,
&X86::GR8RegClass);
case X86::ATOMXOR8:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::XOR8rr,
X86::XOR8ri, X86::MOV8rm,
X86::LCMPXCHG8,
X86::NOT8r, X86::AL,
&X86::GR8RegClass);
case X86::ATOMNAND8:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::AND8rr,
X86::AND8ri, X86::MOV8rm,
X86::LCMPXCHG8,
X86::NOT8r, X86::AL,
&X86::GR8RegClass, true);
// FIXME: There are no CMOV8 instructions; MIN/MAX need some other way.
// This group is for 64-bit host.
case X86::ATOMAND64:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::AND64rr,
X86::AND64ri32, X86::MOV64rm,
X86::LCMPXCHG64,
X86::NOT64r, X86::RAX,
&X86::GR64RegClass);
case X86::ATOMOR64:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::OR64rr,
X86::OR64ri32, X86::MOV64rm,
X86::LCMPXCHG64,
X86::NOT64r, X86::RAX,
&X86::GR64RegClass);
case X86::ATOMXOR64:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::XOR64rr,
X86::XOR64ri32, X86::MOV64rm,
X86::LCMPXCHG64,
X86::NOT64r, X86::RAX,
&X86::GR64RegClass);
case X86::ATOMNAND64:
return EmitAtomicBitwiseWithCustomInserter(MI, BB, X86::AND64rr,
X86::AND64ri32, X86::MOV64rm,
X86::LCMPXCHG64,
X86::NOT64r, X86::RAX,
&X86::GR64RegClass, true);
case X86::ATOMMIN64:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVL64rr);
case X86::ATOMMAX64:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVG64rr);
case X86::ATOMUMIN64:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVB64rr);
case X86::ATOMUMAX64:
return EmitAtomicMinMaxWithCustomInserter(MI, BB, X86::CMOVA64rr);
// This group does 64-bit operations on a 32-bit host.
case X86::ATOMAND6432:
return EmitAtomicBit6432WithCustomInserter(MI, BB,
X86::AND32rr, X86::AND32rr,
X86::AND32ri, X86::AND32ri,
false);
case X86::ATOMOR6432:
return EmitAtomicBit6432WithCustomInserter(MI, BB,
X86::OR32rr, X86::OR32rr,
X86::OR32ri, X86::OR32ri,
false);
case X86::ATOMXOR6432:
return EmitAtomicBit6432WithCustomInserter(MI, BB,
X86::XOR32rr, X86::XOR32rr,
X86::XOR32ri, X86::XOR32ri,
false);
case X86::ATOMNAND6432:
return EmitAtomicBit6432WithCustomInserter(MI, BB,
X86::AND32rr, X86::AND32rr,
X86::AND32ri, X86::AND32ri,
true);
case X86::ATOMADD6432:
return EmitAtomicBit6432WithCustomInserter(MI, BB,
X86::ADD32rr, X86::ADC32rr,
X86::ADD32ri, X86::ADC32ri,
false);
case X86::ATOMSUB6432:
return EmitAtomicBit6432WithCustomInserter(MI, BB,
X86::SUB32rr, X86::SBB32rr,
X86::SUB32ri, X86::SBB32ri,
false);
case X86::ATOMSWAP6432:
return EmitAtomicBit6432WithCustomInserter(MI, BB,
X86::MOV32rr, X86::MOV32rr,
X86::MOV32ri, X86::MOV32ri,
false);
case X86::VASTART_SAVE_XMM_REGS:
return EmitVAStartSaveXMMRegsWithCustomInserter(MI, BB);
case X86::VAARG_64:
return EmitVAARG64WithCustomInserter(MI, BB);
}
}
//===----------------------------------------------------------------------===//
// X86 Optimization Hooks
//===----------------------------------------------------------------------===//
void X86TargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
APInt &KnownZero,
APInt &KnownOne,
const SelectionDAG &DAG,
unsigned Depth) const {
unsigned BitWidth = KnownZero.getBitWidth();
unsigned Opc = Op.getOpcode();
assert((Opc >= ISD::BUILTIN_OP_END ||
Opc == ISD::INTRINSIC_WO_CHAIN ||
Opc == ISD::INTRINSIC_W_CHAIN ||
Opc == ISD::INTRINSIC_VOID) &&
"Should use MaskedValueIsZero if you don't know whether Op"
" is a target node!");
KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
switch (Opc) {
default: break;
case X86ISD::ADD:
case X86ISD::SUB:
case X86ISD::ADC:
case X86ISD::SBB:
case X86ISD::SMUL:
case X86ISD::UMUL:
case X86ISD::INC:
case X86ISD::DEC:
case X86ISD::OR:
case X86ISD::XOR:
case X86ISD::AND:
// These nodes' second result is a boolean.
if (Op.getResNo() == 0)
break;
// Fallthrough
case X86ISD::SETCC:
KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
break;
case ISD::INTRINSIC_WO_CHAIN: {
unsigned IntId = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
unsigned NumLoBits = 0;
switch (IntId) {
default: break;
case Intrinsic::x86_sse_movmsk_ps:
case Intrinsic::x86_avx_movmsk_ps_256:
case Intrinsic::x86_sse2_movmsk_pd:
case Intrinsic::x86_avx_movmsk_pd_256:
case Intrinsic::x86_mmx_pmovmskb:
case Intrinsic::x86_sse2_pmovmskb_128:
case Intrinsic::x86_avx2_pmovmskb: {
// High bits of movmskp{s|d}, pmovmskb are known zero.
switch (IntId) {
default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
case Intrinsic::x86_sse_movmsk_ps: NumLoBits = 4; break;
case Intrinsic::x86_avx_movmsk_ps_256: NumLoBits = 8; break;
case Intrinsic::x86_sse2_movmsk_pd: NumLoBits = 2; break;
case Intrinsic::x86_avx_movmsk_pd_256: NumLoBits = 4; break;
case Intrinsic::x86_mmx_pmovmskb: NumLoBits = 8; break;
case Intrinsic::x86_sse2_pmovmskb_128: NumLoBits = 16; break;
case Intrinsic::x86_avx2_pmovmskb: NumLoBits = 32; break;
}
KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - NumLoBits);
break;
}
}
break;
}
}
}
unsigned X86TargetLowering::ComputeNumSignBitsForTargetNode(SDValue Op,
unsigned Depth) const {
// SETCC_CARRY sets the dest to ~0 for true or 0 for false.
if (Op.getOpcode() == X86ISD::SETCC_CARRY)
return Op.getValueType().getScalarType().getSizeInBits();
// Fallback case.
return 1;
}
/// isGAPlusOffset - Returns true (and the GlobalValue and the offset) if the
/// node is a GlobalAddress + offset.
bool X86TargetLowering::isGAPlusOffset(SDNode *N,
const GlobalValue* &GA,
int64_t &Offset) const {
if (N->getOpcode() == X86ISD::Wrapper) {
if (isa<GlobalAddressSDNode>(N->getOperand(0))) {
GA = cast<GlobalAddressSDNode>(N->getOperand(0))->getGlobal();
Offset = cast<GlobalAddressSDNode>(N->getOperand(0))->getOffset();
return true;
}
}
return TargetLowering::isGAPlusOffset(N, GA, Offset);
}
/// isShuffleHigh128VectorInsertLow - Checks whether the shuffle node is the
/// same as extracting the high 128-bit part of 256-bit vector and then
/// inserting the result into the low part of a new 256-bit vector
static bool isShuffleHigh128VectorInsertLow(ShuffleVectorSDNode *SVOp) {
EVT VT = SVOp->getValueType(0);
unsigned NumElems = VT.getVectorNumElements();
// vector_shuffle <4, 5, 6, 7, u, u, u, u> or <2, 3, u, u>
for (unsigned i = 0, j = NumElems/2; i != NumElems/2; ++i, ++j)
if (!isUndefOrEqual(SVOp->getMaskElt(i), j) ||
SVOp->getMaskElt(j) >= 0)
return false;
return true;
}
/// isShuffleLow128VectorInsertHigh - Checks whether the shuffle node is the
/// same as extracting the low 128-bit part of 256-bit vector and then
/// inserting the result into the high part of a new 256-bit vector
static bool isShuffleLow128VectorInsertHigh(ShuffleVectorSDNode *SVOp) {
EVT VT = SVOp->getValueType(0);
unsigned NumElems = VT.getVectorNumElements();
// vector_shuffle <u, u, u, u, 0, 1, 2, 3> or <u, u, 0, 1>
for (unsigned i = NumElems/2, j = 0; i != NumElems; ++i, ++j)
if (!isUndefOrEqual(SVOp->getMaskElt(i), j) ||
SVOp->getMaskElt(j) >= 0)
return false;
return true;
}
/// PerformShuffleCombine256 - Performs shuffle combines for 256-bit vectors.
static SDValue PerformShuffleCombine256(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget* Subtarget) {
DebugLoc dl = N->getDebugLoc();
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
SDValue V1 = SVOp->getOperand(0);
SDValue V2 = SVOp->getOperand(1);
EVT VT = SVOp->getValueType(0);
unsigned NumElems = VT.getVectorNumElements();
if (V1.getOpcode() == ISD::CONCAT_VECTORS &&
V2.getOpcode() == ISD::CONCAT_VECTORS) {
//
// 0,0,0,...
// |
// V UNDEF BUILD_VECTOR UNDEF
// \ / \ /
// CONCAT_VECTOR CONCAT_VECTOR
// \ /
// \ /
// RESULT: V + zero extended
//
if (V2.getOperand(0).getOpcode() != ISD::BUILD_VECTOR ||
V2.getOperand(1).getOpcode() != ISD::UNDEF ||
V1.getOperand(1).getOpcode() != ISD::UNDEF)
return SDValue();
if (!ISD::isBuildVectorAllZeros(V2.getOperand(0).getNode()))
return SDValue();
// To match the shuffle mask, the first half of the mask should
// be exactly the first vector, and all the rest a splat with the
// first element of the second one.
for (unsigned i = 0; i != NumElems/2; ++i)
if (!isUndefOrEqual(SVOp->getMaskElt(i), i) ||
!isUndefOrEqual(SVOp->getMaskElt(i+NumElems/2), NumElems))
return SDValue();
// If V1 is coming from a vector load then just fold to a VZEXT_LOAD.
if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(V1.getOperand(0))) {
SDVTList Tys = DAG.getVTList(MVT::v4i64, MVT::Other);
SDValue Ops[] = { Ld->getChain(), Ld->getBasePtr() };
SDValue ResNode =
DAG.getMemIntrinsicNode(X86ISD::VZEXT_LOAD, dl, Tys, Ops, 2,
Ld->getMemoryVT(),
Ld->getPointerInfo(),
Ld->getAlignment(),
false/*isVolatile*/, true/*ReadMem*/,
false/*WriteMem*/);
return DAG.getNode(ISD::BITCAST, dl, VT, ResNode);
}
// Emit a zeroed vector and insert the desired subvector on its
// first half.
SDValue Zeros = getZeroVector(VT, Subtarget, DAG, dl);
SDValue InsV = Insert128BitVector(Zeros, V1.getOperand(0), 0, DAG, dl);
return DCI.CombineTo(N, InsV);
}
//===--------------------------------------------------------------------===//
// Combine some shuffles into subvector extracts and inserts:
//
// vector_shuffle <4, 5, 6, 7, u, u, u, u> or <2, 3, u, u>
if (isShuffleHigh128VectorInsertLow(SVOp)) {
SDValue V = Extract128BitVector(V1, NumElems/2, DAG, dl);
SDValue InsV = Insert128BitVector(DAG.getUNDEF(VT), V, 0, DAG, dl);
return DCI.CombineTo(N, InsV);
}
// vector_shuffle <u, u, u, u, 0, 1, 2, 3> or <u, u, 0, 1>
if (isShuffleLow128VectorInsertHigh(SVOp)) {
SDValue V = Extract128BitVector(V1, 0, DAG, dl);
SDValue InsV = Insert128BitVector(DAG.getUNDEF(VT), V, NumElems/2, DAG, dl);
return DCI.CombineTo(N, InsV);
}
return SDValue();
}
/// PerformShuffleCombine - Performs several different shuffle combines.
static SDValue PerformShuffleCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
DebugLoc dl = N->getDebugLoc();
EVT VT = N->getValueType(0);
// Don't create instructions with illegal types after legalize types has run.
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
if (!DCI.isBeforeLegalize() && !TLI.isTypeLegal(VT.getVectorElementType()))
return SDValue();
// Combine 256-bit vector shuffles. This is only profitable when in AVX mode
if (Subtarget->hasAVX() && VT.getSizeInBits() == 256 &&
N->getOpcode() == ISD::VECTOR_SHUFFLE)
return PerformShuffleCombine256(N, DAG, DCI, Subtarget);
// Only handle 128 wide vector from here on.
if (VT.getSizeInBits() != 128)
return SDValue();
// Combine a vector_shuffle that is equal to build_vector load1, load2, load3,
// load4, <0, 1, 2, 3> into a 128-bit load if the load addresses are
// consecutive, non-overlapping, and in the right order.
SmallVector<SDValue, 16> Elts;
for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i)
Elts.push_back(getShuffleScalarElt(N, i, DAG, 0));
return EltsFromConsecutiveLoads(VT, Elts, dl, DAG);
}
/// DCI, PerformTruncateCombine - Converts truncate operation to
/// a sequence of vector shuffle operations.
/// It is possible when we truncate 256-bit vector to 128-bit vector
SDValue X86TargetLowering::PerformTruncateCombine(SDNode *N, SelectionDAG &DAG,
DAGCombinerInfo &DCI) const {
if (!DCI.isBeforeLegalizeOps())
return SDValue();
if (!Subtarget->hasAVX())
return SDValue();
EVT VT = N->getValueType(0);
SDValue Op = N->getOperand(0);
EVT OpVT = Op.getValueType();
DebugLoc dl = N->getDebugLoc();
if ((VT == MVT::v4i32) && (OpVT == MVT::v4i64)) {
if (Subtarget->hasAVX2()) {
// AVX2: v4i64 -> v4i32
// VPERMD
static const int ShufMask[] = {0, 2, 4, 6, -1, -1, -1, -1};
Op = DAG.getNode(ISD::BITCAST, dl, MVT::v8i32, Op);
Op = DAG.getVectorShuffle(MVT::v8i32, dl, Op, DAG.getUNDEF(MVT::v8i32),
ShufMask);
return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, Op,
DAG.getIntPtrConstant(0));
}
// AVX: v4i64 -> v4i32
SDValue OpLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v2i64, Op,
DAG.getIntPtrConstant(0));
SDValue OpHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v2i64, Op,
DAG.getIntPtrConstant(2));
OpLo = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, OpLo);
OpHi = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, OpHi);
// PSHUFD
static const int ShufMask1[] = {0, 2, 0, 0};
OpLo = DAG.getVectorShuffle(VT, dl, OpLo, DAG.getUNDEF(VT), ShufMask1);
OpHi = DAG.getVectorShuffle(VT, dl, OpHi, DAG.getUNDEF(VT), ShufMask1);
// MOVLHPS
static const int ShufMask2[] = {0, 1, 4, 5};
return DAG.getVectorShuffle(VT, dl, OpLo, OpHi, ShufMask2);
}
if ((VT == MVT::v8i16) && (OpVT == MVT::v8i32)) {
if (Subtarget->hasAVX2()) {
// AVX2: v8i32 -> v8i16
Op = DAG.getNode(ISD::BITCAST, dl, MVT::v32i8, Op);
// PSHUFB
SmallVector<SDValue,32> pshufbMask;
for (unsigned i = 0; i < 2; ++i) {
pshufbMask.push_back(DAG.getConstant(0x0, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0x1, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0x4, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0x5, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0x8, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0x9, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0xc, MVT::i8));
pshufbMask.push_back(DAG.getConstant(0xd, MVT::i8));
for (unsigned j = 0; j < 8; ++j)
pshufbMask.push_back(DAG.getConstant(0x80, MVT::i8));
}
SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v32i8,
&pshufbMask[0], 32);
Op = DAG.getNode(X86ISD::PSHUFB, dl, MVT::v32i8, Op, BV);
Op = DAG.getNode(ISD::BITCAST, dl, MVT::v4i64, Op);
static const int ShufMask[] = {0, 2, -1, -1};
Op = DAG.getVectorShuffle(MVT::v4i64, dl, Op, DAG.getUNDEF(MVT::v4i64),
&ShufMask[0]);
Op = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v2i64, Op,
DAG.getIntPtrConstant(0));
return DAG.getNode(ISD::BITCAST, dl, VT, Op);
}
SDValue OpLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i32, Op,
DAG.getIntPtrConstant(0));
SDValue OpHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MVT::v4i32, Op,
DAG.getIntPtrConstant(4));
OpLo = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpLo);
OpHi = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpHi);
// PSHUFB
static const int ShufMask1[] = {0, 1, 4, 5, 8, 9, 12, 13,
-1, -1, -1, -1, -1, -1, -1, -1};
OpLo = DAG.getVectorShuffle(MVT::v16i8, dl, OpLo, DAG.getUNDEF(MVT::v16i8),
ShufMask1);
OpHi = DAG.getVectorShuffle(MVT::v16i8, dl, OpHi, DAG.getUNDEF(MVT::v16i8),
ShufMask1);
OpLo = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, OpLo);
OpHi = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, OpHi);
// MOVLHPS
static const int ShufMask2[] = {0, 1, 4, 5};
SDValue res = DAG.getVectorShuffle(MVT::v4i32, dl, OpLo, OpHi, ShufMask2);
return DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, res);
}
return SDValue();
}
/// XFormVExtractWithShuffleIntoLoad - Check if a vector extract from a target
/// specific shuffle of a load can be folded into a single element load.
/// Similar handling for VECTOR_SHUFFLE is performed by DAGCombiner, but
/// shuffles have been customed lowered so we need to handle those here.
static SDValue XFormVExtractWithShuffleIntoLoad(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI) {
if (DCI.isBeforeLegalizeOps())
return SDValue();
SDValue InVec = N->getOperand(0);
SDValue EltNo = N->getOperand(1);
if (!isa<ConstantSDNode>(EltNo))
return SDValue();
EVT VT = InVec.getValueType();
bool HasShuffleIntoBitcast = false;
if (InVec.getOpcode() == ISD::BITCAST) {
// Don't duplicate a load with other uses.
if (!InVec.hasOneUse())
return SDValue();
EVT BCVT = InVec.getOperand(0).getValueType();
if (BCVT.getVectorNumElements() != VT.getVectorNumElements())
return SDValue();
InVec = InVec.getOperand(0);
HasShuffleIntoBitcast = true;
}
if (!isTargetShuffle(InVec.getOpcode()))
return SDValue();
// Don't duplicate a load with other uses.
if (!InVec.hasOneUse())
return SDValue();
SmallVector<int, 16> ShuffleMask;
bool UnaryShuffle;
if (!getTargetShuffleMask(InVec.getNode(), VT, ShuffleMask, UnaryShuffle))
return SDValue();
// Select the input vector, guarding against out of range extract vector.
unsigned NumElems = VT.getVectorNumElements();
int Elt = cast<ConstantSDNode>(EltNo)->getZExtValue();
int Idx = (Elt > (int)NumElems) ? -1 : ShuffleMask[Elt];
SDValue LdNode = (Idx < (int)NumElems) ? InVec.getOperand(0)
: InVec.getOperand(1);
// If inputs to shuffle are the same for both ops, then allow 2 uses
unsigned AllowedUses = InVec.getOperand(0) == InVec.getOperand(1) ? 2 : 1;
if (LdNode.getOpcode() == ISD::BITCAST) {
// Don't duplicate a load with other uses.
if (!LdNode.getNode()->hasNUsesOfValue(AllowedUses, 0))
return SDValue();
AllowedUses = 1; // only allow 1 load use if we have a bitcast
LdNode = LdNode.getOperand(0);
}
if (!ISD::isNormalLoad(LdNode.getNode()))
return SDValue();
LoadSDNode *LN0 = cast<LoadSDNode>(LdNode);
if (!LN0 ||!LN0->hasNUsesOfValue(AllowedUses, 0) || LN0->isVolatile())
return SDValue();
if (HasShuffleIntoBitcast) {
// If there's a bitcast before the shuffle, check if the load type and
// alignment is valid.
unsigned Align = LN0->getAlignment();
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
unsigned NewAlign = TLI.getTargetData()->
getABITypeAlignment(VT.getTypeForEVT(*DAG.getContext()));
if (NewAlign > Align || !TLI.isOperationLegalOrCustom(ISD::LOAD, VT))
return SDValue();
}
// All checks match so transform back to vector_shuffle so that DAG combiner
// can finish the job
DebugLoc dl = N->getDebugLoc();
// Create shuffle node taking into account the case that its a unary shuffle
SDValue Shuffle = (UnaryShuffle) ? DAG.getUNDEF(VT) : InVec.getOperand(1);
Shuffle = DAG.getVectorShuffle(InVec.getValueType(), dl,
InVec.getOperand(0), Shuffle,
&ShuffleMask[0]);
Shuffle = DAG.getNode(ISD::BITCAST, dl, VT, Shuffle);
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, N->getValueType(0), Shuffle,
EltNo);
}
/// PerformEXTRACT_VECTOR_ELTCombine - Detect vector gather/scatter index
/// generation and convert it from being a bunch of shuffles and extracts
/// to a simple store and scalar loads to extract the elements.
static SDValue PerformEXTRACT_VECTOR_ELTCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI) {
SDValue NewOp = XFormVExtractWithShuffleIntoLoad(N, DAG, DCI);
if (NewOp.getNode())
return NewOp;
SDValue InputVector = N->getOperand(0);
// Only operate on vectors of 4 elements, where the alternative shuffling
// gets to be more expensive.
if (InputVector.getValueType() != MVT::v4i32)
return SDValue();
// Check whether every use of InputVector is an EXTRACT_VECTOR_ELT with a
// single use which is a sign-extend or zero-extend, and all elements are
// used.
SmallVector<SDNode *, 4> Uses;
unsigned ExtractedElements = 0;
for (SDNode::use_iterator UI = InputVector.getNode()->use_begin(),
UE = InputVector.getNode()->use_end(); UI != UE; ++UI) {
if (UI.getUse().getResNo() != InputVector.getResNo())
return SDValue();
SDNode *Extract = *UI;
if (Extract->getOpcode() != ISD::EXTRACT_VECTOR_ELT)
return SDValue();
if (Extract->getValueType(0) != MVT::i32)
return SDValue();
if (!Extract->hasOneUse())
return SDValue();
if (Extract->use_begin()->getOpcode() != ISD::SIGN_EXTEND &&
Extract->use_begin()->getOpcode() != ISD::ZERO_EXTEND)
return SDValue();
if (!isa<ConstantSDNode>(Extract->getOperand(1)))
return SDValue();
// Record which element was extracted.
ExtractedElements |=
1 << cast<ConstantSDNode>(Extract->getOperand(1))->getZExtValue();
Uses.push_back(Extract);
}
// If not all the elements were used, this may not be worthwhile.
if (ExtractedElements != 15)
return SDValue();
// Ok, we've now decided to do the transformation.
DebugLoc dl = InputVector.getDebugLoc();
// Store the value to a temporary stack slot.
SDValue StackPtr = DAG.CreateStackTemporary(InputVector.getValueType());
SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, InputVector, StackPtr,
MachinePointerInfo(), false, false, 0);
// Replace each use (extract) with a load of the appropriate element.
for (SmallVectorImpl<SDNode *>::iterator UI = Uses.begin(),
UE = Uses.end(); UI != UE; ++UI) {
SDNode *Extract = *UI;
// cOMpute the element's address.
SDValue Idx = Extract->getOperand(1);
unsigned EltSize =
InputVector.getValueType().getVectorElementType().getSizeInBits()/8;
uint64_t Offset = EltSize * cast<ConstantSDNode>(Idx)->getZExtValue();
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
SDValue OffsetVal = DAG.getConstant(Offset, TLI.getPointerTy());
SDValue ScalarAddr = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(),
StackPtr, OffsetVal);
// Load the scalar.
SDValue LoadScalar = DAG.getLoad(Extract->getValueType(0), dl, Ch,
ScalarAddr, MachinePointerInfo(),
false, false, false, 0);
// Replace the exact with the load.
DAG.ReplaceAllUsesOfValueWith(SDValue(Extract, 0), LoadScalar);
}
// The replacement was made in place; don't return anything.
return SDValue();
}
/// PerformSELECTCombine - Do target-specific dag combines on SELECT and VSELECT
/// nodes.
static SDValue PerformSELECTCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
DebugLoc DL = N->getDebugLoc();
SDValue Cond = N->getOperand(0);
// Get the LHS/RHS of the select.
SDValue LHS = N->getOperand(1);
SDValue RHS = N->getOperand(2);
EVT VT = LHS.getValueType();
// If we have SSE[12] support, try to form min/max nodes. SSE min/max
// instructions match the semantics of the common C idiom x<y?x:y but not
// x<=y?x:y, because of how they handle negative zero (which can be
// ignored in unsafe-math mode).
if (Cond.getOpcode() == ISD::SETCC && VT.isFloatingPoint() &&
VT != MVT::f80 && DAG.getTargetLoweringInfo().isTypeLegal(VT) &&
(Subtarget->hasSSE2() ||
(Subtarget->hasSSE1() && VT.getScalarType() == MVT::f32))) {
ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
unsigned Opcode = 0;
// Check for x CC y ? x : y.
if (DAG.isEqualTo(LHS, Cond.getOperand(0)) &&
DAG.isEqualTo(RHS, Cond.getOperand(1))) {
switch (CC) {
default: break;
case ISD::SETULT:
// Converting this to a min would handle NaNs incorrectly, and swapping
// the operands would cause it to handle comparisons between positive
// and negative zero incorrectly.
if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)) {
if (!DAG.getTarget().Options.UnsafeFPMath &&
!(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
break;
std::swap(LHS, RHS);
}
Opcode = X86ISD::FMIN;
break;
case ISD::SETOLE:
// Converting this to a min would handle comparisons between positive
// and negative zero incorrectly.
if (!DAG.getTarget().Options.UnsafeFPMath &&
!DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS))
break;
Opcode = X86ISD::FMIN;
break;
case ISD::SETULE:
// Converting this to a min would handle both negative zeros and NaNs
// incorrectly, but we can swap the operands to fix both.
std::swap(LHS, RHS);
case ISD::SETOLT:
case ISD::SETLT:
case ISD::SETLE:
Opcode = X86ISD::FMIN;
break;
case ISD::SETOGE:
// Converting this to a max would handle comparisons between positive
// and negative zero incorrectly.
if (!DAG.getTarget().Options.UnsafeFPMath &&
!DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS))
break;
Opcode = X86ISD::FMAX;
break;
case ISD::SETUGT:
// Converting this to a max would handle NaNs incorrectly, and swapping
// the operands would cause it to handle comparisons between positive
// and negative zero incorrectly.
if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)) {
if (!DAG.getTarget().Options.UnsafeFPMath &&
!(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
break;
std::swap(LHS, RHS);
}
Opcode = X86ISD::FMAX;
break;
case ISD::SETUGE:
// Converting this to a max would handle both negative zeros and NaNs
// incorrectly, but we can swap the operands to fix both.
std::swap(LHS, RHS);
case ISD::SETOGT:
case ISD::SETGT:
case ISD::SETGE:
Opcode = X86ISD::FMAX;
break;
}
// Check for x CC y ? y : x -- a min/max with reversed arms.
} else if (DAG.isEqualTo(LHS, Cond.getOperand(1)) &&
DAG.isEqualTo(RHS, Cond.getOperand(0))) {
switch (CC) {
default: break;
case ISD::SETOGE:
// Converting this to a min would handle comparisons between positive
// and negative zero incorrectly, and swapping the operands would
// cause it to handle NaNs incorrectly.
if (!DAG.getTarget().Options.UnsafeFPMath &&
!(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS))) {
if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
break;
std::swap(LHS, RHS);
}
Opcode = X86ISD::FMIN;
break;
case ISD::SETUGT:
// Converting this to a min would handle NaNs incorrectly.
if (!DAG.getTarget().Options.UnsafeFPMath &&
(!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)))
break;
Opcode = X86ISD::FMIN;
break;
case ISD::SETUGE:
// Converting this to a min would handle both negative zeros and NaNs
// incorrectly, but we can swap the operands to fix both.
std::swap(LHS, RHS);
case ISD::SETOGT:
case ISD::SETGT:
case ISD::SETGE:
Opcode = X86ISD::FMIN;
break;
case ISD::SETULT:
// Converting this to a max would handle NaNs incorrectly.
if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
break;
Opcode = X86ISD::FMAX;
break;
case ISD::SETOLE:
// Converting this to a max would handle comparisons between positive
// and negative zero incorrectly, and swapping the operands would
// cause it to handle NaNs incorrectly.
if (!DAG.getTarget().Options.UnsafeFPMath &&
!DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS)) {
if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
break;
std::swap(LHS, RHS);
}
Opcode = X86ISD::FMAX;
break;
case ISD::SETULE:
// Converting this to a max would handle both negative zeros and NaNs
// incorrectly, but we can swap the operands to fix both.
std::swap(LHS, RHS);
case ISD::SETOLT:
case ISD::SETLT:
case ISD::SETLE:
Opcode = X86ISD::FMAX;
break;
}
}
if (Opcode)
return DAG.getNode(Opcode, DL, N->getValueType(0), LHS, RHS);
}
// If this is a select between two integer constants, try to do some
// optimizations.
if (ConstantSDNode *TrueC = dyn_cast<ConstantSDNode>(LHS)) {
if (ConstantSDNode *FalseC = dyn_cast<ConstantSDNode>(RHS))
// Don't do this for crazy integer types.
if (DAG.getTargetLoweringInfo().isTypeLegal(LHS.getValueType())) {
// If this is efficiently invertible, canonicalize the LHSC/RHSC values
// so that TrueC (the true value) is larger than FalseC.
bool NeedsCondInvert = false;
if (TrueC->getAPIntValue().ult(FalseC->getAPIntValue()) &&
// Efficiently invertible.
(Cond.getOpcode() == ISD::SETCC || // setcc -> invertible.
(Cond.getOpcode() == ISD::XOR && // xor(X, C) -> invertible.
isa<ConstantSDNode>(Cond.getOperand(1))))) {
NeedsCondInvert = true;
std::swap(TrueC, FalseC);
}
// Optimize C ? 8 : 0 -> zext(C) << 3. Likewise for any pow2/0.
if (FalseC->getAPIntValue() == 0 &&
TrueC->getAPIntValue().isPowerOf2()) {
if (NeedsCondInvert) // Invert the condition if needed.
Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
DAG.getConstant(1, Cond.getValueType()));
// Zero extend the condition if needed.
Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, LHS.getValueType(), Cond);
unsigned ShAmt = TrueC->getAPIntValue().logBase2();
return DAG.getNode(ISD::SHL, DL, LHS.getValueType(), Cond,
DAG.getConstant(ShAmt, MVT::i8));
}
// Optimize Cond ? cst+1 : cst -> zext(setcc(C)+cst.
if (FalseC->getAPIntValue()+1 == TrueC->getAPIntValue()) {
if (NeedsCondInvert) // Invert the condition if needed.
Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
DAG.getConstant(1, Cond.getValueType()));
// Zero extend the condition if needed.
Cond = DAG.getNode(ISD::ZERO_EXTEND, DL,
FalseC->getValueType(0), Cond);
return DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
SDValue(FalseC, 0));
}
// Optimize cases that will turn into an LEA instruction. This requires
// an i32 or i64 and an efficient multiplier (1, 2, 3, 4, 5, 8, 9).
if (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i64) {
uint64_t Diff = TrueC->getZExtValue()-FalseC->getZExtValue();
if (N->getValueType(0) == MVT::i32) Diff = (unsigned)Diff;
bool isFastMultiplier = false;
if (Diff < 10) {
switch ((unsigned char)Diff) {
default: break;
case 1: // result = add base, cond
case 2: // result = lea base( , cond*2)
case 3: // result = lea base(cond, cond*2)
case 4: // result = lea base( , cond*4)
case 5: // result = lea base(cond, cond*4)
case 8: // result = lea base( , cond*8)
case 9: // result = lea base(cond, cond*8)
isFastMultiplier = true;
break;
}
}
if (isFastMultiplier) {
APInt Diff = TrueC->getAPIntValue()-FalseC->getAPIntValue();
if (NeedsCondInvert) // Invert the condition if needed.
Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
DAG.getConstant(1, Cond.getValueType()));
// Zero extend the condition if needed.
Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, FalseC->getValueType(0),
Cond);
// Scale the condition by the difference.
if (Diff != 1)
Cond = DAG.getNode(ISD::MUL, DL, Cond.getValueType(), Cond,
DAG.getConstant(Diff, Cond.getValueType()));
// Add the base if non-zero.
if (FalseC->getAPIntValue() != 0)
Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
SDValue(FalseC, 0));
return Cond;
}
}
}
}
// Canonicalize max and min:
// (x > y) ? x : y -> (x >= y) ? x : y
// (x < y) ? x : y -> (x <= y) ? x : y
// This allows use of COND_S / COND_NS (see TranslateX86CC) which eliminates
// the need for an extra compare
// against zero. e.g.
// (x - y) > 0 : (x - y) ? 0 -> (x - y) >= 0 : (x - y) ? 0
// subl %esi, %edi
// testl %edi, %edi
// movl $0, %eax
// cmovgl %edi, %eax
// =>
// xorl %eax, %eax
// subl %esi, $edi
// cmovsl %eax, %edi
if (N->getOpcode() == ISD::SELECT && Cond.getOpcode() == ISD::SETCC &&
DAG.isEqualTo(LHS, Cond.getOperand(0)) &&
DAG.isEqualTo(RHS, Cond.getOperand(1))) {
ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
switch (CC) {
default: break;
case ISD::SETLT:
case ISD::SETGT: {
ISD::CondCode NewCC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGE;
Cond = DAG.getSetCC(Cond.getDebugLoc(), Cond.getValueType(),
Cond.getOperand(0), Cond.getOperand(1), NewCC);
return DAG.getNode(ISD::SELECT, DL, VT, Cond, LHS, RHS);
}
}
}
// If we know that this node is legal then we know that it is going to be
// matched by one of the SSE/AVX BLEND instructions. These instructions only
// depend on the highest bit in each word. Try to use SimplifyDemandedBits
// to simplify previous instructions.
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
if (N->getOpcode() == ISD::VSELECT && DCI.isBeforeLegalizeOps() &&
!DCI.isBeforeLegalize() &&
TLI.isOperationLegal(ISD::VSELECT, VT)) {
unsigned BitWidth = Cond.getValueType().getScalarType().getSizeInBits();
assert(BitWidth >= 8 && BitWidth <= 64 && "Invalid mask size");
APInt DemandedMask = APInt::getHighBitsSet(BitWidth, 1);
APInt KnownZero, KnownOne;
TargetLowering::TargetLoweringOpt TLO(DAG, DCI.isBeforeLegalize(),
DCI.isBeforeLegalizeOps());
if (TLO.ShrinkDemandedConstant(Cond, DemandedMask) ||
TLI.SimplifyDemandedBits(Cond, DemandedMask, KnownZero, KnownOne, TLO))
DCI.CommitTargetLoweringOpt(TLO);
}
return SDValue();
}
/// Optimize X86ISD::CMOV [LHS, RHS, CONDCODE (e.g. X86::COND_NE), CONDVAL]
static SDValue PerformCMOVCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI) {
DebugLoc DL = N->getDebugLoc();
// If the flag operand isn't dead, don't touch this CMOV.
if (N->getNumValues() == 2 && !SDValue(N, 1).use_empty())
return SDValue();
SDValue FalseOp = N->getOperand(0);
SDValue TrueOp = N->getOperand(1);
X86::CondCode CC = (X86::CondCode)N->getConstantOperandVal(2);
SDValue Cond = N->getOperand(3);
if (CC == X86::COND_E || CC == X86::COND_NE) {
switch (Cond.getOpcode()) {
default: break;
case X86ISD::BSR:
case X86ISD::BSF:
// If operand of BSR / BSF are proven never zero, then ZF cannot be set.
if (DAG.isKnownNeverZero(Cond.getOperand(0)))
return (CC == X86::COND_E) ? FalseOp : TrueOp;
}
}
// If this is a select between two integer constants, try to do some
// optimizations. Note that the operands are ordered the opposite of SELECT
// operands.
if (ConstantSDNode *TrueC = dyn_cast<ConstantSDNode>(TrueOp)) {
if (ConstantSDNode *FalseC = dyn_cast<ConstantSDNode>(FalseOp)) {
// Canonicalize the TrueC/FalseC values so that TrueC (the true value) is
// larger than FalseC (the false value).
if (TrueC->getAPIntValue().ult(FalseC->getAPIntValue())) {
CC = X86::GetOppositeBranchCondition(CC);
std::swap(TrueC, FalseC);
}
// Optimize C ? 8 : 0 -> zext(setcc(C)) << 3. Likewise for any pow2/0.
// This is efficient for any integer data type (including i8/i16) and
// shift amount.
if (FalseC->getAPIntValue() == 0 && TrueC->getAPIntValue().isPowerOf2()) {
Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
DAG.getConstant(CC, MVT::i8), Cond);
// Zero extend the condition if needed.
Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, TrueC->getValueType(0), Cond);
unsigned ShAmt = TrueC->getAPIntValue().logBase2();
Cond = DAG.getNode(ISD::SHL, DL, Cond.getValueType(), Cond,
DAG.getConstant(ShAmt, MVT::i8));
if (N->getNumValues() == 2) // Dead flag value?
return DCI.CombineTo(N, Cond, SDValue());
return Cond;
}
// Optimize Cond ? cst+1 : cst -> zext(setcc(C)+cst. This is efficient
// for any integer data type, including i8/i16.
if (FalseC->getAPIntValue()+1 == TrueC->getAPIntValue()) {
Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
DAG.getConstant(CC, MVT::i8), Cond);
// Zero extend the condition if needed.
Cond = DAG.getNode(ISD::ZERO_EXTEND, DL,
FalseC->getValueType(0), Cond);
Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
SDValue(FalseC, 0));
if (N->getNumValues() == 2) // Dead flag value?
return DCI.CombineTo(N, Cond, SDValue());
return Cond;
}
// Optimize cases that will turn into an LEA instruction. This requires
// an i32 or i64 and an efficient multiplier (1, 2, 3, 4, 5, 8, 9).
if (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i64) {
uint64_t Diff = TrueC->getZExtValue()-FalseC->getZExtValue();
if (N->getValueType(0) == MVT::i32) Diff = (unsigned)Diff;
bool isFastMultiplier = false;
if (Diff < 10) {
switch ((unsigned char)Diff) {
default: break;
case 1: // result = add base, cond
case 2: // result = lea base( , cond*2)
case 3: // result = lea base(cond, cond*2)
case 4: // result = lea base( , cond*4)
case 5: // result = lea base(cond, cond*4)
case 8: // result = lea base( , cond*8)
case 9: // result = lea base(cond, cond*8)
isFastMultiplier = true;
break;
}
}
if (isFastMultiplier) {
APInt Diff = TrueC->getAPIntValue()-FalseC->getAPIntValue();
Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
DAG.getConstant(CC, MVT::i8), Cond);
// Zero extend the condition if needed.
Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, FalseC->getValueType(0),
Cond);
// Scale the condition by the difference.
if (Diff != 1)
Cond = DAG.getNode(ISD::MUL, DL, Cond.getValueType(), Cond,
DAG.getConstant(Diff, Cond.getValueType()));
// Add the base if non-zero.
if (FalseC->getAPIntValue() != 0)
Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
SDValue(FalseC, 0));
if (N->getNumValues() == 2) // Dead flag value?
return DCI.CombineTo(N, Cond, SDValue());
return Cond;
}
}
}
}
return SDValue();
}
/// PerformMulCombine - Optimize a single multiply with constant into two
/// in order to implement it with two cheaper instructions, e.g.
/// LEA + SHL, LEA + LEA.
static SDValue PerformMulCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI) {
if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer())
return SDValue();
EVT VT = N->getValueType(0);
if (VT != MVT::i64)
return SDValue();
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1));
if (!C)
return SDValue();
uint64_t MulAmt = C->getZExtValue();
if (isPowerOf2_64(MulAmt) || MulAmt == 3 || MulAmt == 5 || MulAmt == 9)
return SDValue();
uint64_t MulAmt1 = 0;
uint64_t MulAmt2 = 0;
if ((MulAmt % 9) == 0) {
MulAmt1 = 9;
MulAmt2 = MulAmt / 9;
} else if ((MulAmt % 5) == 0) {
MulAmt1 = 5;
MulAmt2 = MulAmt / 5;
} else if ((MulAmt % 3) == 0) {
MulAmt1 = 3;
MulAmt2 = MulAmt / 3;
}
if (MulAmt2 &&
(isPowerOf2_64(MulAmt2) || MulAmt2 == 3 || MulAmt2 == 5 || MulAmt2 == 9)){
DebugLoc DL = N->getDebugLoc();
if (isPowerOf2_64(MulAmt2) &&
!(N->hasOneUse() && N->use_begin()->getOpcode() == ISD::ADD))
// If second multiplifer is pow2, issue it first. We want the multiply by
// 3, 5, or 9 to be folded into the addressing mode unless the lone use
// is an add.
std::swap(MulAmt1, MulAmt2);
SDValue NewMul;
if (isPowerOf2_64(MulAmt1))
NewMul = DAG.getNode(ISD::SHL, DL, VT, N->getOperand(0),
DAG.getConstant(Log2_64(MulAmt1), MVT::i8));
else
NewMul = DAG.getNode(X86ISD::MUL_IMM, DL, VT, N->getOperand(0),
DAG.getConstant(MulAmt1, VT));
if (isPowerOf2_64(MulAmt2))
NewMul = DAG.getNode(ISD::SHL, DL, VT, NewMul,
DAG.getConstant(Log2_64(MulAmt2), MVT::i8));
else
NewMul = DAG.getNode(X86ISD::MUL_IMM, DL, VT, NewMul,
DAG.getConstant(MulAmt2, VT));
// Do not add new nodes to DAG combiner worklist.
DCI.CombineTo(N, NewMul, false);
}
return SDValue();
}
static SDValue PerformSHLCombine(SDNode *N, SelectionDAG &DAG) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N0.getValueType();
// fold (shl (and (setcc_c), c1), c2) -> (and setcc_c, (c1 << c2))
// since the result of setcc_c is all zero's or all ones.
if (VT.isInteger() && !VT.isVector() &&
N1C && N0.getOpcode() == ISD::AND &&
N0.getOperand(1).getOpcode() == ISD::Constant) {
SDValue N00 = N0.getOperand(0);
if (N00.getOpcode() == X86ISD::SETCC_CARRY ||
((N00.getOpcode() == ISD::ANY_EXTEND ||
N00.getOpcode() == ISD::ZERO_EXTEND) &&
N00.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY)) {
APInt Mask = cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
APInt ShAmt = N1C->getAPIntValue();
Mask = Mask.shl(ShAmt);
if (Mask != 0)
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT,
N00, DAG.getConstant(Mask, VT));
}
}
// Hardware support for vector shifts is sparse which makes us scalarize the
// vector operations in many cases. Also, on sandybridge ADD is faster than
// shl.
// (shl V, 1) -> add V,V
if (isSplatVector(N1.getNode())) {
assert(N0.getValueType().isVector() && "Invalid vector shift type");
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1->getOperand(0));
// We shift all of the values by one. In many cases we do not have
// hardware support for this operation. This is better expressed as an ADD
// of two values.
if (N1C && (1 == N1C->getZExtValue())) {
return DAG.getNode(ISD::ADD, N->getDebugLoc(), VT, N0, N0);
}
}
return SDValue();
}
/// PerformShiftCombine - Transforms vector shift nodes to use vector shifts
/// when possible.
static SDValue PerformShiftCombine(SDNode* N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
EVT VT = N->getValueType(0);
if (N->getOpcode() == ISD::SHL) {
SDValue V = PerformSHLCombine(N, DAG);
if (V.getNode()) return V;
}
// On X86 with SSE2 support, we can transform this to a vector shift if
// all elements are shifted by the same amount. We can't do this in legalize
// because the a constant vector is typically transformed to a constant pool
// so we have no knowledge of the shift amount.
if (!Subtarget->hasSSE2())
return SDValue();
if (VT != MVT::v2i64 && VT != MVT::v4i32 && VT != MVT::v8i16 &&
(!Subtarget->hasAVX2() ||
(VT != MVT::v4i64 && VT != MVT::v8i32 && VT != MVT::v16i16)))
return SDValue();
SDValue ShAmtOp = N->getOperand(1);
EVT EltVT = VT.getVectorElementType();
DebugLoc DL = N->getDebugLoc();
SDValue BaseShAmt = SDValue();
if (ShAmtOp.getOpcode() == ISD::BUILD_VECTOR) {
unsigned NumElts = VT.getVectorNumElements();
unsigned i = 0;
for (; i != NumElts; ++i) {
SDValue Arg = ShAmtOp.getOperand(i);
if (Arg.getOpcode() == ISD::UNDEF) continue;
BaseShAmt = Arg;
break;
}
// Handle the case where the build_vector is all undef
// FIXME: Should DAG allow this?
if (i == NumElts)
return SDValue();
for (; i != NumElts; ++i) {
SDValue Arg = ShAmtOp.getOperand(i);
if (Arg.getOpcode() == ISD::UNDEF) continue;
if (Arg != BaseShAmt) {
return SDValue();
}
}
} else if (ShAmtOp.getOpcode() == ISD::VECTOR_SHUFFLE &&
cast<ShuffleVectorSDNode>(ShAmtOp)->isSplat()) {
SDValue InVec = ShAmtOp.getOperand(0);
if (InVec.getOpcode() == ISD::BUILD_VECTOR) {
unsigned NumElts = InVec.getValueType().getVectorNumElements();
unsigned i = 0;
for (; i != NumElts; ++i) {
SDValue Arg = InVec.getOperand(i);
if (Arg.getOpcode() == ISD::UNDEF) continue;
BaseShAmt = Arg;
break;
}
} else if (InVec.getOpcode() == ISD::INSERT_VECTOR_ELT) {
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(InVec.getOperand(2))) {
unsigned SplatIdx= cast<ShuffleVectorSDNode>(ShAmtOp)->getSplatIndex();
if (C->getZExtValue() == SplatIdx)
BaseShAmt = InVec.getOperand(1);
}
}
if (BaseShAmt.getNode() == 0) {
// Don't create instructions with illegal types after legalize
// types has run.
if (!DAG.getTargetLoweringInfo().isTypeLegal(EltVT) &&
!DCI.isBeforeLegalize())
return SDValue();
BaseShAmt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, EltVT, ShAmtOp,
DAG.getIntPtrConstant(0));
}
} else
return SDValue();
// The shift amount is an i32.
if (EltVT.bitsGT(MVT::i32))
BaseShAmt = DAG.getNode(ISD::TRUNCATE, DL, MVT::i32, BaseShAmt);
else if (EltVT.bitsLT(MVT::i32))
BaseShAmt = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i32, BaseShAmt);
// The shift amount is identical so we can do a vector shift.
SDValue ValOp = N->getOperand(0);
switch (N->getOpcode()) {
default:
llvm_unreachable("Unknown shift opcode!");
case ISD::SHL:
switch (VT.getSimpleVT().SimpleTy) {
default: return SDValue();
case MVT::v2i64:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v4i64:
case MVT::v8i32:
case MVT::v16i16:
return getTargetVShiftNode(X86ISD::VSHLI, DL, VT, ValOp, BaseShAmt, DAG);
}
case ISD::SRA:
switch (VT.getSimpleVT().SimpleTy) {
default: return SDValue();
case MVT::v4i32:
case MVT::v8i16:
case MVT::v8i32:
case MVT::v16i16:
return getTargetVShiftNode(X86ISD::VSRAI, DL, VT, ValOp, BaseShAmt, DAG);
}
case ISD::SRL:
switch (VT.getSimpleVT().SimpleTy) {
default: return SDValue();
case MVT::v2i64:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v4i64:
case MVT::v8i32:
case MVT::v16i16:
return getTargetVShiftNode(X86ISD::VSRLI, DL, VT, ValOp, BaseShAmt, DAG);
}
}
}
// CMPEQCombine - Recognize the distinctive (AND (setcc ...) (setcc ..))
// where both setccs reference the same FP CMP, and rewrite for CMPEQSS
// and friends. Likewise for OR -> CMPNEQSS.
static SDValue CMPEQCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
unsigned opcode;
// SSE1 supports CMP{eq|ne}SS, and SSE2 added CMP{eq|ne}SD, but
// we're requiring SSE2 for both.
if (Subtarget->hasSSE2() && isAndOrOfSetCCs(SDValue(N, 0U), opcode)) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue CMP0 = N0->getOperand(1);
SDValue CMP1 = N1->getOperand(1);
DebugLoc DL = N->getDebugLoc();
// The SETCCs should both refer to the same CMP.
if (CMP0.getOpcode() != X86ISD::CMP || CMP0 != CMP1)
return SDValue();
SDValue CMP00 = CMP0->getOperand(0);
SDValue CMP01 = CMP0->getOperand(1);
EVT VT = CMP00.getValueType();
if (VT == MVT::f32 || VT == MVT::f64) {
bool ExpectingFlags = false;
// Check for any users that want flags:
for (SDNode::use_iterator UI = N->use_begin(),
UE = N->use_end();
!ExpectingFlags && UI != UE; ++UI)
switch (UI->getOpcode()) {
default:
case ISD::BR_CC:
case ISD::BRCOND:
case ISD::SELECT:
ExpectingFlags = true;
break;
case ISD::CopyToReg:
case ISD::SIGN_EXTEND:
case ISD::ZERO_EXTEND:
case ISD::ANY_EXTEND:
break;
}
if (!ExpectingFlags) {
enum X86::CondCode cc0 = (enum X86::CondCode)N0.getConstantOperandVal(0);
enum X86::CondCode cc1 = (enum X86::CondCode)N1.getConstantOperandVal(0);
if (cc1 == X86::COND_E || cc1 == X86::COND_NE) {
X86::CondCode tmp = cc0;
cc0 = cc1;
cc1 = tmp;
}
if ((cc0 == X86::COND_E && cc1 == X86::COND_NP) ||
(cc0 == X86::COND_NE && cc1 == X86::COND_P)) {
bool is64BitFP = (CMP00.getValueType() == MVT::f64);
X86ISD::NodeType NTOperator = is64BitFP ?
X86ISD::FSETCCsd : X86ISD::FSETCCss;
// FIXME: need symbolic constants for these magic numbers.
// See X86ATTInstPrinter.cpp:printSSECC().
unsigned x86cc = (cc0 == X86::COND_E) ? 0 : 4;
SDValue OnesOrZeroesF = DAG.getNode(NTOperator, DL, MVT::f32, CMP00, CMP01,
DAG.getConstant(x86cc, MVT::i8));
SDValue OnesOrZeroesI = DAG.getNode(ISD::BITCAST, DL, MVT::i32,
OnesOrZeroesF);
SDValue ANDed = DAG.getNode(ISD::AND, DL, MVT::i32, OnesOrZeroesI,
DAG.getConstant(1, MVT::i32));
SDValue OneBitOfTruth = DAG.getNode(ISD::TRUNCATE, DL, MVT::i8, ANDed);
return OneBitOfTruth;
}
}
}
}
return SDValue();
}
/// CanFoldXORWithAllOnes - Test whether the XOR operand is a AllOnes vector
/// so it can be folded inside ANDNP.
static bool CanFoldXORWithAllOnes(const SDNode *N) {
EVT VT = N->getValueType(0);
// Match direct AllOnes for 128 and 256-bit vectors
if (ISD::isBuildVectorAllOnes(N))
return true;
// Look through a bit convert.
if (N->getOpcode() == ISD::BITCAST)
N = N->getOperand(0).getNode();
// Sometimes the operand may come from a insert_subvector building a 256-bit
// allones vector
if (VT.getSizeInBits() == 256 &&
N->getOpcode() == ISD::INSERT_SUBVECTOR) {
SDValue V1 = N->getOperand(0);
SDValue V2 = N->getOperand(1);
if (V1.getOpcode() == ISD::INSERT_SUBVECTOR &&
V1.getOperand(0).getOpcode() == ISD::UNDEF &&
ISD::isBuildVectorAllOnes(V1.getOperand(1).getNode()) &&
ISD::isBuildVectorAllOnes(V2.getNode()))
return true;
}
return false;
}
static SDValue PerformAndCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
if (DCI.isBeforeLegalizeOps())
return SDValue();
SDValue R = CMPEQCombine(N, DAG, DCI, Subtarget);
if (R.getNode())
return R;
EVT VT = N->getValueType(0);
// Create ANDN, BLSI, and BLSR instructions
// BLSI is X & (-X)
// BLSR is X & (X-1)
if (Subtarget->hasBMI() && (VT == MVT::i32 || VT == MVT::i64)) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
DebugLoc DL = N->getDebugLoc();
// Check LHS for not
if (N0.getOpcode() == ISD::XOR && isAllOnes(N0.getOperand(1)))
return DAG.getNode(X86ISD::ANDN, DL, VT, N0.getOperand(0), N1);
// Check RHS for not
if (N1.getOpcode() == ISD::XOR && isAllOnes(N1.getOperand(1)))
return DAG.getNode(X86ISD::ANDN, DL, VT, N1.getOperand(0), N0);
// Check LHS for neg
if (N0.getOpcode() == ISD::SUB && N0.getOperand(1) == N1 &&
isZero(N0.getOperand(0)))
return DAG.getNode(X86ISD::BLSI, DL, VT, N1);
// Check RHS for neg
if (N1.getOpcode() == ISD::SUB && N1.getOperand(1) == N0 &&
isZero(N1.getOperand(0)))
return DAG.getNode(X86ISD::BLSI, DL, VT, N0);
// Check LHS for X-1
if (N0.getOpcode() == ISD::ADD && N0.getOperand(0) == N1 &&
isAllOnes(N0.getOperand(1)))
return DAG.getNode(X86ISD::BLSR, DL, VT, N1);
// Check RHS for X-1
if (N1.getOpcode() == ISD::ADD && N1.getOperand(0) == N0 &&
isAllOnes(N1.getOperand(1)))
return DAG.getNode(X86ISD::BLSR, DL, VT, N0);
return SDValue();
}
// Want to form ANDNP nodes:
// 1) In the hopes of then easily combining them with OR and AND nodes
// to form PBLEND/PSIGN.
// 2) To match ANDN packed intrinsics
if (VT != MVT::v2i64 && VT != MVT::v4i64)
return SDValue();
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
DebugLoc DL = N->getDebugLoc();
// Check LHS for vnot
if (N0.getOpcode() == ISD::XOR &&
//ISD::isBuildVectorAllOnes(N0.getOperand(1).getNode()))
CanFoldXORWithAllOnes(N0.getOperand(1).getNode()))
return DAG.getNode(X86ISD::ANDNP, DL, VT, N0.getOperand(0), N1);
// Check RHS for vnot
if (N1.getOpcode() == ISD::XOR &&
//ISD::isBuildVectorAllOnes(N1.getOperand(1).getNode()))
CanFoldXORWithAllOnes(N1.getOperand(1).getNode()))
return DAG.getNode(X86ISD::ANDNP, DL, VT, N1.getOperand(0), N0);
return SDValue();
}
static SDValue PerformOrCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
if (DCI.isBeforeLegalizeOps())
return SDValue();
SDValue R = CMPEQCombine(N, DAG, DCI, Subtarget);
if (R.getNode())
return R;
EVT VT = N->getValueType(0);
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
// look for psign/blend
if (VT == MVT::v2i64 || VT == MVT::v4i64) {
if (!Subtarget->hasSSSE3() ||
(VT == MVT::v4i64 && !Subtarget->hasAVX2()))
return SDValue();
// Canonicalize pandn to RHS
if (N0.getOpcode() == X86ISD::ANDNP)
std::swap(N0, N1);
// or (and (m, y), (pandn m, x))
if (N0.getOpcode() == ISD::AND && N1.getOpcode() == X86ISD::ANDNP) {
SDValue Mask = N1.getOperand(0);
SDValue X = N1.getOperand(1);
SDValue Y;
if (N0.getOperand(0) == Mask)
Y = N0.getOperand(1);
if (N0.getOperand(1) == Mask)
Y = N0.getOperand(0);
// Check to see if the mask appeared in both the AND and ANDNP and
if (!Y.getNode())
return SDValue();
// Validate that X, Y, and Mask are BIT_CONVERTS, and see through them.
// Look through mask bitcast.
if (Mask.getOpcode() == ISD::BITCAST)
Mask = Mask.getOperand(0);
if (X.getOpcode() == ISD::BITCAST)
X = X.getOperand(0);
if (Y.getOpcode() == ISD::BITCAST)
Y = Y.getOperand(0);
EVT MaskVT = Mask.getValueType();
// Validate that the Mask operand is a vector sra node.
// FIXME: what to do for bytes, since there is a psignb/pblendvb, but
// there is no psrai.b
if (Mask.getOpcode() != X86ISD::VSRAI)
return SDValue();
// Check that the SRA is all signbits.
SDValue SraC = Mask.getOperand(1);
unsigned SraAmt = cast<ConstantSDNode>(SraC)->getZExtValue();
unsigned EltBits = MaskVT.getVectorElementType().getSizeInBits();
if ((SraAmt + 1) != EltBits)
return SDValue();
DebugLoc DL = N->getDebugLoc();
// Now we know we at least have a plendvb with the mask val. See if
// we can form a psignb/w/d.
// psign = x.type == y.type == mask.type && y = sub(0, x);
if (Y.getOpcode() == ISD::SUB && Y.getOperand(1) == X &&
ISD::isBuildVectorAllZeros(Y.getOperand(0).getNode()) &&
X.getValueType() == MaskVT && Y.getValueType() == MaskVT) {
assert((EltBits == 8 || EltBits == 16 || EltBits == 32) &&
"Unsupported VT for PSIGN");
Mask = DAG.getNode(X86ISD::PSIGN, DL, MaskVT, X, Mask.getOperand(0));
return DAG.getNode(ISD::BITCAST, DL, VT, Mask);
}
// PBLENDVB only available on SSE 4.1
if (!Subtarget->hasSSE41())
return SDValue();
EVT BlendVT = (VT == MVT::v4i64) ? MVT::v32i8 : MVT::v16i8;
X = DAG.getNode(ISD::BITCAST, DL, BlendVT, X);
Y = DAG.getNode(ISD::BITCAST, DL, BlendVT, Y);
Mask = DAG.getNode(ISD::BITCAST, DL, BlendVT, Mask);
Mask = DAG.getNode(ISD::VSELECT, DL, BlendVT, Mask, Y, X);
return DAG.getNode(ISD::BITCAST, DL, VT, Mask);
}
}
if (VT != MVT::i16 && VT != MVT::i32 && VT != MVT::i64)
return SDValue();
// fold (or (x << c) | (y >> (64 - c))) ==> (shld64 x, y, c)
if (N0.getOpcode() == ISD::SRL && N1.getOpcode() == ISD::SHL)
std::swap(N0, N1);
if (N0.getOpcode() != ISD::SHL || N1.getOpcode() != ISD::SRL)
return SDValue();
if (!N0.hasOneUse() || !N1.hasOneUse())
return SDValue();
SDValue ShAmt0 = N0.getOperand(1);
if (ShAmt0.getValueType() != MVT::i8)
return SDValue();
SDValue ShAmt1 = N1.getOperand(1);
if (ShAmt1.getValueType() != MVT::i8)
return SDValue();
if (ShAmt0.getOpcode() == ISD::TRUNCATE)
ShAmt0 = ShAmt0.getOperand(0);
if (ShAmt1.getOpcode() == ISD::TRUNCATE)
ShAmt1 = ShAmt1.getOperand(0);
DebugLoc DL = N->getDebugLoc();
unsigned Opc = X86ISD::SHLD;
SDValue Op0 = N0.getOperand(0);
SDValue Op1 = N1.getOperand(0);
if (ShAmt0.getOpcode() == ISD::SUB) {
Opc = X86ISD::SHRD;
std::swap(Op0, Op1);
std::swap(ShAmt0, ShAmt1);
}
unsigned Bits = VT.getSizeInBits();
if (ShAmt1.getOpcode() == ISD::SUB) {
SDValue Sum = ShAmt1.getOperand(0);
if (ConstantSDNode *SumC = dyn_cast<ConstantSDNode>(Sum)) {
SDValue ShAmt1Op1 = ShAmt1.getOperand(1);
if (ShAmt1Op1.getNode()->getOpcode() == ISD::TRUNCATE)
ShAmt1Op1 = ShAmt1Op1.getOperand(0);
if (SumC->getSExtValue() == Bits && ShAmt1Op1 == ShAmt0)
return DAG.getNode(Opc, DL, VT,
Op0, Op1,
DAG.getNode(ISD::TRUNCATE, DL,
MVT::i8, ShAmt0));
}
} else if (ConstantSDNode *ShAmt1C = dyn_cast<ConstantSDNode>(ShAmt1)) {
ConstantSDNode *ShAmt0C = dyn_cast<ConstantSDNode>(ShAmt0);
if (ShAmt0C &&
ShAmt0C->getSExtValue() + ShAmt1C->getSExtValue() == Bits)
return DAG.getNode(Opc, DL, VT,
N0.getOperand(0), N1.getOperand(0),
DAG.getNode(ISD::TRUNCATE, DL,
MVT::i8, ShAmt0));
}
return SDValue();
}
// PerformXorCombine - Attempts to turn XOR nodes into BLSMSK nodes
static SDValue PerformXorCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
if (DCI.isBeforeLegalizeOps())
return SDValue();
EVT VT = N->getValueType(0);
if (VT != MVT::i32 && VT != MVT::i64)
return SDValue();
assert(Subtarget->hasBMI() && "Creating BLSMSK requires BMI instructions");
// Create BLSMSK instructions by finding X ^ (X-1)
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
DebugLoc DL = N->getDebugLoc();
if (N0.getOpcode() == ISD::ADD && N0.getOperand(0) == N1 &&
isAllOnes(N0.getOperand(1)))
return DAG.getNode(X86ISD::BLSMSK, DL, VT, N1);
if (N1.getOpcode() == ISD::ADD && N1.getOperand(0) == N0 &&
isAllOnes(N1.getOperand(1)))
return DAG.getNode(X86ISD::BLSMSK, DL, VT, N0);
return SDValue();
}
/// PerformLOADCombine - Do target-specific dag combines on LOAD nodes.
static SDValue PerformLOADCombine(SDNode *N, SelectionDAG &DAG,
const X86Subtarget *Subtarget) {
LoadSDNode *Ld = cast<LoadSDNode>(N);
EVT RegVT = Ld->getValueType(0);
EVT MemVT = Ld->getMemoryVT();
DebugLoc dl = Ld->getDebugLoc();
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
ISD::LoadExtType Ext = Ld->getExtensionType();
// If this is a vector EXT Load then attempt to optimize it using a
// shuffle. We need SSE4 for the shuffles.
// TODO: It is possible to support ZExt by zeroing the undef values
// during the shuffle phase or after the shuffle.
if (RegVT.isVector() && RegVT.isInteger() &&
Ext == ISD::EXTLOAD && Subtarget->hasSSE41()) {
assert(MemVT != RegVT && "Cannot extend to the same type");
assert(MemVT.isVector() && "Must load a vector from memory");
unsigned NumElems = RegVT.getVectorNumElements();
unsigned RegSz = RegVT.getSizeInBits();
unsigned MemSz = MemVT.getSizeInBits();
assert(RegSz > MemSz && "Register size must be greater than the mem size");
// All sizes must be a power of two
if (!isPowerOf2_32(RegSz * MemSz * NumElems)) return SDValue();
// Attempt to load the original value using a single load op.
// Find a scalar type which is equal to the loaded word size.
MVT SclrLoadTy = MVT::i8;
for (unsigned tp = MVT::FIRST_INTEGER_VALUETYPE;
tp < MVT::LAST_INTEGER_VALUETYPE; ++tp) {
MVT Tp = (MVT::SimpleValueType)tp;
if (TLI.isTypeLegal(Tp) && Tp.getSizeInBits() == MemSz) {
SclrLoadTy = Tp;
break;
}
}
// Proceed if a load word is found.
if (SclrLoadTy.getSizeInBits() != MemSz) return SDValue();
EVT LoadUnitVecVT = EVT::getVectorVT(*DAG.getContext(), SclrLoadTy,
RegSz/SclrLoadTy.getSizeInBits());
EVT WideVecVT = EVT::getVectorVT(*DAG.getContext(), MemVT.getScalarType(),
RegSz/MemVT.getScalarType().getSizeInBits());
// Can't shuffle using an illegal type.
if (!TLI.isTypeLegal(WideVecVT)) return SDValue();
// Perform a single load.
SDValue ScalarLoad = DAG.getLoad(SclrLoadTy, dl, Ld->getChain(),
Ld->getBasePtr(),
Ld->getPointerInfo(), Ld->isVolatile(),
Ld->isNonTemporal(), Ld->isInvariant(),
Ld->getAlignment());
// Insert the word loaded into a vector.
SDValue ScalarInVector = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
LoadUnitVecVT, ScalarLoad);
// Bitcast the loaded value to a vector of the original element type, in
// the size of the target vector type.
SDValue SlicedVec = DAG.getNode(ISD::BITCAST, dl, WideVecVT,
ScalarInVector);
unsigned SizeRatio = RegSz/MemSz;
// Redistribute the loaded elements into the different locations.
SmallVector<int, 8> ShuffleVec(NumElems * SizeRatio, -1);
for (unsigned i = 0; i < NumElems; i++) ShuffleVec[i*SizeRatio] = i;
SDValue Shuff = DAG.getVectorShuffle(WideVecVT, dl, SlicedVec,
DAG.getUNDEF(WideVecVT),
&ShuffleVec[0]);
// Bitcast to the requested type.
Shuff = DAG.getNode(ISD::BITCAST, dl, RegVT, Shuff);
// Replace the original load with the new sequence
// and return the new chain.
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 0), Shuff);
return SDValue(ScalarLoad.getNode(), 1);
}
return SDValue();
}
/// PerformSTORECombine - Do target-specific dag combines on STORE nodes.
static SDValue PerformSTORECombine(SDNode *N, SelectionDAG &DAG,
const X86Subtarget *Subtarget) {
StoreSDNode *St = cast<StoreSDNode>(N);
EVT VT = St->getValue().getValueType();
EVT StVT = St->getMemoryVT();
DebugLoc dl = St->getDebugLoc();
SDValue StoredVal = St->getOperand(1);
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
// If we are saving a concatenation of two XMM registers, perform two stores.
// This is better in Sandy Bridge cause one 256-bit mem op is done via two
// 128-bit ones. If in the future the cost becomes only one memory access the
// first version would be better.
if (VT.getSizeInBits() == 256 &&
StoredVal.getNode()->getOpcode() == ISD::CONCAT_VECTORS &&
StoredVal.getNumOperands() == 2) {
SDValue Value0 = StoredVal.getOperand(0);
SDValue Value1 = StoredVal.getOperand(1);
SDValue Stride = DAG.getConstant(16, TLI.getPointerTy());
SDValue Ptr0 = St->getBasePtr();
SDValue Ptr1 = DAG.getNode(ISD::ADD, dl, Ptr0.getValueType(), Ptr0, Stride);
SDValue Ch0 = DAG.getStore(St->getChain(), dl, Value0, Ptr0,
St->getPointerInfo(), St->isVolatile(),
St->isNonTemporal(), St->getAlignment());
SDValue Ch1 = DAG.getStore(St->getChain(), dl, Value1, Ptr1,
St->getPointerInfo(), St->isVolatile(),
St->isNonTemporal(), St->getAlignment());
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Ch0, Ch1);
}
// Optimize trunc store (of multiple scalars) to shuffle and store.
// First, pack all of the elements in one place. Next, store to memory
// in fewer chunks.
if (St->isTruncatingStore() && VT.isVector()) {
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
unsigned NumElems = VT.getVectorNumElements();
assert(StVT != VT && "Cannot truncate to the same type");
unsigned FromSz = VT.getVectorElementType().getSizeInBits();
unsigned ToSz = StVT.getVectorElementType().getSizeInBits();
// From, To sizes and ElemCount must be pow of two
if (!isPowerOf2_32(NumElems * FromSz * ToSz)) return SDValue();
// We are going to use the original vector elt for storing.
// Accumulated smaller vector elements must be a multiple of the store size.
if (0 != (NumElems * FromSz) % ToSz) return SDValue();
unsigned SizeRatio = FromSz / ToSz;
assert(SizeRatio * NumElems * ToSz == VT.getSizeInBits());
// Create a type on which we perform the shuffle
EVT WideVecVT = EVT::getVectorVT(*DAG.getContext(),
StVT.getScalarType(), NumElems*SizeRatio);
assert(WideVecVT.getSizeInBits() == VT.getSizeInBits());
SDValue WideVec = DAG.getNode(ISD::BITCAST, dl, WideVecVT, St->getValue());
SmallVector<int, 8> ShuffleVec(NumElems * SizeRatio, -1);
for (unsigned i = 0; i < NumElems; i++ ) ShuffleVec[i] = i * SizeRatio;
// Can't shuffle using an illegal type
if (!TLI.isTypeLegal(WideVecVT)) return SDValue();
SDValue Shuff = DAG.getVectorShuffle(WideVecVT, dl, WideVec,
DAG.getUNDEF(WideVecVT),
&ShuffleVec[0]);
// At this point all of the data is stored at the bottom of the
// register. We now need to save it to mem.
// Find the largest store unit
MVT StoreType = MVT::i8;
for (unsigned tp = MVT::FIRST_INTEGER_VALUETYPE;
tp < MVT::LAST_INTEGER_VALUETYPE; ++tp) {
MVT Tp = (MVT::SimpleValueType)tp;
if (TLI.isTypeLegal(Tp) && StoreType.getSizeInBits() < NumElems * ToSz)
StoreType = Tp;
}
// Bitcast the original vector into a vector of store-size units
EVT StoreVecVT = EVT::getVectorVT(*DAG.getContext(),
StoreType, VT.getSizeInBits()/EVT(StoreType).getSizeInBits());
assert(StoreVecVT.getSizeInBits() == VT.getSizeInBits());
SDValue ShuffWide = DAG.getNode(ISD::BITCAST, dl, StoreVecVT, Shuff);
SmallVector<SDValue, 8> Chains;
SDValue Increment = DAG.getConstant(StoreType.getSizeInBits()/8,
TLI.getPointerTy());
SDValue Ptr = St->getBasePtr();
// Perform one or more big stores into memory.
for (unsigned i = 0; i < (ToSz*NumElems)/StoreType.getSizeInBits() ; i++) {
SDValue SubVec = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
StoreType, ShuffWide,
DAG.getIntPtrConstant(i));
SDValue Ch = DAG.getStore(St->getChain(), dl, SubVec, Ptr,
St->getPointerInfo(), St->isVolatile(),
St->isNonTemporal(), St->getAlignment());
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
Chains.push_back(Ch);
}
return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &Chains[0],
Chains.size());
}
// Turn load->store of MMX types into GPR load/stores. This avoids clobbering
// the FP state in cases where an emms may be missing.
// A preferable solution to the general problem is to figure out the right
// places to insert EMMS. This qualifies as a quick hack.
// Similarly, turn load->store of i64 into double load/stores in 32-bit mode.
if (VT.getSizeInBits() != 64)
return SDValue();
const Function *F = DAG.getMachineFunction().getFunction();
bool NoImplicitFloatOps = F->hasFnAttr(Attribute::NoImplicitFloat);
bool F64IsLegal = !DAG.getTarget().Options.UseSoftFloat && !NoImplicitFloatOps
&& Subtarget->hasSSE2();
if ((VT.isVector() ||
(VT == MVT::i64 && F64IsLegal && !Subtarget->is64Bit())) &&
isa<LoadSDNode>(St->getValue()) &&
!cast<LoadSDNode>(St->getValue())->isVolatile() &&
St->getChain().hasOneUse() && !St->isVolatile()) {
SDNode* LdVal = St->getValue().getNode();
LoadSDNode *Ld = 0;
int TokenFactorIndex = -1;
SmallVector<SDValue, 8> Ops;
SDNode* ChainVal = St->getChain().getNode();
// Must be a store of a load. We currently handle two cases: the load
// is a direct child, and it's under an intervening TokenFactor. It is
// possible to dig deeper under nested TokenFactors.
if (ChainVal == LdVal)
Ld = cast<LoadSDNode>(St->getChain());
else if (St->getValue().hasOneUse() &&
ChainVal->getOpcode() == ISD::TokenFactor) {
for (unsigned i = 0, e = ChainVal->getNumOperands(); i != e; ++i) {
if (ChainVal->getOperand(i).getNode() == LdVal) {
TokenFactorIndex = i;
Ld = cast<LoadSDNode>(St->getValue());
} else
Ops.push_back(ChainVal->getOperand(i));
}
}
if (!Ld || !ISD::isNormalLoad(Ld))
return SDValue();
// If this is not the MMX case, i.e. we are just turning i64 load/store
// into f64 load/store, avoid the transformation if there are multiple
// uses of the loaded value.
if (!VT.isVector() && !Ld->hasNUsesOfValue(1, 0))
return SDValue();
DebugLoc LdDL = Ld->getDebugLoc();
DebugLoc StDL = N->getDebugLoc();
// If we are a 64-bit capable x86, lower to a single movq load/store pair.
// Otherwise, if it's legal to use f64 SSE instructions, use f64 load/store
// pair instead.
if (Subtarget->is64Bit() || F64IsLegal) {
EVT LdVT = Subtarget->is64Bit() ? MVT::i64 : MVT::f64;
SDValue NewLd = DAG.getLoad(LdVT, LdDL, Ld->getChain(), Ld->getBasePtr(),
Ld->getPointerInfo(), Ld->isVolatile(),
Ld->isNonTemporal(), Ld->isInvariant(),
Ld->getAlignment());
SDValue NewChain = NewLd.getValue(1);
if (TokenFactorIndex != -1) {
Ops.push_back(NewChain);
NewChain = DAG.getNode(ISD::TokenFactor, LdDL, MVT::Other, &Ops[0],
Ops.size());
}
return DAG.getStore(NewChain, StDL, NewLd, St->getBasePtr(),
St->getPointerInfo(),
St->isVolatile(), St->isNonTemporal(),
St->getAlignment());
}
// Otherwise, lower to two pairs of 32-bit loads / stores.
SDValue LoAddr = Ld->getBasePtr();
SDValue HiAddr = DAG.getNode(ISD::ADD, LdDL, MVT::i32, LoAddr,
DAG.getConstant(4, MVT::i32));
SDValue LoLd = DAG.getLoad(MVT::i32, LdDL, Ld->getChain(), LoAddr,
Ld->getPointerInfo(),
Ld->isVolatile(), Ld->isNonTemporal(),
Ld->isInvariant(), Ld->getAlignment());
SDValue HiLd = DAG.getLoad(MVT::i32, LdDL, Ld->getChain(), HiAddr,
Ld->getPointerInfo().getWithOffset(4),
Ld->isVolatile(), Ld->isNonTemporal(),
Ld->isInvariant(),
MinAlign(Ld->getAlignment(), 4));
SDValue NewChain = LoLd.getValue(1);
if (TokenFactorIndex != -1) {
Ops.push_back(LoLd);
Ops.push_back(HiLd);
NewChain = DAG.getNode(ISD::TokenFactor, LdDL, MVT::Other, &Ops[0],
Ops.size());
}
LoAddr = St->getBasePtr();
HiAddr = DAG.getNode(ISD::ADD, StDL, MVT::i32, LoAddr,
DAG.getConstant(4, MVT::i32));
SDValue LoSt = DAG.getStore(NewChain, StDL, LoLd, LoAddr,
St->getPointerInfo(),
St->isVolatile(), St->isNonTemporal(),
St->getAlignment());
SDValue HiSt = DAG.getStore(NewChain, StDL, HiLd, HiAddr,
St->getPointerInfo().getWithOffset(4),
St->isVolatile(),
St->isNonTemporal(),
MinAlign(St->getAlignment(), 4));
return DAG.getNode(ISD::TokenFactor, StDL, MVT::Other, LoSt, HiSt);
}
return SDValue();
}
/// isHorizontalBinOp - Return 'true' if this vector operation is "horizontal"
/// and return the operands for the horizontal operation in LHS and RHS. A
/// horizontal operation performs the binary operation on successive elements
/// of its first operand, then on successive elements of its second operand,
/// returning the resulting values in a vector. For example, if
/// A = < float a0, float a1, float a2, float a3 >
/// and
/// B = < float b0, float b1, float b2, float b3 >
/// then the result of doing a horizontal operation on A and B is
/// A horizontal-op B = < a0 op a1, a2 op a3, b0 op b1, b2 op b3 >.
/// In short, LHS and RHS are inspected to see if LHS op RHS is of the form
/// A horizontal-op B, for some already available A and B, and if so then LHS is
/// set to A, RHS to B, and the routine returns 'true'.
/// Note that the binary operation should have the property that if one of the
/// operands is UNDEF then the result is UNDEF.
static bool isHorizontalBinOp(SDValue &LHS, SDValue &RHS, bool IsCommutative) {
// Look for the following pattern: if
// A = < float a0, float a1, float a2, float a3 >
// B = < float b0, float b1, float b2, float b3 >
// and
// LHS = VECTOR_SHUFFLE A, B, <0, 2, 4, 6>
// RHS = VECTOR_SHUFFLE A, B, <1, 3, 5, 7>
// then LHS op RHS = < a0 op a1, a2 op a3, b0 op b1, b2 op b3 >
// which is A horizontal-op B.
// At least one of the operands should be a vector shuffle.
if (LHS.getOpcode() != ISD::VECTOR_SHUFFLE &&
RHS.getOpcode() != ISD::VECTOR_SHUFFLE)
return false;
EVT VT = LHS.getValueType();
assert((VT.is128BitVector() || VT.is256BitVector()) &&
"Unsupported vector type for horizontal add/sub");
// Handle 128 and 256-bit vector lengths. AVX defines horizontal add/sub to
// operate independently on 128-bit lanes.
unsigned NumElts = VT.getVectorNumElements();
unsigned NumLanes = VT.getSizeInBits()/128;
unsigned NumLaneElts = NumElts / NumLanes;
assert((NumLaneElts % 2 == 0) &&
"Vector type should have an even number of elements in each lane");
unsigned HalfLaneElts = NumLaneElts/2;
// View LHS in the form
// LHS = VECTOR_SHUFFLE A, B, LMask
// If LHS is not a shuffle then pretend it is the shuffle
// LHS = VECTOR_SHUFFLE LHS, undef, <0, 1, ..., N-1>
// NOTE: in what follows a default initialized SDValue represents an UNDEF of
// type VT.
SDValue A, B;
SmallVector<int, 16> LMask(NumElts);
if (LHS.getOpcode() == ISD::VECTOR_SHUFFLE) {
if (LHS.getOperand(0).getOpcode() != ISD::UNDEF)
A = LHS.getOperand(0);
if (LHS.getOperand(1).getOpcode() != ISD::UNDEF)
B = LHS.getOperand(1);
ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(LHS.getNode())->getMask();
std::copy(Mask.begin(), Mask.end(), LMask.begin());
} else {
if (LHS.getOpcode() != ISD::UNDEF)
A = LHS;
for (unsigned i = 0; i != NumElts; ++i)
LMask[i] = i;
}
// Likewise, view RHS in the form
// RHS = VECTOR_SHUFFLE C, D, RMask
SDValue C, D;
SmallVector<int, 16> RMask(NumElts);
if (RHS.getOpcode() == ISD::VECTOR_SHUFFLE) {
if (RHS.getOperand(0).getOpcode() != ISD::UNDEF)
C = RHS.getOperand(0);
if (RHS.getOperand(1).getOpcode() != ISD::UNDEF)
D = RHS.getOperand(1);
ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(RHS.getNode())->getMask();
std::copy(Mask.begin(), Mask.end(), RMask.begin());
} else {
if (RHS.getOpcode() != ISD::UNDEF)
C = RHS;
for (unsigned i = 0; i != NumElts; ++i)
RMask[i] = i;
}
// Check that the shuffles are both shuffling the same vectors.
if (!(A == C && B == D) && !(A == D && B == C))
return false;
// If everything is UNDEF then bail out: it would be better to fold to UNDEF.
if (!A.getNode() && !B.getNode())
return false;
// If A and B occur in reverse order in RHS, then "swap" them (which means
// rewriting the mask).
if (A != C)
CommuteVectorShuffleMask(RMask, NumElts);
// At this point LHS and RHS are equivalent to
// LHS = VECTOR_SHUFFLE A, B, LMask
// RHS = VECTOR_SHUFFLE A, B, RMask
// Check that the masks correspond to performing a horizontal operation.
for (unsigned i = 0; i != NumElts; ++i) {
int LIdx = LMask[i], RIdx = RMask[i];
// Ignore any UNDEF components.
if (LIdx < 0 || RIdx < 0 ||
(!A.getNode() && (LIdx < (int)NumElts || RIdx < (int)NumElts)) ||
(!B.getNode() && (LIdx >= (int)NumElts || RIdx >= (int)NumElts)))
continue;
// Check that successive elements are being operated on. If not, this is
// not a horizontal operation.
unsigned Src = (i/HalfLaneElts) % 2; // each lane is split between srcs
unsigned LaneStart = (i/NumLaneElts) * NumLaneElts;
int Index = 2*(i%HalfLaneElts) + NumElts*Src + LaneStart;
if (!(LIdx == Index && RIdx == Index + 1) &&
!(IsCommutative && LIdx == Index + 1 && RIdx == Index))
return false;
}
LHS = A.getNode() ? A : B; // If A is 'UNDEF', use B for it.
RHS = B.getNode() ? B : A; // If B is 'UNDEF', use A for it.
return true;
}
/// PerformFADDCombine - Do target-specific dag combines on floating point adds.
static SDValue PerformFADDCombine(SDNode *N, SelectionDAG &DAG,
const X86Subtarget *Subtarget) {
EVT VT = N->getValueType(0);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
// Try to synthesize horizontal adds from adds of shuffles.
if (((Subtarget->hasSSE3() && (VT == MVT::v4f32 || VT == MVT::v2f64)) ||
(Subtarget->hasAVX() && (VT == MVT::v8f32 || VT == MVT::v4f64))) &&
isHorizontalBinOp(LHS, RHS, true))
return DAG.getNode(X86ISD::FHADD, N->getDebugLoc(), VT, LHS, RHS);
return SDValue();
}
/// PerformFSUBCombine - Do target-specific dag combines on floating point subs.
static SDValue PerformFSUBCombine(SDNode *N, SelectionDAG &DAG,
const X86Subtarget *Subtarget) {
EVT VT = N->getValueType(0);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
// Try to synthesize horizontal subs from subs of shuffles.
if (((Subtarget->hasSSE3() && (VT == MVT::v4f32 || VT == MVT::v2f64)) ||
(Subtarget->hasAVX() && (VT == MVT::v8f32 || VT == MVT::v4f64))) &&
isHorizontalBinOp(LHS, RHS, false))
return DAG.getNode(X86ISD::FHSUB, N->getDebugLoc(), VT, LHS, RHS);
return SDValue();
}
/// PerformFORCombine - Do target-specific dag combines on X86ISD::FOR and
/// X86ISD::FXOR nodes.
static SDValue PerformFORCombine(SDNode *N, SelectionDAG &DAG) {
assert(N->getOpcode() == X86ISD::FOR || N->getOpcode() == X86ISD::FXOR);
// F[X]OR(0.0, x) -> x
// F[X]OR(x, 0.0) -> x
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
if (C->getValueAPF().isPosZero())
return N->getOperand(1);
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
if (C->getValueAPF().isPosZero())
return N->getOperand(0);
return SDValue();
}
/// PerformFANDCombine - Do target-specific dag combines on X86ISD::FAND nodes.
static SDValue PerformFANDCombine(SDNode *N, SelectionDAG &DAG) {
// FAND(0.0, x) -> 0.0
// FAND(x, 0.0) -> 0.0
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
if (C->getValueAPF().isPosZero())
return N->getOperand(0);
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
if (C->getValueAPF().isPosZero())
return N->getOperand(1);
return SDValue();
}
static SDValue PerformBTCombine(SDNode *N,
SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI) {
// BT ignores high bits in the bit index operand.
SDValue Op1 = N->getOperand(1);
if (Op1.hasOneUse()) {
unsigned BitWidth = Op1.getValueSizeInBits();
APInt DemandedMask = APInt::getLowBitsSet(BitWidth, Log2_32(BitWidth));
APInt KnownZero, KnownOne;
TargetLowering::TargetLoweringOpt TLO(DAG, !DCI.isBeforeLegalize(),
!DCI.isBeforeLegalizeOps());
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
if (TLO.ShrinkDemandedConstant(Op1, DemandedMask) ||
TLI.SimplifyDemandedBits(Op1, DemandedMask, KnownZero, KnownOne, TLO))
DCI.CommitTargetLoweringOpt(TLO);
}
return SDValue();
}
static SDValue PerformVZEXT_MOVLCombine(SDNode *N, SelectionDAG &DAG) {
SDValue Op = N->getOperand(0);
if (Op.getOpcode() == ISD::BITCAST)
Op = Op.getOperand(0);
EVT VT = N->getValueType(0), OpVT = Op.getValueType();
if (Op.getOpcode() == X86ISD::VZEXT_LOAD &&
VT.getVectorElementType().getSizeInBits() ==
OpVT.getVectorElementType().getSizeInBits()) {
return DAG.getNode(ISD::BITCAST, N->getDebugLoc(), VT, Op);
}
return SDValue();
}
static SDValue PerformSExtCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
if (!DCI.isBeforeLegalizeOps())
return SDValue();
if (!Subtarget->hasAVX())
return SDValue();
EVT VT = N->getValueType(0);
SDValue Op = N->getOperand(0);
EVT OpVT = Op.getValueType();
DebugLoc dl = N->getDebugLoc();
if ((VT == MVT::v4i64 && OpVT == MVT::v4i32) ||
(VT == MVT::v8i32 && OpVT == MVT::v8i16)) {
if (Subtarget->hasAVX2())
return DAG.getNode(X86ISD::VSEXT_MOVL, dl, VT, Op);
// Optimize vectors in AVX mode
// Sign extend v8i16 to v8i32 and
// v4i32 to v4i64
//
// Divide input vector into two parts
// for v4i32 the shuffle mask will be { 0, 1, -1, -1} {2, 3, -1, -1}
// use vpmovsx instruction to extend v4i32 -> v2i64; v8i16 -> v4i32
// concat the vectors to original VT
unsigned NumElems = OpVT.getVectorNumElements();
SmallVector<int,8> ShufMask1(NumElems, -1);
for (unsigned i = 0; i != NumElems/2; ++i)
ShufMask1[i] = i;
SDValue OpLo = DAG.getVectorShuffle(OpVT, dl, Op, DAG.getUNDEF(OpVT),
&ShufMask1[0]);
SmallVector<int,8> ShufMask2(NumElems, -1);
for (unsigned i = 0; i != NumElems/2; ++i)
ShufMask2[i] = i + NumElems/2;
SDValue OpHi = DAG.getVectorShuffle(OpVT, dl, Op, DAG.getUNDEF(OpVT),
&ShufMask2[0]);
EVT HalfVT = EVT::getVectorVT(*DAG.getContext(), VT.getScalarType(),
VT.getVectorNumElements()/2);
OpLo = DAG.getNode(X86ISD::VSEXT_MOVL, dl, HalfVT, OpLo);
OpHi = DAG.getNode(X86ISD::VSEXT_MOVL, dl, HalfVT, OpHi);
return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, OpLo, OpHi);
}
return SDValue();
}
static SDValue PerformZExtCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
// (i32 zext (and (i8 x86isd::setcc_carry), 1)) ->
// (and (i32 x86isd::setcc_carry), 1)
// This eliminates the zext. This transformation is necessary because
// ISD::SETCC is always legalized to i8.
DebugLoc dl = N->getDebugLoc();
SDValue N0 = N->getOperand(0);
EVT VT = N->getValueType(0);
EVT OpVT = N0.getValueType();
if (N0.getOpcode() == ISD::AND &&
N0.hasOneUse() &&
N0.getOperand(0).hasOneUse()) {
SDValue N00 = N0.getOperand(0);
if (N00.getOpcode() != X86ISD::SETCC_CARRY)
return SDValue();
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N0.getOperand(1));
if (!C || C->getZExtValue() != 1)
return SDValue();
return DAG.getNode(ISD::AND, dl, VT,
DAG.getNode(X86ISD::SETCC_CARRY, dl, VT,
N00.getOperand(0), N00.getOperand(1)),
DAG.getConstant(1, VT));
}
// Optimize vectors in AVX mode:
//
// v8i16 -> v8i32
// Use vpunpcklwd for 4 lower elements v8i16 -> v4i32.
// Use vpunpckhwd for 4 upper elements v8i16 -> v4i32.
// Concat upper and lower parts.
//
// v4i32 -> v4i64
// Use vpunpckldq for 4 lower elements v4i32 -> v2i64.
// Use vpunpckhdq for 4 upper elements v4i32 -> v2i64.
// Concat upper and lower parts.
//
if (!DCI.isBeforeLegalizeOps())
return SDValue();
if (!Subtarget->hasAVX())
return SDValue();
if (((VT == MVT::v8i32) && (OpVT == MVT::v8i16)) ||
((VT == MVT::v4i64) && (OpVT == MVT::v4i32))) {
if (Subtarget->hasAVX2())
return DAG.getNode(X86ISD::VZEXT_MOVL, dl, VT, N0);
SDValue ZeroVec = getZeroVector(OpVT, Subtarget, DAG, dl);
SDValue OpLo = getUnpackl(DAG, dl, OpVT, N0, ZeroVec);
SDValue OpHi = getUnpackh(DAG, dl, OpVT, N0, ZeroVec);
EVT HVT = EVT::getVectorVT(*DAG.getContext(), VT.getVectorElementType(),
VT.getVectorNumElements()/2);
OpLo = DAG.getNode(ISD::BITCAST, dl, HVT, OpLo);
OpHi = DAG.getNode(ISD::BITCAST, dl, HVT, OpHi);
return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, OpLo, OpHi);
}
return SDValue();
}
// Optimize x == -y --> x+y == 0
// x != -y --> x+y != 0
static SDValue PerformISDSETCCCombine(SDNode *N, SelectionDAG &DAG) {
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
if ((CC == ISD::SETNE || CC == ISD::SETEQ) && LHS.getOpcode() == ISD::SUB)
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(LHS.getOperand(0)))
if (C->getAPIntValue() == 0 && LHS.hasOneUse()) {
SDValue addV = DAG.getNode(ISD::ADD, N->getDebugLoc(),
LHS.getValueType(), RHS, LHS.getOperand(1));
return DAG.getSetCC(N->getDebugLoc(), N->getValueType(0),
addV, DAG.getConstant(0, addV.getValueType()), CC);
}
if ((CC == ISD::SETNE || CC == ISD::SETEQ) && RHS.getOpcode() == ISD::SUB)
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS.getOperand(0)))
if (C->getAPIntValue() == 0 && RHS.hasOneUse()) {
SDValue addV = DAG.getNode(ISD::ADD, N->getDebugLoc(),
RHS.getValueType(), LHS, RHS.getOperand(1));
return DAG.getSetCC(N->getDebugLoc(), N->getValueType(0),
addV, DAG.getConstant(0, addV.getValueType()), CC);
}
return SDValue();
}
// Optimize RES = X86ISD::SETCC CONDCODE, EFLAG_INPUT
static SDValue PerformSETCCCombine(SDNode *N, SelectionDAG &DAG) {
unsigned X86CC = N->getConstantOperandVal(0);
SDValue EFLAG = N->getOperand(1);
DebugLoc DL = N->getDebugLoc();
// Materialize "setb reg" as "sbb reg,reg", since it can be extended without
// a zext and produces an all-ones bit which is more useful than 0/1 in some
// cases.
if (X86CC == X86::COND_B)
return DAG.getNode(ISD::AND, DL, MVT::i8,
DAG.getNode(X86ISD::SETCC_CARRY, DL, MVT::i8,
DAG.getConstant(X86CC, MVT::i8), EFLAG),
DAG.getConstant(1, MVT::i8));
return SDValue();
}
static SDValue PerformUINT_TO_FPCombine(SDNode *N, SelectionDAG &DAG) {
SDValue Op0 = N->getOperand(0);
EVT InVT = Op0->getValueType(0);
// UINT_TO_FP(v4i8) -> SINT_TO_FP(ZEXT(v4i8 to v4i32))
if (InVT == MVT::v8i8 || InVT == MVT::v4i8) {
DebugLoc dl = N->getDebugLoc();
MVT DstVT = InVT == MVT::v4i8 ? MVT::v4i32 : MVT::v8i32;
SDValue P = DAG.getNode(ISD::ZERO_EXTEND, dl, DstVT, Op0);
// Notice that we use SINT_TO_FP because we know that the high bits
// are zero and SINT_TO_FP is better supported by the hardware.
return DAG.getNode(ISD::SINT_TO_FP, dl, N->getValueType(0), P);
}
return SDValue();
}
static SDValue PerformSINT_TO_FPCombine(SDNode *N, SelectionDAG &DAG,
const X86TargetLowering *XTLI) {
SDValue Op0 = N->getOperand(0);
EVT InVT = Op0->getValueType(0);
// SINT_TO_FP(v4i8) -> SINT_TO_FP(SEXT(v4i8 to v4i32))
if (InVT == MVT::v8i8 || InVT == MVT::v4i8) {
DebugLoc dl = N->getDebugLoc();
MVT DstVT = InVT == MVT::v4i8 ? MVT::v4i32 : MVT::v8i32;
SDValue P = DAG.getNode(ISD::SIGN_EXTEND, dl, DstVT, Op0);
return DAG.getNode(ISD::SINT_TO_FP, dl, N->getValueType(0), P);
}
// Transform (SINT_TO_FP (i64 ...)) into an x87 operation if we have
// a 32-bit target where SSE doesn't support i64->FP operations.
if (Op0.getOpcode() == ISD::LOAD) {
LoadSDNode *Ld = cast<LoadSDNode>(Op0.getNode());
EVT VT = Ld->getValueType(0);
if (!Ld->isVolatile() && !N->getValueType(0).isVector() &&
ISD::isNON_EXTLoad(Op0.getNode()) && Op0.hasOneUse() &&
!XTLI->getSubtarget()->is64Bit() &&
!DAG.getTargetLoweringInfo().isTypeLegal(VT)) {
SDValue FILDChain = XTLI->BuildFILD(SDValue(N, 0), Ld->getValueType(0),
Ld->getChain(), Op0, DAG);
DAG.ReplaceAllUsesOfValueWith(Op0.getValue(1), FILDChain.getValue(1));
return FILDChain;
}
}
return SDValue();
}
static SDValue PerformFP_TO_SINTCombine(SDNode *N, SelectionDAG &DAG) {
EVT VT = N->getValueType(0);
// v4i8 = FP_TO_SINT() -> v4i8 = TRUNCATE (V4i32 = FP_TO_SINT()
if (VT == MVT::v8i8 || VT == MVT::v4i8) {
DebugLoc dl = N->getDebugLoc();
MVT DstVT = VT == MVT::v4i8 ? MVT::v4i32 : MVT::v8i32;
SDValue I = DAG.getNode(ISD::FP_TO_SINT, dl, DstVT, N->getOperand(0));
return DAG.getNode(ISD::TRUNCATE, dl, VT, I);
}
return SDValue();
}
// Optimize RES, EFLAGS = X86ISD::ADC LHS, RHS, EFLAGS
static SDValue PerformADCCombine(SDNode *N, SelectionDAG &DAG,
X86TargetLowering::DAGCombinerInfo &DCI) {
// If the LHS and RHS of the ADC node are zero, then it can't overflow and
// the result is either zero or one (depending on the input carry bit).
// Strength reduce this down to a "set on carry" aka SETCC_CARRY&1.
if (X86::isZeroNode(N->getOperand(0)) &&
X86::isZeroNode(N->getOperand(1)) &&
// We don't have a good way to replace an EFLAGS use, so only do this when
// dead right now.
SDValue(N, 1).use_empty()) {
DebugLoc DL = N->getDebugLoc();
EVT VT = N->getValueType(0);
SDValue CarryOut = DAG.getConstant(0, N->getValueType(1));
SDValue Res1 = DAG.getNode(ISD::AND, DL, VT,
DAG.getNode(X86ISD::SETCC_CARRY, DL, VT,
DAG.getConstant(X86::COND_B,MVT::i8),
N->getOperand(2)),
DAG.getConstant(1, VT));
return DCI.CombineTo(N, Res1, CarryOut);
}
return SDValue();
}
// fold (add Y, (sete X, 0)) -> adc 0, Y
// (add Y, (setne X, 0)) -> sbb -1, Y
// (sub (sete X, 0), Y) -> sbb 0, Y
// (sub (setne X, 0), Y) -> adc -1, Y
static SDValue OptimizeConditionalInDecrement(SDNode *N, SelectionDAG &DAG) {
DebugLoc DL = N->getDebugLoc();
// Look through ZExts.
SDValue Ext = N->getOperand(N->getOpcode() == ISD::SUB ? 1 : 0);
if (Ext.getOpcode() != ISD::ZERO_EXTEND || !Ext.hasOneUse())
return SDValue();
SDValue SetCC = Ext.getOperand(0);
if (SetCC.getOpcode() != X86ISD::SETCC || !SetCC.hasOneUse())
return SDValue();
X86::CondCode CC = (X86::CondCode)SetCC.getConstantOperandVal(0);
if (CC != X86::COND_E && CC != X86::COND_NE)
return SDValue();
SDValue Cmp = SetCC.getOperand(1);
if (Cmp.getOpcode() != X86ISD::CMP || !Cmp.hasOneUse() ||
!X86::isZeroNode(Cmp.getOperand(1)) ||
!Cmp.getOperand(0).getValueType().isInteger())
return SDValue();
SDValue CmpOp0 = Cmp.getOperand(0);
SDValue NewCmp = DAG.getNode(X86ISD::CMP, DL, MVT::i32, CmpOp0,
DAG.getConstant(1, CmpOp0.getValueType()));
SDValue OtherVal = N->getOperand(N->getOpcode() == ISD::SUB ? 0 : 1);
if (CC == X86::COND_NE)
return DAG.getNode(N->getOpcode() == ISD::SUB ? X86ISD::ADC : X86ISD::SBB,
DL, OtherVal.getValueType(), OtherVal,
DAG.getConstant(-1ULL, OtherVal.getValueType()), NewCmp);
return DAG.getNode(N->getOpcode() == ISD::SUB ? X86ISD::SBB : X86ISD::ADC,
DL, OtherVal.getValueType(), OtherVal,
DAG.getConstant(0, OtherVal.getValueType()), NewCmp);
}
/// PerformADDCombine - Do target-specific dag combines on integer adds.
static SDValue PerformAddCombine(SDNode *N, SelectionDAG &DAG,
const X86Subtarget *Subtarget) {
EVT VT = N->getValueType(0);
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);
// Try to synthesize horizontal adds from adds of shuffles.
if (((Subtarget->hasSSSE3() && (VT == MVT::v8i16 || VT == MVT::v4i32)) ||
(Subtarget->hasAVX2() && (VT == MVT::v16i16 || VT == MVT::v8i32))) &&
isHorizontalBinOp(Op0, Op1, true))
return DAG.getNode(X86ISD::HADD, N->getDebugLoc(), VT, Op0, Op1);
return OptimizeConditionalInDecrement(N, DAG);
}
static SDValue PerformSubCombine(SDNode *N, SelectionDAG &DAG,
const X86Subtarget *Subtarget) {
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);
// X86 can't encode an immediate LHS of a sub. See if we can push the
// negation into a preceding instruction.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op0)) {
// If the RHS of the sub is a XOR with one use and a constant, invert the
// immediate. Then add one to the LHS of the sub so we can turn
// X-Y -> X+~Y+1, saving one register.
if (Op1->hasOneUse() && Op1.getOpcode() == ISD::XOR &&
isa<ConstantSDNode>(Op1.getOperand(1))) {
APInt XorC = cast<ConstantSDNode>(Op1.getOperand(1))->getAPIntValue();
EVT VT = Op0.getValueType();
SDValue NewXor = DAG.getNode(ISD::XOR, Op1.getDebugLoc(), VT,
Op1.getOperand(0),
DAG.getConstant(~XorC, VT));
return DAG.getNode(ISD::ADD, N->getDebugLoc(), VT, NewXor,
DAG.getConstant(C->getAPIntValue()+1, VT));
}
}
// Try to synthesize horizontal adds from adds of shuffles.
EVT VT = N->getValueType(0);
if (((Subtarget->hasSSSE3() && (VT == MVT::v8i16 || VT == MVT::v4i32)) ||
(Subtarget->hasAVX2() && (VT == MVT::v16i16 || VT == MVT::v8i32))) &&
isHorizontalBinOp(Op0, Op1, true))
return DAG.getNode(X86ISD::HSUB, N->getDebugLoc(), VT, Op0, Op1);
return OptimizeConditionalInDecrement(N, DAG);
}
SDValue X86TargetLowering::PerformDAGCombine(SDNode *N,
DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
switch (N->getOpcode()) {
default: break;
case ISD::EXTRACT_VECTOR_ELT:
return PerformEXTRACT_VECTOR_ELTCombine(N, DAG, DCI);
case ISD::VSELECT:
case ISD::SELECT: return PerformSELECTCombine(N, DAG, DCI, Subtarget);
case X86ISD::CMOV: return PerformCMOVCombine(N, DAG, DCI);
case ISD::ADD: return PerformAddCombine(N, DAG, Subtarget);
case ISD::SUB: return PerformSubCombine(N, DAG, Subtarget);
case X86ISD::ADC: return PerformADCCombine(N, DAG, DCI);
case ISD::MUL: return PerformMulCombine(N, DAG, DCI);
case ISD::SHL:
case ISD::SRA:
case ISD::SRL: return PerformShiftCombine(N, DAG, DCI, Subtarget);
case ISD::AND: return PerformAndCombine(N, DAG, DCI, Subtarget);
case ISD::OR: return PerformOrCombine(N, DAG, DCI, Subtarget);
case ISD::XOR: return PerformXorCombine(N, DAG, DCI, Subtarget);
case ISD::LOAD: return PerformLOADCombine(N, DAG, Subtarget);
case ISD::STORE: return PerformSTORECombine(N, DAG, Subtarget);
case ISD::UINT_TO_FP: return PerformUINT_TO_FPCombine(N, DAG);
case ISD::SINT_TO_FP: return PerformSINT_TO_FPCombine(N, DAG, this);
case ISD::FP_TO_SINT: return PerformFP_TO_SINTCombine(N, DAG);
case ISD::FADD: return PerformFADDCombine(N, DAG, Subtarget);
case ISD::FSUB: return PerformFSUBCombine(N, DAG, Subtarget);
case X86ISD::FXOR:
case X86ISD::FOR: return PerformFORCombine(N, DAG);
case X86ISD::FAND: return PerformFANDCombine(N, DAG);
case X86ISD::BT: return PerformBTCombine(N, DAG, DCI);
case X86ISD::VZEXT_MOVL: return PerformVZEXT_MOVLCombine(N, DAG);
case ISD::ANY_EXTEND:
case ISD::ZERO_EXTEND: return PerformZExtCombine(N, DAG, DCI, Subtarget);
case ISD::SIGN_EXTEND: return PerformSExtCombine(N, DAG, DCI, Subtarget);
case ISD::TRUNCATE: return PerformTruncateCombine(N, DAG, DCI);
case ISD::SETCC: return PerformISDSETCCCombine(N, DAG);
case X86ISD::SETCC: return PerformSETCCCombine(N, DAG);
case X86ISD::SHUFP: // Handle all target specific shuffles
case X86ISD::PALIGN:
case X86ISD::UNPCKH:
case X86ISD::UNPCKL:
case X86ISD::MOVHLPS:
case X86ISD::MOVLHPS:
case X86ISD::PSHUFD:
case X86ISD::PSHUFHW:
case X86ISD::PSHUFLW:
case X86ISD::MOVSS:
case X86ISD::MOVSD:
case X86ISD::VPERMILP:
case X86ISD::VPERM2X128:
case ISD::VECTOR_SHUFFLE: return PerformShuffleCombine(N, DAG, DCI,Subtarget);
}
return SDValue();
}
/// isTypeDesirableForOp - Return true if the target has native support for
/// the specified value type and it is 'desirable' to use the type for the
/// given node type. e.g. On x86 i16 is legal, but undesirable since i16
/// instruction encodings are longer and some i16 instructions are slow.
bool X86TargetLowering::isTypeDesirableForOp(unsigned Opc, EVT VT) const {
if (!isTypeLegal(VT))
return false;
if (VT != MVT::i16)
return true;
switch (Opc) {
default:
return true;
case ISD::LOAD:
case ISD::SIGN_EXTEND:
case ISD::ZERO_EXTEND:
case ISD::ANY_EXTEND:
case ISD::SHL:
case ISD::SRL:
case ISD::SUB:
case ISD::ADD:
case ISD::MUL:
case ISD::AND:
case ISD::OR:
case ISD::XOR:
return false;
}
}
/// IsDesirableToPromoteOp - This method query the target whether it is
/// beneficial for dag combiner to promote the specified node. If true, it
/// should return the desired promotion type by reference.
bool X86TargetLowering::IsDesirableToPromoteOp(SDValue Op, EVT &PVT) const {
EVT VT = Op.getValueType();
if (VT != MVT::i16)
return false;
bool Promote = false;
bool Commute = false;
switch (Op.getOpcode()) {
default: break;
case ISD::LOAD: {
LoadSDNode *LD = cast<LoadSDNode>(Op);
// If the non-extending load has a single use and it's not live out, then it
// might be folded.
if (LD->getExtensionType() == ISD::NON_EXTLOAD /*&&
Op.hasOneUse()*/) {
for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
UE = Op.getNode()->use_end(); UI != UE; ++UI) {
// The only case where we'd want to promote LOAD (rather then it being
// promoted as an operand is when it's only use is liveout.
if (UI->getOpcode() != ISD::CopyToReg)
return false;
}
}
Promote = true;
break;
}
case ISD::SIGN_EXTEND:
case ISD::ZERO_EXTEND:
case ISD::ANY_EXTEND:
Promote = true;
break;
case ISD::SHL:
case ISD::SRL: {
SDValue N0 = Op.getOperand(0);
// Look out for (store (shl (load), x)).
if (MayFoldLoad(N0) && MayFoldIntoStore(Op))
return false;
Promote = true;
break;
}
case ISD::ADD:
case ISD::MUL:
case ISD::AND:
case ISD::OR:
case ISD::XOR:
Commute = true;
// fallthrough
case ISD::SUB: {
SDValue N0 = Op.getOperand(0);
SDValue N1 = Op.getOperand(1);
if (!Commute && MayFoldLoad(N1))
return false;
// Avoid disabling potential load folding opportunities.
if (MayFoldLoad(N0) && (!isa<ConstantSDNode>(N1) || MayFoldIntoStore(Op)))
return false;
if (MayFoldLoad(N1) && (!isa<ConstantSDNode>(N0) || MayFoldIntoStore(Op)))
return false;
Promote = true;
}
}
PVT = MVT::i32;
return Promote;
}
//===----------------------------------------------------------------------===//
// X86 Inline Assembly Support
//===----------------------------------------------------------------------===//
namespace {
// Helper to match a string separated by whitespace.
bool matchAsmImpl(StringRef s, ArrayRef<const StringRef *> args) {
s = s.substr(s.find_first_not_of(" \t")); // Skip leading whitespace.
for (unsigned i = 0, e = args.size(); i != e; ++i) {
StringRef piece(*args[i]);
if (!s.startswith(piece)) // Check if the piece matches.
return false;
s = s.substr(piece.size());
StringRef::size_type pos = s.find_first_not_of(" \t");
if (pos == 0) // We matched a prefix.
return false;
s = s.substr(pos);
}
return s.empty();
}
const VariadicFunction1<bool, StringRef, StringRef, matchAsmImpl> matchAsm={};
}
bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
std::string AsmStr = IA->getAsmString();
IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
if (!Ty || Ty->getBitWidth() % 16 != 0)
return false;
// TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
SmallVector<StringRef, 4> AsmPieces;
SplitString(AsmStr, AsmPieces, ";\n");
switch (AsmPieces.size()) {
default: return false;
case 1:
// FIXME: this should verify that we are targeting a 486 or better. If not,
// we will turn this bswap into something that will be lowered to logical
// ops instead of emitting the bswap asm. For now, we don't support 486 or
// lower so don't worry about this.
// bswap $0
if (matchAsm(AsmPieces[0], "bswap", "$0") ||
matchAsm(AsmPieces[0], "bswapl", "$0") ||
matchAsm(AsmPieces[0], "bswapq", "$0") ||
matchAsm(AsmPieces[0], "bswap", "${0:q}") ||
matchAsm(AsmPieces[0], "bswapl", "${0:q}") ||
matchAsm(AsmPieces[0], "bswapq", "${0:q}")) {
// No need to check constraints, nothing other than the equivalent of
// "=r,0" would be valid here.
return IntrinsicLowering::LowerToByteSwap(CI);
}
// rorw $$8, ${0:w} --> llvm.bswap.i16
if (CI->getType()->isIntegerTy(16) &&
IA->getConstraintString().compare(0, 5, "=r,0,") == 0 &&
(matchAsm(AsmPieces[0], "rorw", "$$8,", "${0:w}") ||
matchAsm(AsmPieces[0], "rolw", "$$8,", "${0:w}"))) {
AsmPieces.clear();
const std::string &ConstraintsStr = IA->getConstraintString();
SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
std::sort(AsmPieces.begin(), AsmPieces.end());
if (AsmPieces.size() == 4 &&
AsmPieces[0] == "~{cc}" &&
AsmPieces[1] == "~{dirflag}" &&
AsmPieces[2] == "~{flags}" &&
AsmPieces[3] == "~{fpsr}")
return IntrinsicLowering::LowerToByteSwap(CI);
}
break;
case 3:
if (CI->getType()->isIntegerTy(32) &&
IA->getConstraintString().compare(0, 5, "=r,0,") == 0 &&
matchAsm(AsmPieces[0], "rorw", "$$8,", "${0:w}") &&
matchAsm(AsmPieces[1], "rorl", "$$16,", "$0") &&
matchAsm(AsmPieces[2], "rorw", "$$8,", "${0:w}")) {
AsmPieces.clear();
const std::string &ConstraintsStr = IA->getConstraintString();
SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
std::sort(AsmPieces.begin(), AsmPieces.end());
if (AsmPieces.size() == 4 &&
AsmPieces[0] == "~{cc}" &&
AsmPieces[1] == "~{dirflag}" &&
AsmPieces[2] == "~{flags}" &&
AsmPieces[3] == "~{fpsr}")
return IntrinsicLowering::LowerToByteSwap(CI);
}
if (CI->getType()->isIntegerTy(64)) {
InlineAsm::ConstraintInfoVector Constraints = IA->ParseConstraints();
if (Constraints.size() >= 2 &&
Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
// bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
if (matchAsm(AsmPieces[0], "bswap", "%eax") &&
matchAsm(AsmPieces[1], "bswap", "%edx") &&
matchAsm(AsmPieces[2], "xchgl", "%eax,", "%edx"))
return IntrinsicLowering::LowerToByteSwap(CI);
}
}
break;
}
return false;
}
/// getConstraintType - Given a constraint letter, return the type of
/// constraint it is for this target.
X86TargetLowering::ConstraintType
X86TargetLowering::getConstraintType(const std::string &Constraint) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
case 'R':
case 'q':
case 'Q':
case 'f':
case 't':
case 'u':
case 'y':
case 'x':
case 'Y':
case 'l':
return C_RegisterClass;
case 'a':
case 'b':
case 'c':
case 'd':
case 'S':
case 'D':
case 'A':
return C_Register;
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'G':
case 'C':
case 'e':
case 'Z':
return C_Other;
default:
break;
}
}
return TargetLowering::getConstraintType(Constraint);
}
/// Examine constraint type and operand type and determine a weight value.
/// This object must already have been set up with the operand type
/// and the current alternative constraint selected.
TargetLowering::ConstraintWeight
X86TargetLowering::getSingleConstraintMatchWeight(
AsmOperandInfo &info, const char *constraint) const {
ConstraintWeight weight = CW_Invalid;
Value *CallOperandVal = info.CallOperandVal;
// If we don't have a value, we can't do a match,
// but allow it at the lowest weight.
if (CallOperandVal == NULL)
return CW_Default;
Type *type = CallOperandVal->getType();
// Look at the constraint type.
switch (*constraint) {
default:
weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
case 'R':
case 'q':
case 'Q':
case 'a':
case 'b':
case 'c':
case 'd':
case 'S':
case 'D':
case 'A':
if (CallOperandVal->getType()->isIntegerTy())
weight = CW_SpecificReg;
break;
case 'f':
case 't':
case 'u':
if (type->isFloatingPointTy())
weight = CW_SpecificReg;
break;
case 'y':
if (type->isX86_MMXTy() && Subtarget->hasMMX())
weight = CW_SpecificReg;
break;
case 'x':
case 'Y':
if (((type->getPrimitiveSizeInBits() == 128) && Subtarget->hasSSE1()) ||
((type->getPrimitiveSizeInBits() == 256) && Subtarget->hasAVX()))
weight = CW_Register;
break;
case 'I':
if (ConstantInt *C = dyn_cast<ConstantInt>(info.CallOperandVal)) {
if (C->getZExtValue() <= 31)
weight = CW_Constant;
}
break;
case 'J':
if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
if (C->getZExtValue() <= 63)
weight = CW_Constant;
}
break;
case 'K':
if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
if ((C->getSExtValue() >= -0x80) && (C->getSExtValue() <= 0x7f))
weight = CW_Constant;
}
break;
case 'L':
if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
if ((C->getZExtValue() == 0xff) || (C->getZExtValue() == 0xffff))
weight = CW_Constant;
}
break;
case 'M':
if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
if (C->getZExtValue() <= 3)
weight = CW_Constant;
}
break;
case 'N':
if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
if (C->getZExtValue() <= 0xff)
weight = CW_Constant;
}
break;
case 'G':
case 'C':
if (dyn_cast<ConstantFP>(CallOperandVal)) {
weight = CW_Constant;
}
break;
case 'e':
if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
if ((C->getSExtValue() >= -0x80000000LL) &&
(C->getSExtValue() <= 0x7fffffffLL))
weight = CW_Constant;
}
break;
case 'Z':
if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
if (C->getZExtValue() <= 0xffffffff)
weight = CW_Constant;
}
break;
}
return weight;
}
/// LowerXConstraint - try to replace an X constraint, which matches anything,
/// with another that has more specific requirements based on the type of the
/// corresponding operand.
const char *X86TargetLowering::
LowerXConstraint(EVT ConstraintVT) const {
// FP X constraints get lowered to SSE1/2 registers if available, otherwise
// 'f' like normal targets.
if (ConstraintVT.isFloatingPoint()) {
if (Subtarget->hasSSE2())
return "Y";
if (Subtarget->hasSSE1())
return "x";
}
return TargetLowering::LowerXConstraint(ConstraintVT);
}
/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
/// vector. If it is invalid, don't add anything to Ops.
void X86TargetLowering::LowerAsmOperandForConstraint(SDValue Op,
std::string &Constraint,
std::vector<SDValue>&Ops,
SelectionDAG &DAG) const {
SDValue Result(0, 0);
// Only support length 1 constraints for now.
if (Constraint.length() > 1) return;
char ConstraintLetter = Constraint[0];
switch (ConstraintLetter) {
default: break;
case 'I':
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (C->getZExtValue() <= 31) {
Result = DAG.getTargetConstant(C->getZExtValue(), Op.getValueType());
break;
}
}
return;
case 'J':
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (C->getZExtValue() <= 63) {
Result = DAG.getTargetConstant(C->getZExtValue(), Op.getValueType());
break;
}
}
return;
case 'K':
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if ((int8_t)C->getSExtValue() == C->getSExtValue()) {
Result = DAG.getTargetConstant(C->getZExtValue(), Op.getValueType());
break;
}
}
return;
case 'N':
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (C->getZExtValue() <= 255) {
Result = DAG.getTargetConstant(C->getZExtValue(), Op.getValueType());
break;
}
}
return;
case 'e': {
// 32-bit signed value
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (ConstantInt::isValueValidForType(Type::getInt32Ty(*DAG.getContext()),
C->getSExtValue())) {
// Widen to 64 bits here to get it sign extended.
Result = DAG.getTargetConstant(C->getSExtValue(), MVT::i64);
break;
}
// FIXME gcc accepts some relocatable values here too, but only in certain
// memory models; it's complicated.
}
return;
}
case 'Z': {
// 32-bit unsigned value
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
if (ConstantInt::isValueValidForType(Type::getInt32Ty(*DAG.getContext()),
C->getZExtValue())) {
Result = DAG.getTargetConstant(C->getZExtValue(), Op.getValueType());
break;
}
}
// FIXME gcc accepts some relocatable values here too, but only in certain
// memory models; it's complicated.
return;
}
case 'i': {
// Literal immediates are always ok.
if (ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op)) {
// Widen to 64 bits here to get it sign extended.
Result = DAG.getTargetConstant(CST->getSExtValue(), MVT::i64);
break;
}
// In any sort of PIC mode addresses need to be computed at runtime by
// adding in a register or some sort of table lookup. These can't
// be used as immediates.
if (Subtarget->isPICStyleGOT() || Subtarget->isPICStyleStubPIC())
return;
// If we are in non-pic codegen mode, we allow the address of a global (with
// an optional displacement) to be used with 'i'.
GlobalAddressSDNode *GA = 0;
int64_t Offset = 0;
// Match either (GA), (GA+C), (GA+C1+C2), etc.
while (1) {
if ((GA = dyn_cast<GlobalAddressSDNode>(Op))) {
Offset += GA->getOffset();
break;
} else if (Op.getOpcode() == ISD::ADD) {
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
Offset += C->getZExtValue();
Op = Op.getOperand(0);
continue;
}
} else if (Op.getOpcode() == ISD::SUB) {
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
Offset += -C->getZExtValue();
Op = Op.getOperand(0);
continue;
}
}
// Otherwise, this isn't something we can handle, reject it.
return;
}
const GlobalValue *GV = GA->getGlobal();
// If we require an extra load to get this address, as in PIC mode, we
// can't accept it.
if (isGlobalStubReference(Subtarget->ClassifyGlobalReference(GV,
getTargetMachine())))
return;
Result = DAG.getTargetGlobalAddress(GV, Op.getDebugLoc(),
GA->getValueType(0), Offset);
break;
}
}
if (Result.getNode()) {
Ops.push_back(Result);
return;
}
return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
}
std::pair<unsigned, const TargetRegisterClass*>
X86TargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
EVT VT) const {
// First, see if this is a constraint that directly corresponds to an LLVM
// register class.
if (Constraint.size() == 1) {
// GCC Constraint Letters
switch (Constraint[0]) {
default: break;
// TODO: Slight differences here in allocation order and leaving
// RIP in the class. Do they matter any more here than they do
// in the normal allocation?
case 'q': // GENERAL_REGS in 64-bit mode, Q_REGS in 32-bit mode.
if (Subtarget->is64Bit()) {
if (VT == MVT::i32 || VT == MVT::f32)
return std::make_pair(0U, &X86::GR32RegClass);
if (VT == MVT::i16)
return std::make_pair(0U, &X86::GR16RegClass);
if (VT == MVT::i8 || VT == MVT::i1)
return std::make_pair(0U, &X86::GR8RegClass);
if (VT == MVT::i64 || VT == MVT::f64)
return std::make_pair(0U, &X86::GR64RegClass);
break;
}
// 32-bit fallthrough
case 'Q': // Q_REGS
if (VT == MVT::i32 || VT == MVT::f32)
return std::make_pair(0U, &X86::GR32_ABCDRegClass);
if (VT == MVT::i16)
return std::make_pair(0U, &X86::GR16_ABCDRegClass);
if (VT == MVT::i8 || VT == MVT::i1)
return std::make_pair(0U, &X86::GR8_ABCD_LRegClass);
if (VT == MVT::i64)
return std::make_pair(0U, &X86::GR64_ABCDRegClass);
break;
case 'r': // GENERAL_REGS
case 'l': // INDEX_REGS
if (VT == MVT::i8 || VT == MVT::i1)
return std::make_pair(0U, &X86::GR8RegClass);
if (VT == MVT::i16)
return std::make_pair(0U, &X86::GR16RegClass);
if (VT == MVT::i32 || VT == MVT::f32 || !Subtarget->is64Bit())
return std::make_pair(0U, &X86::GR32RegClass);
return std::make_pair(0U, &X86::GR64RegClass);
case 'R': // LEGACY_REGS
if (VT == MVT::i8 || VT == MVT::i1)
return std::make_pair(0U, &X86::GR8_NOREXRegClass);
if (VT == MVT::i16)
return std::make_pair(0U, &X86::GR16_NOREXRegClass);
if (VT == MVT::i32 || !Subtarget->is64Bit())
return std::make_pair(0U, &X86::GR32_NOREXRegClass);
return std::make_pair(0U, &X86::GR64_NOREXRegClass);
case 'f': // FP Stack registers.
// If SSE is enabled for this VT, use f80 to ensure the isel moves the
// value to the correct fpstack register class.
if (VT == MVT::f32 && !isScalarFPTypeInSSEReg(VT))
return std::make_pair(0U, &X86::RFP32RegClass);
if (VT == MVT::f64 && !isScalarFPTypeInSSEReg(VT))
return std::make_pair(0U, &X86::RFP64RegClass);
return std::make_pair(0U, &X86::RFP80RegClass);
case 'y': // MMX_REGS if MMX allowed.
if (!Subtarget->hasMMX()) break;
return std::make_pair(0U, &X86::VR64RegClass);
case 'Y': // SSE_REGS if SSE2 allowed
if (!Subtarget->hasSSE2()) break;
// FALL THROUGH.
case 'x': // SSE_REGS if SSE1 allowed or AVX_REGS if AVX allowed
if (!Subtarget->hasSSE1()) break;
switch (VT.getSimpleVT().SimpleTy) {
default: break;
// Scalar SSE types.
case MVT::f32:
case MVT::i32:
return std::make_pair(0U, &X86::FR32RegClass);
case MVT::f64:
case MVT::i64:
return std::make_pair(0U, &X86::FR64RegClass);
// Vector types.
case MVT::v16i8:
case MVT::v8i16:
case MVT::v4i32:
case MVT::v2i64:
case MVT::v4f32:
case MVT::v2f64:
return std::make_pair(0U, &X86::VR128RegClass);
// AVX types.
case MVT::v32i8:
case MVT::v16i16:
case MVT::v8i32:
case MVT::v4i64:
case MVT::v8f32:
case MVT::v4f64:
return std::make_pair(0U, &X86::VR256RegClass);
}
break;
}
}
// Use the default implementation in TargetLowering to convert the register
// constraint into a member of a register class.
std::pair<unsigned, const TargetRegisterClass*> Res;
Res = TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
// Not found as a standard register?
if (Res.second == 0) {
// Map st(0) -> st(7) -> ST0
if (Constraint.size() == 7 && Constraint[0] == '{' &&
tolower(Constraint[1]) == 's' &&
tolower(Constraint[2]) == 't' &&
Constraint[3] == '(' &&
(Constraint[4] >= '0' && Constraint[4] <= '7') &&
Constraint[5] == ')' &&
Constraint[6] == '}') {
Res.first = X86::ST0+Constraint[4]-'0';
Res.second = &X86::RFP80RegClass;
return Res;
}
// GCC allows "st(0)" to be called just plain "st".
if (StringRef("{st}").equals_lower(Constraint)) {
Res.first = X86::ST0;
Res.second = &X86::RFP80RegClass;
return Res;
}
// flags -> EFLAGS
if (StringRef("{flags}").equals_lower(Constraint)) {
Res.first = X86::EFLAGS;
Res.second = &X86::CCRRegClass;
return Res;
}
// 'A' means EAX + EDX.
if (Constraint == "A") {
Res.first = X86::EAX;
Res.second = &X86::GR32_ADRegClass;
return Res;
}
return Res;
}
// Otherwise, check to see if this is a register class of the wrong value
// type. For example, we want to map "{ax},i32" -> {eax}, we don't want it to
// turn into {ax},{dx}.
if (Res.second->hasType(VT))
return Res; // Correct type already, nothing to do.
// All of the single-register GCC register classes map their values onto
// 16-bit register pieces "ax","dx","cx","bx","si","di","bp","sp". If we
// really want an 8-bit or 32-bit register, map to the appropriate register
// class and return the appropriate register.
if (Res.second == &X86::GR16RegClass) {
if (VT == MVT::i8) {
unsigned DestReg = 0;
switch (Res.first) {
default: break;
case X86::AX: DestReg = X86::AL; break;
case X86::DX: DestReg = X86::DL; break;
case X86::CX: DestReg = X86::CL; break;
case X86::BX: DestReg = X86::BL; break;
}
if (DestReg) {
Res.first = DestReg;
Res.second = &X86::GR8RegClass;
}
} else if (VT == MVT::i32) {
unsigned DestReg = 0;
switch (Res.first) {
default: break;
case X86::AX: DestReg = X86::EAX; break;
case X86::DX: DestReg = X86::EDX; break;
case X86::CX: DestReg = X86::ECX; break;
case X86::BX: DestReg = X86::EBX; break;
case X86::SI: DestReg = X86::ESI; break;
case X86::DI: DestReg = X86::EDI; break;
case X86::BP: DestReg = X86::EBP; break;
case X86::SP: DestReg = X86::ESP; break;
}
if (DestReg) {
Res.first = DestReg;
Res.second = &X86::GR32RegClass;
}
} else if (VT == MVT::i64) {
unsigned DestReg = 0;
switch (Res.first) {
default: break;
case X86::AX: DestReg = X86::RAX; break;
case X86::DX: DestReg = X86::RDX; break;
case X86::CX: DestReg = X86::RCX; break;
case X86::BX: DestReg = X86::RBX; break;
case X86::SI: DestReg = X86::RSI; break;
case X86::DI: DestReg = X86::RDI; break;
case X86::BP: DestReg = X86::RBP; break;
case X86::SP: DestReg = X86::RSP; break;
}
if (DestReg) {
Res.first = DestReg;
Res.second = &X86::GR64RegClass;
}
}
} else if (Res.second == &X86::FR32RegClass ||
Res.second == &X86::FR64RegClass ||
Res.second == &X86::VR128RegClass) {
// Handle references to XMM physical registers that got mapped into the
// wrong class. This can happen with constraints like {xmm0} where the
// target independent register mapper will just pick the first match it can
// find, ignoring the required type.
if (VT == MVT::f32)
Res.second = &X86::FR32RegClass;
else if (VT == MVT::f64)
Res.second = &X86::FR64RegClass;
else if (X86::VR128RegClass.hasType(VT))
Res.second = &X86::VR128RegClass;
}
return Res;
}
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