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2f616bff7e
llvm-6502/lib/Target/PowerPC/PPCISelLowering.cpp
Jim Laskey 2f616bff7e This is a general clean up of the PowerPC ABI. Address several problems and 
bugs including making sure that the TOS links back to the previous frame,
that the maximum call frame size is not included twice when using frame
pointers, no longer growing the frame on calls, double storing of SP and
a cleaner/faster dynamic alloca.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31792 91177308-0d34-0410-b5e6-96231b3b80d8
2006-11-16 22:43:37 +00:00

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//===-- PPCISelLowering.cpp - PPC DAG Lowering Implementation -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the PPCISelLowering class.
//
//===----------------------------------------------------------------------===//
#include "PPCISelLowering.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCTargetMachine.h"
#include "PPCPerfectShuffle.h"
#include "llvm/ADT/VectorExtras.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/Intrinsics.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
static cl::opt<bool> EnablePPCPreinc("enable-ppc-preinc");
PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
: TargetLowering(TM), PPCSubTarget(*TM.getSubtargetImpl()) {
// Fold away setcc operations if possible.
setSetCCIsExpensive();
setPow2DivIsCheap();
// Use _setjmp/_longjmp instead of setjmp/longjmp.
setUseUnderscoreSetJmpLongJmp(true);
// Set up the register classes.
addRegisterClass(MVT::i32, PPC::GPRCRegisterClass);
addRegisterClass(MVT::f32, PPC::F4RCRegisterClass);
addRegisterClass(MVT::f64, PPC::F8RCRegisterClass);
// PowerPC has an i16 but no i8 (or i1) SEXTLOAD
setLoadXAction(ISD::SEXTLOAD, MVT::i1, Expand);
setLoadXAction(ISD::SEXTLOAD, MVT::i8, Expand);
// PowerPC does not have truncstore for i1.
setStoreXAction(MVT::i1, Promote);
// PowerPC has pre-inc load and store's.
setIndexedLoadAction(ISD::PRE_INC, MVT::i1, Legal);
setIndexedLoadAction(ISD::PRE_INC, MVT::i8, Legal);
setIndexedLoadAction(ISD::PRE_INC, MVT::i16, Legal);
setIndexedLoadAction(ISD::PRE_INC, MVT::i32, Legal);
setIndexedLoadAction(ISD::PRE_INC, MVT::i64, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i1, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i8, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i16, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i32, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i64, Legal);
setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
// PowerPC has no intrinsics for these particular operations
setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
setOperationAction(ISD::MEMSET, MVT::Other, Expand);
setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
// PowerPC has no SREM/UREM instructions
setOperationAction(ISD::SREM, MVT::i32, Expand);
setOperationAction(ISD::UREM, MVT::i32, Expand);
setOperationAction(ISD::SREM, MVT::i64, Expand);
setOperationAction(ISD::UREM, MVT::i64, Expand);
// We don't support sin/cos/sqrt/fmod
setOperationAction(ISD::FSIN , MVT::f64, Expand);
setOperationAction(ISD::FCOS , MVT::f64, Expand);
setOperationAction(ISD::FREM , MVT::f64, Expand);
setOperationAction(ISD::FSIN , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f32, Expand);
setOperationAction(ISD::FREM , MVT::f32, Expand);
// If we're enabling GP optimizations, use hardware square root
if (!TM.getSubtarget<PPCSubtarget>().hasFSQRT()) {
setOperationAction(ISD::FSQRT, MVT::f64, Expand);
setOperationAction(ISD::FSQRT, MVT::f32, Expand);
}
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
// PowerPC does not have BSWAP, CTPOP or CTTZ
setOperationAction(ISD::BSWAP, MVT::i32 , Expand);
setOperationAction(ISD::CTPOP, MVT::i32 , Expand);
setOperationAction(ISD::CTTZ , MVT::i32 , Expand);
setOperationAction(ISD::BSWAP, MVT::i64 , Expand);
setOperationAction(ISD::CTPOP, MVT::i64 , Expand);
setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
// PowerPC does not have ROTR
setOperationAction(ISD::ROTR, MVT::i32 , Expand);
// PowerPC does not have Select
setOperationAction(ISD::SELECT, MVT::i32, Expand);
setOperationAction(ISD::SELECT, MVT::i64, Expand);
setOperationAction(ISD::SELECT, MVT::f32, Expand);
setOperationAction(ISD::SELECT, MVT::f64, Expand);
// PowerPC wants to turn select_cc of FP into fsel when possible.
setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
// PowerPC wants to optimize integer setcc a bit
setOperationAction(ISD::SETCC, MVT::i32, Custom);
// PowerPC does not have BRCOND which requires SetCC
setOperationAction(ISD::BRCOND, MVT::Other, Expand);
setOperationAction(ISD::BR_JT, MVT::Other, Expand);
// PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
// PowerPC does not have [U|S]INT_TO_FP
setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
setOperationAction(ISD::BIT_CONVERT, MVT::i64, Expand);
setOperationAction(ISD::BIT_CONVERT, MVT::f64, Expand);
// We cannot sextinreg(i1). Expand to shifts.
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
// Support label based line numbers.
setOperationAction(ISD::LOCATION, MVT::Other, Expand);
setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
// FIXME - use subtarget debug flags
if (!TM.getSubtarget<PPCSubtarget>().isDarwin())
setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand);
// We want to legalize GlobalAddress and ConstantPool nodes into the
// appropriate instructions to materialize the address.
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
setOperationAction(ISD::JumpTable, MVT::i32, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
setOperationAction(ISD::JumpTable, MVT::i64, Custom);
// RET must be custom lowered, to meet ABI requirements
setOperationAction(ISD::RET , MVT::Other, Custom);
// VASTART needs to be custom lowered to use the VarArgsFrameIndex
setOperationAction(ISD::VASTART , MVT::Other, Custom);
// Use the default implementation.
setOperationAction(ISD::VAARG , MVT::Other, Expand);
setOperationAction(ISD::VACOPY , MVT::Other, Expand);
setOperationAction(ISD::VAEND , MVT::Other, Expand);
setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64 , Custom);
// We want to custom lower some of our intrinsics.
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
// They also have instructions for converting between i64 and fp.
setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
// FIXME: disable this lowered code. This generates 64-bit register values,
// and we don't model the fact that the top part is clobbered by calls. We
// need to flag these together so that the value isn't live across a call.
//setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
// To take advantage of the above i64 FP_TO_SINT, promote i32 FP_TO_UINT
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Promote);
} else {
// PowerPC does not have FP_TO_UINT on 32-bit implementations.
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
}
if (TM.getSubtarget<PPCSubtarget>().use64BitRegs()) {
// 64 bit PowerPC implementations can support i64 types directly
addRegisterClass(MVT::i64, PPC::G8RCRegisterClass);
// BUILD_PAIR can't be handled natively, and should be expanded to shl/or
setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
} else {
// 32 bit PowerPC wants to expand i64 shifts itself.
setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
}
if (TM.getSubtarget<PPCSubtarget>().hasAltivec()) {
// First set operation action for all vector types to expand. Then we
// will selectively turn on ones that can be effectively codegen'd.
for (unsigned VT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
VT != (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++VT) {
// add/sub are legal for all supported vector VT's.
setOperationAction(ISD::ADD , (MVT::ValueType)VT, Legal);
setOperationAction(ISD::SUB , (MVT::ValueType)VT, Legal);
// We promote all shuffles to v16i8.
setOperationAction(ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, Promote);
AddPromotedToType (ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, MVT::v16i8);
// We promote all non-typed operations to v4i32.
setOperationAction(ISD::AND , (MVT::ValueType)VT, Promote);
AddPromotedToType (ISD::AND , (MVT::ValueType)VT, MVT::v4i32);
setOperationAction(ISD::OR , (MVT::ValueType)VT, Promote);
AddPromotedToType (ISD::OR , (MVT::ValueType)VT, MVT::v4i32);
setOperationAction(ISD::XOR , (MVT::ValueType)VT, Promote);
AddPromotedToType (ISD::XOR , (MVT::ValueType)VT, MVT::v4i32);
setOperationAction(ISD::LOAD , (MVT::ValueType)VT, Promote);
AddPromotedToType (ISD::LOAD , (MVT::ValueType)VT, MVT::v4i32);
setOperationAction(ISD::SELECT, (MVT::ValueType)VT, Promote);
AddPromotedToType (ISD::SELECT, (MVT::ValueType)VT, MVT::v4i32);
setOperationAction(ISD::STORE, (MVT::ValueType)VT, Promote);
AddPromotedToType (ISD::STORE, (MVT::ValueType)VT, MVT::v4i32);
// No other operations are legal.
setOperationAction(ISD::MUL , (MVT::ValueType)VT, Expand);
setOperationAction(ISD::SDIV, (MVT::ValueType)VT, Expand);
setOperationAction(ISD::SREM, (MVT::ValueType)VT, Expand);
setOperationAction(ISD::UDIV, (MVT::ValueType)VT, Expand);
setOperationAction(ISD::UREM, (MVT::ValueType)VT, Expand);
setOperationAction(ISD::FDIV, (MVT::ValueType)VT, Expand);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, (MVT::ValueType)VT, Expand);
setOperationAction(ISD::INSERT_VECTOR_ELT, (MVT::ValueType)VT, Expand);
setOperationAction(ISD::BUILD_VECTOR, (MVT::ValueType)VT, Expand);
setOperationAction(ISD::SCALAR_TO_VECTOR, (MVT::ValueType)VT, Expand);
}
// We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
// with merges, splats, etc.
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
setOperationAction(ISD::AND , MVT::v4i32, Legal);
setOperationAction(ISD::OR , MVT::v4i32, Legal);
setOperationAction(ISD::XOR , MVT::v4i32, Legal);
setOperationAction(ISD::LOAD , MVT::v4i32, Legal);
setOperationAction(ISD::SELECT, MVT::v4i32, Expand);
setOperationAction(ISD::STORE , MVT::v4i32, Legal);
addRegisterClass(MVT::v4f32, PPC::VRRCRegisterClass);
addRegisterClass(MVT::v4i32, PPC::VRRCRegisterClass);
addRegisterClass(MVT::v8i16, PPC::VRRCRegisterClass);
addRegisterClass(MVT::v16i8, PPC::VRRCRegisterClass);
setOperationAction(ISD::MUL, MVT::v4f32, Legal);
setOperationAction(ISD::MUL, MVT::v4i32, Custom);
setOperationAction(ISD::MUL, MVT::v8i16, Custom);
setOperationAction(ISD::MUL, MVT::v16i8, Custom);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Custom);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v16i8, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v8i16, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
}
setSetCCResultType(MVT::i32);
setShiftAmountType(MVT::i32);
setSetCCResultContents(ZeroOrOneSetCCResult);
if (TM.getSubtarget<PPCSubtarget>().isPPC64())
setStackPointerRegisterToSaveRestore(PPC::X1);
else
setStackPointerRegisterToSaveRestore(PPC::R1);
// We have target-specific dag combine patterns for the following nodes:
setTargetDAGCombine(ISD::SINT_TO_FP);
setTargetDAGCombine(ISD::STORE);
setTargetDAGCombine(ISD::BR_CC);
setTargetDAGCombine(ISD::BSWAP);
computeRegisterProperties();
}
const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return 0;
case PPCISD::FSEL: return "PPCISD::FSEL";
case PPCISD::FCFID: return "PPCISD::FCFID";
case PPCISD::FCTIDZ: return "PPCISD::FCTIDZ";
case PPCISD::FCTIWZ: return "PPCISD::FCTIWZ";
case PPCISD::STFIWX: return "PPCISD::STFIWX";
case PPCISD::VMADDFP: return "PPCISD::VMADDFP";
case PPCISD::VNMSUBFP: return "PPCISD::VNMSUBFP";
case PPCISD::VPERM: return "PPCISD::VPERM";
case PPCISD::Hi: return "PPCISD::Hi";
case PPCISD::Lo: return "PPCISD::Lo";
case PPCISD::GlobalBaseReg: return "PPCISD::GlobalBaseReg";
case PPCISD::SRL: return "PPCISD::SRL";
case PPCISD::SRA: return "PPCISD::SRA";
case PPCISD::SHL: return "PPCISD::SHL";
case PPCISD::EXTSW_32: return "PPCISD::EXTSW_32";
case PPCISD::STD_32: return "PPCISD::STD_32";
case PPCISD::CALL: return "PPCISD::CALL";
case PPCISD::MTCTR: return "PPCISD::MTCTR";
case PPCISD::BCTRL: return "PPCISD::BCTRL";
case PPCISD::RET_FLAG: return "PPCISD::RET_FLAG";
case PPCISD::MFCR: return "PPCISD::MFCR";
case PPCISD::VCMP: return "PPCISD::VCMP";
case PPCISD::VCMPo: return "PPCISD::VCMPo";
case PPCISD::LBRX: return "PPCISD::LBRX";
case PPCISD::STBRX: return "PPCISD::STBRX";
case PPCISD::COND_BRANCH: return "PPCISD::COND_BRANCH";
}
}
//===----------------------------------------------------------------------===//
// Node matching predicates, for use by the tblgen matching code.
//===----------------------------------------------------------------------===//
/// isFloatingPointZero - Return true if this is 0.0 or -0.0.
static bool isFloatingPointZero(SDOperand Op) {
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
return CFP->isExactlyValue(-0.0) || CFP->isExactlyValue(0.0);
else if (ISD::isEXTLoad(Op.Val) || ISD::isNON_EXTLoad(Op.Val)) {
// Maybe this has already been legalized into the constant pool?
if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
return CFP->isExactlyValue(-0.0) || CFP->isExactlyValue(0.0);
}
return false;
}
/// isConstantOrUndef - Op is either an undef node or a ConstantSDNode. Return
/// true if Op is undef or if it matches the specified value.
static bool isConstantOrUndef(SDOperand Op, unsigned Val) {
return Op.getOpcode() == ISD::UNDEF ||
cast<ConstantSDNode>(Op)->getValue() == Val;
}
/// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUHUM instruction.
bool PPC::isVPKUHUMShuffleMask(SDNode *N, bool isUnary) {
if (!isUnary) {
for (unsigned i = 0; i != 16; ++i)
if (!isConstantOrUndef(N->getOperand(i), i*2+1))
return false;
} else {
for (unsigned i = 0; i != 8; ++i)
if (!isConstantOrUndef(N->getOperand(i), i*2+1) ||
!isConstantOrUndef(N->getOperand(i+8), i*2+1))
return false;
}
return true;
}
/// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUWUM instruction.
bool PPC::isVPKUWUMShuffleMask(SDNode *N, bool isUnary) {
if (!isUnary) {
for (unsigned i = 0; i != 16; i += 2)
if (!isConstantOrUndef(N->getOperand(i ), i*2+2) ||
!isConstantOrUndef(N->getOperand(i+1), i*2+3))
return false;
} else {
for (unsigned i = 0; i != 8; i += 2)
if (!isConstantOrUndef(N->getOperand(i ), i*2+2) ||
!isConstantOrUndef(N->getOperand(i+1), i*2+3) ||
!isConstantOrUndef(N->getOperand(i+8), i*2+2) ||
!isConstantOrUndef(N->getOperand(i+9), i*2+3))
return false;
}
return true;
}
/// isVMerge - Common function, used to match vmrg* shuffles.
///
static bool isVMerge(SDNode *N, unsigned UnitSize,
unsigned LHSStart, unsigned RHSStart) {
assert(N->getOpcode() == ISD::BUILD_VECTOR &&
N->getNumOperands() == 16 && "PPC only supports shuffles by bytes!");
assert((UnitSize == 1 || UnitSize == 2 || UnitSize == 4) &&
"Unsupported merge size!");
for (unsigned i = 0; i != 8/UnitSize; ++i) // Step over units
for (unsigned j = 0; j != UnitSize; ++j) { // Step over bytes within unit
if (!isConstantOrUndef(N->getOperand(i*UnitSize*2+j),
LHSStart+j+i*UnitSize) ||
!isConstantOrUndef(N->getOperand(i*UnitSize*2+UnitSize+j),
RHSStart+j+i*UnitSize))
return false;
}
return true;
}
/// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
/// a VRGL* instruction with the specified unit size (1,2 or 4 bytes).
bool PPC::isVMRGLShuffleMask(SDNode *N, unsigned UnitSize, bool isUnary) {
if (!isUnary)
return isVMerge(N, UnitSize, 8, 24);
return isVMerge(N, UnitSize, 8, 8);
}
/// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
/// a VRGH* instruction with the specified unit size (1,2 or 4 bytes).
bool PPC::isVMRGHShuffleMask(SDNode *N, unsigned UnitSize, bool isUnary) {
if (!isUnary)
return isVMerge(N, UnitSize, 0, 16);
return isVMerge(N, UnitSize, 0, 0);
}
/// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift
/// amount, otherwise return -1.
int PPC::isVSLDOIShuffleMask(SDNode *N, bool isUnary) {
assert(N->getOpcode() == ISD::BUILD_VECTOR &&
N->getNumOperands() == 16 && "PPC only supports shuffles by bytes!");
// Find the first non-undef value in the shuffle mask.
unsigned i;
for (i = 0; i != 16 && N->getOperand(i).getOpcode() == ISD::UNDEF; ++i)
/*search*/;
if (i == 16) return -1; // all undef.
// Otherwise, check to see if the rest of the elements are consequtively
// numbered from this value.
unsigned ShiftAmt = cast<ConstantSDNode>(N->getOperand(i))->getValue();
if (ShiftAmt < i) return -1;
ShiftAmt -= i;
if (!isUnary) {
// Check the rest of the elements to see if they are consequtive.
for (++i; i != 16; ++i)
if (!isConstantOrUndef(N->getOperand(i), ShiftAmt+i))
return -1;
} else {
// Check the rest of the elements to see if they are consequtive.
for (++i; i != 16; ++i)
if (!isConstantOrUndef(N->getOperand(i), (ShiftAmt+i) & 15))
return -1;
}
return ShiftAmt;
}
/// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a splat of a single element that is suitable for input to
/// VSPLTB/VSPLTH/VSPLTW.
bool PPC::isSplatShuffleMask(SDNode *N, unsigned EltSize) {
assert(N->getOpcode() == ISD::BUILD_VECTOR &&
N->getNumOperands() == 16 &&
(EltSize == 1 || EltSize == 2 || EltSize == 4));
// This is a splat operation if each element of the permute is the same, and
// if the value doesn't reference the second vector.
unsigned ElementBase = 0;
SDOperand Elt = N->getOperand(0);
if (ConstantSDNode *EltV = dyn_cast<ConstantSDNode>(Elt))
ElementBase = EltV->getValue();
else
return false; // FIXME: Handle UNDEF elements too!
if (cast<ConstantSDNode>(Elt)->getValue() >= 16)
return false;
// Check that they are consequtive.
for (unsigned i = 1; i != EltSize; ++i) {
if (!isa<ConstantSDNode>(N->getOperand(i)) ||
cast<ConstantSDNode>(N->getOperand(i))->getValue() != i+ElementBase)
return false;
}
assert(isa<ConstantSDNode>(Elt) && "Invalid VECTOR_SHUFFLE mask!");
for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
assert(isa<ConstantSDNode>(N->getOperand(i)) &&
"Invalid VECTOR_SHUFFLE mask!");
for (unsigned j = 0; j != EltSize; ++j)
if (N->getOperand(i+j) != N->getOperand(j))
return false;
}
return true;
}
/// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
/// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
unsigned PPC::getVSPLTImmediate(SDNode *N, unsigned EltSize) {
assert(isSplatShuffleMask(N, EltSize));
return cast<ConstantSDNode>(N->getOperand(0))->getValue() / EltSize;
}
/// get_VSPLTI_elt - If this is a build_vector of constants which can be formed
/// by using a vspltis[bhw] instruction of the specified element size, return
/// the constant being splatted. The ByteSize field indicates the number of
/// bytes of each element [124] -> [bhw].
SDOperand PPC::get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
SDOperand OpVal(0, 0);
// If ByteSize of the splat is bigger than the element size of the
// build_vector, then we have a case where we are checking for a splat where
// multiple elements of the buildvector are folded together into a single
// logical element of the splat (e.g. "vsplish 1" to splat {0,1}*8).
unsigned EltSize = 16/N->getNumOperands();
if (EltSize < ByteSize) {
unsigned Multiple = ByteSize/EltSize; // Number of BV entries per spltval.
SDOperand UniquedVals[4];
assert(Multiple > 1 && Multiple <= 4 && "How can this happen?");
// See if all of the elements in the buildvector agree across.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
// If the element isn't a constant, bail fully out.
if (!isa<ConstantSDNode>(N->getOperand(i))) return SDOperand();
if (UniquedVals[i&(Multiple-1)].Val == 0)
UniquedVals[i&(Multiple-1)] = N->getOperand(i);
else if (UniquedVals[i&(Multiple-1)] != N->getOperand(i))
return SDOperand(); // no match.
}
// Okay, if we reached this point, UniquedVals[0..Multiple-1] contains
// either constant or undef values that are identical for each chunk. See
// if these chunks can form into a larger vspltis*.
// Check to see if all of the leading entries are either 0 or -1. If
// neither, then this won't fit into the immediate field.
bool LeadingZero = true;
bool LeadingOnes = true;
for (unsigned i = 0; i != Multiple-1; ++i) {
if (UniquedVals[i].Val == 0) continue; // Must have been undefs.
LeadingZero &= cast<ConstantSDNode>(UniquedVals[i])->isNullValue();
LeadingOnes &= cast<ConstantSDNode>(UniquedVals[i])->isAllOnesValue();
}
// Finally, check the least significant entry.
if (LeadingZero) {
if (UniquedVals[Multiple-1].Val == 0)
return DAG.getTargetConstant(0, MVT::i32); // 0,0,0,undef
int Val = cast<ConstantSDNode>(UniquedVals[Multiple-1])->getValue();
if (Val < 16)
return DAG.getTargetConstant(Val, MVT::i32); // 0,0,0,4 -> vspltisw(4)
}
if (LeadingOnes) {
if (UniquedVals[Multiple-1].Val == 0)
return DAG.getTargetConstant(~0U, MVT::i32); // -1,-1,-1,undef
int Val =cast<ConstantSDNode>(UniquedVals[Multiple-1])->getSignExtended();
if (Val >= -16) // -1,-1,-1,-2 -> vspltisw(-2)
return DAG.getTargetConstant(Val, MVT::i32);
}
return SDOperand();
}
// Check to see if this buildvec has a single non-undef value in its elements.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
if (OpVal.Val == 0)
OpVal = N->getOperand(i);
else if (OpVal != N->getOperand(i))
return SDOperand();
}
if (OpVal.Val == 0) return SDOperand(); // All UNDEF: use implicit def.
unsigned ValSizeInBytes = 0;
uint64_t Value = 0;
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
Value = CN->getValue();
ValSizeInBytes = MVT::getSizeInBits(CN->getValueType(0))/8;
} else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
assert(CN->getValueType(0) == MVT::f32 && "Only one legal FP vector type!");
Value = FloatToBits(CN->getValue());
ValSizeInBytes = 4;
}
// If the splat value is larger than the element value, then we can never do
// this splat. The only case that we could fit the replicated bits into our
// immediate field for would be zero, and we prefer to use vxor for it.
if (ValSizeInBytes < ByteSize) return SDOperand();
// If the element value is larger than the splat value, cut it in half and
// check to see if the two halves are equal. Continue doing this until we
// get to ByteSize. This allows us to handle 0x01010101 as 0x01.
while (ValSizeInBytes > ByteSize) {
ValSizeInBytes >>= 1;
// If the top half equals the bottom half, we're still ok.
if (((Value >> (ValSizeInBytes*8)) & ((1 << (8*ValSizeInBytes))-1)) !=
(Value & ((1 << (8*ValSizeInBytes))-1)))
return SDOperand();
}
// Properly sign extend the value.
int ShAmt = (4-ByteSize)*8;
int MaskVal = ((int)Value << ShAmt) >> ShAmt;
// If this is zero, don't match, zero matches ISD::isBuildVectorAllZeros.
if (MaskVal == 0) return SDOperand();
// Finally, if this value fits in a 5 bit sext field, return it
if (((MaskVal << (32-5)) >> (32-5)) == MaskVal)
return DAG.getTargetConstant(MaskVal, MVT::i32);
return SDOperand();
}
//===----------------------------------------------------------------------===//
// Addressing Mode Selection
//===----------------------------------------------------------------------===//
/// isIntS16Immediate - This method tests to see if the node is either a 32-bit
/// or 64-bit immediate, and if the value can be accurately represented as a
/// sign extension from a 16-bit value. If so, this returns true and the
/// immediate.
static bool isIntS16Immediate(SDNode *N, short &Imm) {
if (N->getOpcode() != ISD::Constant)
return false;
Imm = (short)cast<ConstantSDNode>(N)->getValue();
if (N->getValueType(0) == MVT::i32)
return Imm == (int32_t)cast<ConstantSDNode>(N)->getValue();
else
return Imm == (int64_t)cast<ConstantSDNode>(N)->getValue();
}
static bool isIntS16Immediate(SDOperand Op, short &Imm) {
return isIntS16Immediate(Op.Val, Imm);
}
/// SelectAddressRegReg - Given the specified addressed, check to see if it
/// can be represented as an indexed [r+r] operation. Returns false if it
/// can be more efficiently represented with [r+imm].
bool PPCTargetLowering::SelectAddressRegReg(SDOperand N, SDOperand &Base,
SDOperand &Index,
SelectionDAG &DAG) {
short imm = 0;
if (N.getOpcode() == ISD::ADD) {
if (isIntS16Immediate(N.getOperand(1), imm))
return false; // r+i
if (N.getOperand(1).getOpcode() == PPCISD::Lo)
return false; // r+i
Base = N.getOperand(0);
Index = N.getOperand(1);
return true;
} else if (N.getOpcode() == ISD::OR) {
if (isIntS16Immediate(N.getOperand(1), imm))
return false; // r+i can fold it if we can.
// If this is an or of disjoint bitfields, we can codegen this as an add
// (for better address arithmetic) if the LHS and RHS of the OR are provably
// disjoint.
uint64_t LHSKnownZero, LHSKnownOne;
uint64_t RHSKnownZero, RHSKnownOne;
ComputeMaskedBits(N.getOperand(0), ~0U, LHSKnownZero, LHSKnownOne);
if (LHSKnownZero) {
ComputeMaskedBits(N.getOperand(1), ~0U, RHSKnownZero, RHSKnownOne);
// If all of the bits are known zero on the LHS or RHS, the add won't
// carry.
if ((LHSKnownZero | RHSKnownZero) == ~0U) {
Base = N.getOperand(0);
Index = N.getOperand(1);
return true;
}
}
}
return false;
}
/// Returns true if the address N can be represented by a base register plus
/// a signed 16-bit displacement [r+imm], and if it is not better
/// represented as reg+reg.
bool PPCTargetLowering::SelectAddressRegImm(SDOperand N, SDOperand &Disp,
SDOperand &Base, SelectionDAG &DAG){
// If this can be more profitably realized as r+r, fail.
if (SelectAddressRegReg(N, Disp, Base, DAG))
return false;
if (N.getOpcode() == ISD::ADD) {
short imm = 0;
if (isIntS16Immediate(N.getOperand(1), imm)) {
Disp = DAG.getTargetConstant((int)imm & 0xFFFF, MVT::i32);
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
} else {
Base = N.getOperand(0);
}
return true; // [r+i]
} else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
// Match LOAD (ADD (X, Lo(G))).
assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getValue()
&& "Cannot handle constant offsets yet!");
Disp = N.getOperand(1).getOperand(0); // The global address.
assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
Disp.getOpcode() == ISD::TargetConstantPool ||
Disp.getOpcode() == ISD::TargetJumpTable);
Base = N.getOperand(0);
return true; // [&g+r]
}
} else if (N.getOpcode() == ISD::OR) {
short imm = 0;
if (isIntS16Immediate(N.getOperand(1), imm)) {
// If this is an or of disjoint bitfields, we can codegen this as an add
// (for better address arithmetic) if the LHS and RHS of the OR are
// provably disjoint.
uint64_t LHSKnownZero, LHSKnownOne;
ComputeMaskedBits(N.getOperand(0), ~0U, LHSKnownZero, LHSKnownOne);
if ((LHSKnownZero|~(unsigned)imm) == ~0U) {
// If all of the bits are known zero on the LHS or RHS, the add won't
// carry.
Base = N.getOperand(0);
Disp = DAG.getTargetConstant((int)imm & 0xFFFF, MVT::i32);
return true;
}
}
} else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
// Loading from a constant address.
// If this address fits entirely in a 16-bit sext immediate field, codegen
// this as "d, 0"
short Imm;
if (isIntS16Immediate(CN, Imm)) {
Disp = DAG.getTargetConstant(Imm, CN->getValueType(0));
Base = DAG.getRegister(PPC::R0, CN->getValueType(0));
return true;
}
// FIXME: Handle small sext constant offsets in PPC64 mode also!
if (CN->getValueType(0) == MVT::i32) {
int Addr = (int)CN->getValue();
// Otherwise, break this down into an LIS + disp.
Disp = DAG.getTargetConstant((short)Addr, MVT::i32);
Base = DAG.getConstant(Addr - (signed short)Addr, MVT::i32);
return true;
}
}
Disp = DAG.getTargetConstant(0, getPointerTy());
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
else
Base = N;
return true; // [r+0]
}
/// SelectAddressRegRegOnly - Given the specified addressed, force it to be
/// represented as an indexed [r+r] operation.
bool PPCTargetLowering::SelectAddressRegRegOnly(SDOperand N, SDOperand &Base,
SDOperand &Index,
SelectionDAG &DAG) {
// Check to see if we can easily represent this as an [r+r] address. This
// will fail if it thinks that the address is more profitably represented as
// reg+imm, e.g. where imm = 0.
if (SelectAddressRegReg(N, Base, Index, DAG))
return true;
// If the operand is an addition, always emit this as [r+r], since this is
// better (for code size, and execution, as the memop does the add for free)
// than emitting an explicit add.
if (N.getOpcode() == ISD::ADD) {
Base = N.getOperand(0);
Index = N.getOperand(1);
return true;
}
// Otherwise, do it the hard way, using R0 as the base register.
Base = DAG.getRegister(PPC::R0, N.getValueType());
Index = N;
return true;
}
/// SelectAddressRegImmShift - Returns true if the address N can be
/// represented by a base register plus a signed 14-bit displacement
/// [r+imm*4]. Suitable for use by STD and friends.
bool PPCTargetLowering::SelectAddressRegImmShift(SDOperand N, SDOperand &Disp,
SDOperand &Base,
SelectionDAG &DAG) {
// If this can be more profitably realized as r+r, fail.
if (SelectAddressRegReg(N, Disp, Base, DAG))
return false;
if (N.getOpcode() == ISD::ADD) {
short imm = 0;
if (isIntS16Immediate(N.getOperand(1), imm) && (imm & 3) == 0) {
Disp = DAG.getTargetConstant(((int)imm & 0xFFFF) >> 2, MVT::i32);
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
} else {
Base = N.getOperand(0);
}
return true; // [r+i]
} else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
// Match LOAD (ADD (X, Lo(G))).
assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getValue()
&& "Cannot handle constant offsets yet!");
Disp = N.getOperand(1).getOperand(0); // The global address.
assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
Disp.getOpcode() == ISD::TargetConstantPool ||
Disp.getOpcode() == ISD::TargetJumpTable);
Base = N.getOperand(0);
return true; // [&g+r]
}
} else if (N.getOpcode() == ISD::OR) {
short imm = 0;
if (isIntS16Immediate(N.getOperand(1), imm) && (imm & 3) == 0) {
// If this is an or of disjoint bitfields, we can codegen this as an add
// (for better address arithmetic) if the LHS and RHS of the OR are
// provably disjoint.
uint64_t LHSKnownZero, LHSKnownOne;
ComputeMaskedBits(N.getOperand(0), ~0U, LHSKnownZero, LHSKnownOne);
if ((LHSKnownZero|~(unsigned)imm) == ~0U) {
// If all of the bits are known zero on the LHS or RHS, the add won't
// carry.
Base = N.getOperand(0);
Disp = DAG.getTargetConstant(((int)imm & 0xFFFF) >> 2, MVT::i32);
return true;
}
}
} else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
// Loading from a constant address.
// If this address fits entirely in a 14-bit sext immediate field, codegen
// this as "d, 0"
short Imm;
if (isIntS16Immediate(CN, Imm)) {
Disp = DAG.getTargetConstant((unsigned short)Imm >> 2, getPointerTy());
Base = DAG.getRegister(PPC::R0, CN->getValueType(0));
return true;
}
// FIXME: Handle small sext constant offsets in PPC64 mode also!
if (CN->getValueType(0) == MVT::i32) {
int Addr = (int)CN->getValue();
// Otherwise, break this down into an LIS + disp.
Disp = DAG.getTargetConstant((short)Addr >> 2, MVT::i32);
Base = DAG.getConstant(Addr - (signed short)Addr, MVT::i32);
return true;
}
}
Disp = DAG.getTargetConstant(0, getPointerTy());
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
else
Base = N;
return true; // [r+0]
}
/// getPreIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if the node's address
/// can be legally represented as pre-indexed load / store address.
bool PPCTargetLowering::getPreIndexedAddressParts(SDNode *N, SDOperand &Base,
SDOperand &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) {
// Disabled by default for now.
if (!EnablePPCPreinc) return false;
SDOperand Ptr;
MVT::ValueType VT;
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
Ptr = LD->getBasePtr();
VT = LD->getLoadedVT();
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
ST = ST;
Ptr = ST->getBasePtr();
VT = ST->getStoredVT();
} else
return false;
// PowerPC doesn't have preinc load/store instructions for vectors.
if (MVT::isVector(VT))
return false;
// TODO: Check reg+reg first.
// LDU/STU use reg+imm*4, others use reg+imm.
if (VT != MVT::i64) {
// reg + imm
if (!SelectAddressRegImm(Ptr, Offset, Base, DAG))
return false;
} else {
// reg + imm * 4.
if (!SelectAddressRegImmShift(Ptr, Offset, Base, DAG))
return false;
}
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
// PPC64 doesn't have lwau, but it does have lwaux. Reject preinc load of
// sext i32 to i64 when addr mode is r+i.
if (LD->getValueType(0) == MVT::i64 && LD->getLoadedVT() == MVT::i32 &&
LD->getExtensionType() == ISD::SEXTLOAD &&
isa<ConstantSDNode>(Offset))
return false;
}
AM = ISD::PRE_INC;
return true;
}
//===----------------------------------------------------------------------===//
// LowerOperation implementation
//===----------------------------------------------------------------------===//
static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
MVT::ValueType PtrVT = Op.getValueType();
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
Constant *C = CP->getConstVal();
SDOperand CPI = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment());
SDOperand Zero = DAG.getConstant(0, PtrVT);
const TargetMachine &TM = DAG.getTarget();
SDOperand Hi = DAG.getNode(PPCISD::Hi, PtrVT, CPI, Zero);
SDOperand Lo = DAG.getNode(PPCISD::Lo, PtrVT, CPI, Zero);
// If this is a non-darwin platform, we don't support non-static relo models
// yet.
if (TM.getRelocationModel() == Reloc::Static ||
!TM.getSubtarget<PPCSubtarget>().isDarwin()) {
// Generate non-pic code that has direct accesses to the constant pool.
// The address of the global is just (hi(&g)+lo(&g)).
return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
}
if (TM.getRelocationModel() == Reloc::PIC_) {
// With PIC, the first instruction is actually "GR+hi(&G)".
Hi = DAG.getNode(ISD::ADD, PtrVT,
DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
}
Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
return Lo;
}
static SDOperand LowerJumpTable(SDOperand Op, SelectionDAG &DAG) {
MVT::ValueType PtrVT = Op.getValueType();
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
SDOperand JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
SDOperand Zero = DAG.getConstant(0, PtrVT);
const TargetMachine &TM = DAG.getTarget();
SDOperand Hi = DAG.getNode(PPCISD::Hi, PtrVT, JTI, Zero);
SDOperand Lo = DAG.getNode(PPCISD::Lo, PtrVT, JTI, Zero);
// If this is a non-darwin platform, we don't support non-static relo models
// yet.
if (TM.getRelocationModel() == Reloc::Static ||
!TM.getSubtarget<PPCSubtarget>().isDarwin()) {
// Generate non-pic code that has direct accesses to the constant pool.
// The address of the global is just (hi(&g)+lo(&g)).
return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
}
if (TM.getRelocationModel() == Reloc::PIC_) {
// With PIC, the first instruction is actually "GR+hi(&G)".
Hi = DAG.getNode(ISD::ADD, PtrVT,
DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
}
Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
return Lo;
}
static SDOperand LowerGlobalAddress(SDOperand Op, SelectionDAG &DAG) {
MVT::ValueType PtrVT = Op.getValueType();
GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
GlobalValue *GV = GSDN->getGlobal();
SDOperand GA = DAG.getTargetGlobalAddress(GV, PtrVT, GSDN->getOffset());
SDOperand Zero = DAG.getConstant(0, PtrVT);
const TargetMachine &TM = DAG.getTarget();
SDOperand Hi = DAG.getNode(PPCISD::Hi, PtrVT, GA, Zero);
SDOperand Lo = DAG.getNode(PPCISD::Lo, PtrVT, GA, Zero);
// If this is a non-darwin platform, we don't support non-static relo models
// yet.
if (TM.getRelocationModel() == Reloc::Static ||
!TM.getSubtarget<PPCSubtarget>().isDarwin()) {
// Generate non-pic code that has direct accesses to globals.
// The address of the global is just (hi(&g)+lo(&g)).
return DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
}
if (TM.getRelocationModel() == Reloc::PIC_) {
// With PIC, the first instruction is actually "GR+hi(&G)".
Hi = DAG.getNode(ISD::ADD, PtrVT,
DAG.getNode(PPCISD::GlobalBaseReg, PtrVT), Hi);
}
Lo = DAG.getNode(ISD::ADD, PtrVT, Hi, Lo);
if (!GV->hasWeakLinkage() && !GV->hasLinkOnceLinkage() &&
(!GV->isExternal() || GV->hasNotBeenReadFromBytecode()))
return Lo;
// If the global is weak or external, we have to go through the lazy
// resolution stub.
return DAG.getLoad(PtrVT, DAG.getEntryNode(), Lo, NULL, 0);
}
static SDOperand LowerSETCC(SDOperand Op, SelectionDAG &DAG) {
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
// If we're comparing for equality to zero, expose the fact that this is
// implented as a ctlz/srl pair on ppc, so that the dag combiner can
// fold the new nodes.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
if (C->isNullValue() && CC == ISD::SETEQ) {
MVT::ValueType VT = Op.getOperand(0).getValueType();
SDOperand Zext = Op.getOperand(0);
if (VT < MVT::i32) {
VT = MVT::i32;
Zext = DAG.getNode(ISD::ZERO_EXTEND, VT, Op.getOperand(0));
}
unsigned Log2b = Log2_32(MVT::getSizeInBits(VT));
SDOperand Clz = DAG.getNode(ISD::CTLZ, VT, Zext);
SDOperand Scc = DAG.getNode(ISD::SRL, VT, Clz,
DAG.getConstant(Log2b, MVT::i32));
return DAG.getNode(ISD::TRUNCATE, MVT::i32, Scc);
}
// Leave comparisons against 0 and -1 alone for now, since they're usually
// optimized. FIXME: revisit this when we can custom lower all setcc
// optimizations.
if (C->isAllOnesValue() || C->isNullValue())
return SDOperand();
}
// If we have an integer seteq/setne, turn it into a compare against zero
// by xor'ing the rhs with the lhs, which is faster than setting a
// condition register, reading it back out, and masking the correct bit. The
// normal approach here uses sub to do this instead of xor. Using xor exposes
// the result to other bit-twiddling opportunities.
MVT::ValueType LHSVT = Op.getOperand(0).getValueType();
if (MVT::isInteger(LHSVT) && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
MVT::ValueType VT = Op.getValueType();
SDOperand Sub = DAG.getNode(ISD::XOR, LHSVT, Op.getOperand(0),
Op.getOperand(1));
return DAG.getSetCC(VT, Sub, DAG.getConstant(0, LHSVT), CC);
}
return SDOperand();
}
static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
unsigned VarArgsFrameIndex) {
// vastart just stores the address of the VarArgsFrameIndex slot into the
// memory location argument.
MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV->getValue(),
SV->getOffset());
}
static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
int &VarArgsFrameIndex) {
// TODO: add description of PPC stack frame format, or at least some docs.
//
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
SSARegMap *RegMap = MF.getSSARegMap();
SmallVector<SDOperand, 8> ArgValues;
SDOperand Root = Op.getOperand(0);
MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
bool isPPC64 = PtrVT == MVT::i64;
unsigned ArgOffset = PPCFrameInfo::getLinkageSize(isPPC64);
static const unsigned GPR_32[] = { // 32-bit registers.
PPC::R3, PPC::R4, PPC::R5, PPC::R6,
PPC::R7, PPC::R8, PPC::R9, PPC::R10,
};
static const unsigned GPR_64[] = { // 64-bit registers.
PPC::X3, PPC::X4, PPC::X5, PPC::X6,
PPC::X7, PPC::X8, PPC::X9, PPC::X10,
};
static const unsigned FPR[] = {
PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
};
static const unsigned VR[] = {
PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
};
const unsigned Num_GPR_Regs = sizeof(GPR_32)/sizeof(GPR_32[0]);
const unsigned Num_FPR_Regs = sizeof(FPR)/sizeof(FPR[0]);
const unsigned Num_VR_Regs = sizeof( VR)/sizeof( VR[0]);
unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
const unsigned *GPR = isPPC64 ? GPR_64 : GPR_32;
// Add DAG nodes to load the arguments or copy them out of registers. On
// entry to a function on PPC, the arguments start after the linkage area,
// although the first ones are often in registers.
for (unsigned ArgNo = 0, e = Op.Val->getNumValues()-1; ArgNo != e; ++ArgNo) {
SDOperand ArgVal;
bool needsLoad = false;
MVT::ValueType ObjectVT = Op.getValue(ArgNo).getValueType();
unsigned ObjSize = MVT::getSizeInBits(ObjectVT)/8;
unsigned CurArgOffset = ArgOffset;
switch (ObjectVT) {
default: assert(0 && "Unhandled argument type!");
case MVT::i32:
// All int arguments reserve stack space.
ArgOffset += isPPC64 ? 8 : 4;
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
MF.addLiveIn(GPR[GPR_idx], VReg);
ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i32);
++GPR_idx;
} else {
needsLoad = true;
}
break;
case MVT::i64: // PPC64
// All int arguments reserve stack space.
ArgOffset += 8;
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = RegMap->createVirtualRegister(&PPC::G8RCRegClass);
MF.addLiveIn(GPR[GPR_idx], VReg);
ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i64);
++GPR_idx;
} else {
needsLoad = true;
}
break;
case MVT::f32:
case MVT::f64:
// All FP arguments reserve stack space.
ArgOffset += ObjSize;
// Every 4 bytes of argument space consumes one of the GPRs available for
// argument passing.
if (GPR_idx != Num_GPR_Regs) {
++GPR_idx;
if (ObjSize == 8 && GPR_idx != Num_GPR_Regs)
++GPR_idx;
}
if (FPR_idx != Num_FPR_Regs) {
unsigned VReg;
if (ObjectVT == MVT::f32)
VReg = RegMap->createVirtualRegister(&PPC::F4RCRegClass);
else
VReg = RegMap->createVirtualRegister(&PPC::F8RCRegClass);
MF.addLiveIn(FPR[FPR_idx], VReg);
ArgVal = DAG.getCopyFromReg(Root, VReg, ObjectVT);
++FPR_idx;
} else {
needsLoad = true;
}
break;
case MVT::v4f32:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
// Note that vector arguments in registers don't reserve stack space.
if (VR_idx != Num_VR_Regs) {
unsigned VReg = RegMap->createVirtualRegister(&PPC::VRRCRegClass);
MF.addLiveIn(VR[VR_idx], VReg);
ArgVal = DAG.getCopyFromReg(Root, VReg, ObjectVT);
++VR_idx;
} else {
// This should be simple, but requires getting 16-byte aligned stack
// values.
assert(0 && "Loading VR argument not implemented yet!");
needsLoad = true;
}
break;
}
// We need to load the argument to a virtual register if we determined above
// that we ran out of physical registers of the appropriate type
if (needsLoad) {
// If the argument is actually used, emit a load from the right stack
// slot.
if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
int FI = MFI->CreateFixedObject(ObjSize, CurArgOffset);
SDOperand FIN = DAG.getFrameIndex(FI, PtrVT);
ArgVal = DAG.getLoad(ObjectVT, Root, FIN, NULL, 0);
} else {
// Don't emit a dead load.
ArgVal = DAG.getNode(ISD::UNDEF, ObjectVT);
}
}
ArgValues.push_back(ArgVal);
}
// 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.
bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
if (isVarArg) {
VarArgsFrameIndex = MFI->CreateFixedObject(MVT::getSizeInBits(PtrVT)/8,
ArgOffset);
SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
// If this function is vararg, store any remaining integer argument regs
// to their spots on the stack so that they may be loaded by deferencing the
// result of va_next.
SmallVector<SDOperand, 8> MemOps;
for (; GPR_idx != Num_GPR_Regs; ++GPR_idx) {
unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
MF.addLiveIn(GPR[GPR_idx], VReg);
SDOperand Val = DAG.getCopyFromReg(Root, VReg, PtrVT);
SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
MemOps.push_back(Store);
// Increment the address by four for the next argument to store
SDOperand PtrOff = DAG.getConstant(MVT::getSizeInBits(PtrVT)/8, PtrVT);
FIN = DAG.getNode(ISD::ADD, PtrOff.getValueType(), FIN, PtrOff);
}
if (!MemOps.empty())
Root = DAG.getNode(ISD::TokenFactor, MVT::Other,&MemOps[0],MemOps.size());
}
ArgValues.push_back(Root);
// Return the new list of results.
std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
Op.Val->value_end());
return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
}
/// isCallCompatibleAddress - Return the immediate to use if the specified
/// 32-bit value is representable in the immediate field of a BxA instruction.
static SDNode *isBLACompatibleAddress(SDOperand Op, SelectionDAG &DAG) {
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
if (!C) return 0;
int Addr = C->getValue();
if ((Addr & 3) != 0 || // Low 2 bits are implicitly zero.
(Addr << 6 >> 6) != Addr)
return 0; // Top 6 bits have to be sext of immediate.
return DAG.getConstant((int)C->getValue() >> 2, MVT::i32).Val;
}
static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {
SDOperand Chain = Op.getOperand(0);
bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
SDOperand Callee = Op.getOperand(4);
unsigned NumOps = (Op.getNumOperands() - 5) / 2;
MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
bool isPPC64 = PtrVT == MVT::i64;
unsigned PtrByteSize = isPPC64 ? 8 : 4;
// args_to_use will accumulate outgoing args for the PPCISD::CALL case in
// SelectExpr to use to put the arguments in the appropriate registers.
std::vector<SDOperand> args_to_use;
// Count how many bytes are to be pushed on the stack, including the linkage
// area, and parameter passing area. We start with 24/48 bytes, which is
// prereserved space for [SP][CR][LR][3 x unused].
unsigned NumBytes = PPCFrameInfo::getLinkageSize(isPPC64);
// Add up all the space actually used.
for (unsigned i = 0; i != NumOps; ++i)
NumBytes += MVT::getSizeInBits(Op.getOperand(5+2*i).getValueType())/8;
// The prolog code of the callee may store up to 8 GPR argument registers to
// the stack, allowing va_start to index over them in memory if its varargs.
// Because we cannot tell if this is needed on the caller side, we have to
// conservatively assume that it is needed. As such, make sure we have at
// least enough stack space for the caller to store the 8 GPRs.
NumBytes = std::max(NumBytes, PPCFrameInfo::getMinCallFrameSize(isPPC64));
// Adjust the stack pointer for the new arguments...
// These operations are automatically eliminated by the prolog/epilog pass
Chain = DAG.getCALLSEQ_START(Chain,
DAG.getConstant(NumBytes, PtrVT));
// Set up a copy of the stack pointer for use loading and storing any
// arguments that may not fit in the registers available for argument
// passing.
SDOperand StackPtr;
if (isPPC64)
StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
else
StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
// Figure out which arguments are going to go in registers, and which in
// memory. Also, if this is a vararg function, floating point operations
// must be stored to our stack, and loaded into integer regs as well, if
// any integer regs are available for argument passing.
unsigned ArgOffset = PPCFrameInfo::getLinkageSize(isPPC64);
unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
static const unsigned GPR_32[] = { // 32-bit registers.
PPC::R3, PPC::R4, PPC::R5, PPC::R6,
PPC::R7, PPC::R8, PPC::R9, PPC::R10,
};
static const unsigned GPR_64[] = { // 64-bit registers.
PPC::X3, PPC::X4, PPC::X5, PPC::X6,
PPC::X7, PPC::X8, PPC::X9, PPC::X10,
};
static const unsigned FPR[] = {
PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
};
static const unsigned VR[] = {
PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
};
const unsigned NumGPRs = sizeof(GPR_32)/sizeof(GPR_32[0]);
const unsigned NumFPRs = sizeof(FPR)/sizeof(FPR[0]);
const unsigned NumVRs = sizeof( VR)/sizeof( VR[0]);
const unsigned *GPR = isPPC64 ? GPR_64 : GPR_32;
std::vector<std::pair<unsigned, SDOperand> > RegsToPass;
SmallVector<SDOperand, 8> MemOpChains;
for (unsigned i = 0; i != NumOps; ++i) {
SDOperand Arg = Op.getOperand(5+2*i);
// PtrOff will be used to store the current argument to the stack if a
// register cannot be found for it.
SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
PtrOff = DAG.getNode(ISD::ADD, PtrVT, StackPtr, PtrOff);
// On PPC64, promote integers to 64-bit values.
if (isPPC64 && Arg.getValueType() == MVT::i32) {
unsigned ExtOp = ISD::ZERO_EXTEND;
if (cast<ConstantSDNode>(Op.getOperand(5+2*i+1))->getValue())
ExtOp = ISD::SIGN_EXTEND;
Arg = DAG.getNode(ExtOp, MVT::i64, Arg);
}
switch (Arg.getValueType()) {
default: assert(0 && "Unexpected ValueType for argument!");
case MVT::i32:
case MVT::i64:
if (GPR_idx != NumGPRs) {
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Arg));
} else {
MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
}
ArgOffset += PtrByteSize;
break;
case MVT::f32:
case MVT::f64:
if (FPR_idx != NumFPRs) {
RegsToPass.push_back(std::make_pair(FPR[FPR_idx++], Arg));
if (isVarArg) {
SDOperand Store = DAG.getStore(Chain, Arg, PtrOff, NULL, 0);
MemOpChains.push_back(Store);
// Float varargs are always shadowed in available integer registers
if (GPR_idx != NumGPRs) {
SDOperand Load = DAG.getLoad(PtrVT, Store, PtrOff, NULL, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
}
if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64) {
SDOperand ConstFour = DAG.getConstant(4, PtrOff.getValueType());
PtrOff = DAG.getNode(ISD::ADD, PtrVT, PtrOff, ConstFour);
SDOperand Load = DAG.getLoad(PtrVT, Store, PtrOff, NULL, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
}
} else {
// If we have any FPRs remaining, we may also have GPRs remaining.
// Args passed in FPRs consume either 1 (f32) or 2 (f64) available
// GPRs.
if (GPR_idx != NumGPRs)
++GPR_idx;
if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 && !isPPC64)
++GPR_idx;
}
} else {
MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
}
if (isPPC64)
ArgOffset += 8;
else
ArgOffset += Arg.getValueType() == MVT::f32 ? 4 : 8;
break;
case MVT::v4f32:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
assert(!isVarArg && "Don't support passing vectors to varargs yet!");
assert(VR_idx != NumVRs &&
"Don't support passing more than 12 vector args yet!");
RegsToPass.push_back(std::make_pair(VR[VR_idx++], Arg));
break;
}
}
if (!MemOpChains.empty())
Chain = DAG.getNode(ISD::TokenFactor, 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 the appropriate regs.
SDOperand InFlag;
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
Chain = DAG.getCopyToReg(Chain, RegsToPass[i].first, RegsToPass[i].second,
InFlag);
InFlag = Chain.getValue(1);
}
std::vector<MVT::ValueType> NodeTys;
NodeTys.push_back(MVT::Other); // Returns a chain
NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
SmallVector<SDOperand, 8> Ops;
unsigned CallOpc = PPCISD::CALL;
// If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
// direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
// node so that legalize doesn't hack it.
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), Callee.getValueType());
else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), Callee.getValueType());
else if (SDNode *Dest = isBLACompatibleAddress(Callee, DAG))
// If this is an absolute destination address, use the munged value.
Callee = SDOperand(Dest, 0);
else {
// Otherwise, this is an indirect call. We have to use a MTCTR/BCTRL pair
// to do the call, we can't use PPCISD::CALL.
SDOperand MTCTROps[] = {Chain, Callee, InFlag};
Chain = DAG.getNode(PPCISD::MTCTR, NodeTys, MTCTROps, 2+(InFlag.Val!=0));
InFlag = Chain.getValue(1);
// Copy the callee address into R12 on darwin.
Chain = DAG.getCopyToReg(Chain, PPC::R12, Callee, InFlag);
InFlag = Chain.getValue(1);
NodeTys.clear();
NodeTys.push_back(MVT::Other);
NodeTys.push_back(MVT::Flag);
Ops.push_back(Chain);
CallOpc = PPCISD::BCTRL;
Callee.Val = 0;
}
// If this is a direct call, pass the chain and the callee.
if (Callee.Val) {
Ops.push_back(Chain);
Ops.push_back(Callee);
}
// 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()));
if (InFlag.Val)
Ops.push_back(InFlag);
Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
InFlag = Chain.getValue(1);
SDOperand ResultVals[3];
unsigned NumResults = 0;
NodeTys.clear();
// If the call has results, copy the values out of the ret val registers.
switch (Op.Val->getValueType(0)) {
default: assert(0 && "Unexpected ret value!");
case MVT::Other: break;
case MVT::i32:
if (Op.Val->getValueType(1) == MVT::i32) {
Chain = DAG.getCopyFromReg(Chain, PPC::R4, MVT::i32, InFlag).getValue(1);
ResultVals[0] = Chain.getValue(0);
Chain = DAG.getCopyFromReg(Chain, PPC::R3, MVT::i32,
Chain.getValue(2)).getValue(1);
ResultVals[1] = Chain.getValue(0);
NumResults = 2;
NodeTys.push_back(MVT::i32);
} else {
Chain = DAG.getCopyFromReg(Chain, PPC::R3, MVT::i32, InFlag).getValue(1);
ResultVals[0] = Chain.getValue(0);
NumResults = 1;
}
NodeTys.push_back(MVT::i32);
break;
case MVT::i64:
Chain = DAG.getCopyFromReg(Chain, PPC::X3, MVT::i64, InFlag).getValue(1);
ResultVals[0] = Chain.getValue(0);
NumResults = 1;
NodeTys.push_back(MVT::i64);
break;
case MVT::f32:
case MVT::f64:
Chain = DAG.getCopyFromReg(Chain, PPC::F1, Op.Val->getValueType(0),
InFlag).getValue(1);
ResultVals[0] = Chain.getValue(0);
NumResults = 1;
NodeTys.push_back(Op.Val->getValueType(0));
break;
case MVT::v4f32:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
Chain = DAG.getCopyFromReg(Chain, PPC::V2, Op.Val->getValueType(0),
InFlag).getValue(1);
ResultVals[0] = Chain.getValue(0);
NumResults = 1;
NodeTys.push_back(Op.Val->getValueType(0));
break;
}
Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
DAG.getConstant(NumBytes, PtrVT));
NodeTys.push_back(MVT::Other);
// If the function returns void, just return the chain.
if (NumResults == 0)
return Chain;
// Otherwise, merge everything together with a MERGE_VALUES node.
ResultVals[NumResults++] = Chain;
SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys,
ResultVals, NumResults);
return Res.getValue(Op.ResNo);
}
static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
SDOperand Copy;
switch(Op.getNumOperands()) {
default:
assert(0 && "Do not know how to return this many arguments!");
abort();
case 1:
return SDOperand(); // ret void is legal
case 3: {
MVT::ValueType ArgVT = Op.getOperand(1).getValueType();
unsigned ArgReg;
if (ArgVT == MVT::i32) {
ArgReg = PPC::R3;
} else if (ArgVT == MVT::i64) {
ArgReg = PPC::X3;
} else if (MVT::isVector(ArgVT)) {
ArgReg = PPC::V2;
} else {
assert(MVT::isFloatingPoint(ArgVT));
ArgReg = PPC::F1;
}
Copy = DAG.getCopyToReg(Op.getOperand(0), ArgReg, Op.getOperand(1),
SDOperand());
// If we haven't noted the R3/F1 are live out, do so now.
if (DAG.getMachineFunction().liveout_empty())
DAG.getMachineFunction().addLiveOut(ArgReg);
break;
}
case 5:
Copy = DAG.getCopyToReg(Op.getOperand(0), PPC::R3, Op.getOperand(3),
SDOperand());
Copy = DAG.getCopyToReg(Copy, PPC::R4, Op.getOperand(1),Copy.getValue(1));
// If we haven't noted the R3+R4 are live out, do so now.
if (DAG.getMachineFunction().liveout_empty()) {
DAG.getMachineFunction().addLiveOut(PPC::R3);
DAG.getMachineFunction().addLiveOut(PPC::R4);
}
break;
}
return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
}
static SDOperand LowerDYNAMIC_STACKALLOC(SDOperand Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) {
MachineFunction &MF = DAG.getMachineFunction();
bool IsPPC64 = Subtarget.isPPC64();
// Get current frame pointer save index. The users of this index will be
// primarily DYNALLOC instructions.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
int FPSI = FI->getFramePointerSaveIndex();
// If the frame pointer save index hasn't been defined yet.
if (!FPSI) {
// Find out what the fix offset of the frame pointer save area.
int Offset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64);
// Allocate the frame index for frame pointer save area.
FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, Offset);
// Save the result.
FI->setFramePointerSaveIndex(FPSI);
}
// Get the inputs.
SDOperand Chain = Op.getOperand(0);
SDOperand Size = Op.getOperand(1);
// Get the corect type for pointers.
MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
// Negate the size.
SDOperand NegSize = DAG.getNode(ISD::SUB, PtrVT,
DAG.getConstant(0, PtrVT), Size);
// Construct a node for the frame pointer save index.
SDOperand FPSIdx = DAG.getFrameIndex(FPSI, PtrVT);
// Build a DYNALLOC node.
SDOperand Ops[3] = { Chain, NegSize, FPSIdx };
SDVTList VTs = DAG.getVTList(PtrVT, MVT::Other);
return DAG.getNode(PPCISD::DYNALLOC, VTs, Ops, 3);
}
/// LowerSELECT_CC - Lower floating point select_cc's into fsel instruction when
/// possible.
static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
// Not FP? Not a fsel.
if (!MVT::isFloatingPoint(Op.getOperand(0).getValueType()) ||
!MVT::isFloatingPoint(Op.getOperand(2).getValueType()))
return SDOperand();
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
// Cannot handle SETEQ/SETNE.
if (CC == ISD::SETEQ || CC == ISD::SETNE) return SDOperand();
MVT::ValueType ResVT = Op.getValueType();
MVT::ValueType CmpVT = Op.getOperand(0).getValueType();
SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
SDOperand TV = Op.getOperand(2), FV = Op.getOperand(3);
// If the RHS of the comparison is a 0.0, we don't need to do the
// subtraction at all.
if (isFloatingPointZero(RHS))
switch (CC) {
default: break; // SETUO etc aren't handled by fsel.
case ISD::SETULT:
case ISD::SETOLT:
case ISD::SETLT:
std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
case ISD::SETUGE:
case ISD::SETOGE:
case ISD::SETGE:
if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
return DAG.getNode(PPCISD::FSEL, ResVT, LHS, TV, FV);
case ISD::SETUGT:
case ISD::SETOGT:
case ISD::SETGT:
std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
case ISD::SETULE:
case ISD::SETOLE:
case ISD::SETLE:
if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
LHS = DAG.getNode(ISD::FP_EXTEND, MVT::f64, LHS);
return DAG.getNode(PPCISD::FSEL, ResVT,
DAG.getNode(ISD::FNEG, MVT::f64, LHS), TV, FV);
}
SDOperand Cmp;
switch (CC) {
default: break; // SETUO etc aren't handled by fsel.
case ISD::SETULT:
case ISD::SETOLT:
case ISD::SETLT:
Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
case ISD::SETUGE:
case ISD::SETOGE:
case ISD::SETGE:
Cmp = DAG.getNode(ISD::FSUB, CmpVT, LHS, RHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
case ISD::SETUGT:
case ISD::SETOGT:
case ISD::SETGT:
Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, FV, TV);
case ISD::SETULE:
case ISD::SETOLE:
case ISD::SETLE:
Cmp = DAG.getNode(ISD::FSUB, CmpVT, RHS, LHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Cmp);
return DAG.getNode(PPCISD::FSEL, ResVT, Cmp, TV, FV);
}
return SDOperand();
}
static SDOperand LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
assert(MVT::isFloatingPoint(Op.getOperand(0).getValueType()));
SDOperand Src = Op.getOperand(0);
if (Src.getValueType() == MVT::f32)
Src = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Src);
SDOperand Tmp;
switch (Op.getValueType()) {
default: assert(0 && "Unhandled FP_TO_SINT type in custom expander!");
case MVT::i32:
Tmp = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Src);
break;
case MVT::i64:
Tmp = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Src);
break;
}
// Convert the FP value to an int value through memory.
SDOperand Bits = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Tmp);
if (Op.getValueType() == MVT::i32)
Bits = DAG.getNode(ISD::TRUNCATE, MVT::i32, Bits);
return Bits;
}
static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
if (Op.getOperand(0).getValueType() == MVT::i64) {
SDOperand Bits = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, Op.getOperand(0));
SDOperand FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Bits);
if (Op.getValueType() == MVT::f32)
FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP);
return FP;
}
assert(Op.getOperand(0).getValueType() == MVT::i32 &&
"Unhandled SINT_TO_FP type in custom expander!");
// Since we only generate this in 64-bit mode, we can take advantage of
// 64-bit registers. In particular, sign extend the input value into the
// 64-bit register with extsw, store the WHOLE 64-bit value into the stack
// then lfd it and fcfid it.
MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
int FrameIdx = FrameInfo->CreateStackObject(8, 8);
MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDOperand FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
SDOperand Ext64 = DAG.getNode(PPCISD::EXTSW_32, MVT::i32,
Op.getOperand(0));
// STD the extended value into the stack slot.
SDOperand Store = DAG.getNode(PPCISD::STD_32, MVT::Other,
DAG.getEntryNode(), Ext64, FIdx,
DAG.getSrcValue(NULL));
// Load the value as a double.
SDOperand Ld = DAG.getLoad(MVT::f64, Store, FIdx, NULL, 0);
// FCFID it and return it.
SDOperand FP = DAG.getNode(PPCISD::FCFID, MVT::f64, Ld);
if (Op.getValueType() == MVT::f32)
FP = DAG.getNode(ISD::FP_ROUND, MVT::f32, FP);
return FP;
}
static SDOperand LowerSHL_PARTS(SDOperand Op, SelectionDAG &DAG) {
assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 &&
Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SHL!");
// Expand into a bunch of logical ops. Note that these ops
// depend on the PPC behavior for oversized shift amounts.
SDOperand Lo = Op.getOperand(0);
SDOperand Hi = Op.getOperand(1);
SDOperand Amt = Op.getOperand(2);
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
DAG.getConstant(32, MVT::i32), Amt);
SDOperand Tmp2 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
DAG.getConstant(-32U, MVT::i32));
SDOperand Tmp6 = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Tmp5);
SDOperand OutHi = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
SDOperand OutLo = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Amt);
SDOperand OutOps[] = { OutLo, OutHi };
return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32),
OutOps, 2);
}
static SDOperand LowerSRL_PARTS(SDOperand Op, SelectionDAG &DAG) {
assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 &&
Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SRL!");
// Otherwise, expand into a bunch of logical ops. Note that these ops
// depend on the PPC behavior for oversized shift amounts.
SDOperand Lo = Op.getOperand(0);
SDOperand Hi = Op.getOperand(1);
SDOperand Amt = Op.getOperand(2);
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
DAG.getConstant(32, MVT::i32), Amt);
SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
DAG.getConstant(-32U, MVT::i32));
SDOperand Tmp6 = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Tmp5);
SDOperand OutLo = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
SDOperand OutHi = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Amt);
SDOperand OutOps[] = { OutLo, OutHi };
return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32),
OutOps, 2);
}
static SDOperand LowerSRA_PARTS(SDOperand Op, SelectionDAG &DAG) {
assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 &&
Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SRA!");
// Otherwise, expand into a bunch of logical ops, followed by a select_cc.
SDOperand Lo = Op.getOperand(0);
SDOperand Hi = Op.getOperand(1);
SDOperand Amt = Op.getOperand(2);
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
DAG.getConstant(32, MVT::i32), Amt);
SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
DAG.getConstant(-32U, MVT::i32));
SDOperand Tmp6 = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Tmp5);
SDOperand OutHi = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Amt);
SDOperand OutLo = DAG.getSelectCC(Tmp5, DAG.getConstant(0, MVT::i32),
Tmp4, Tmp6, ISD::SETLE);
SDOperand OutOps[] = { OutLo, OutHi };
return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32),
OutOps, 2);
}
//===----------------------------------------------------------------------===//
// Vector related lowering.
//
// If this is a vector of constants or undefs, get the bits. A bit in
// UndefBits is set if the corresponding element of the vector is an
// ISD::UNDEF value. For undefs, the corresponding VectorBits values are
// zero. Return true if this is not an array of constants, false if it is.
//
static bool GetConstantBuildVectorBits(SDNode *BV, uint64_t VectorBits[2],
uint64_t UndefBits[2]) {
// Start with zero'd results.
VectorBits[0] = VectorBits[1] = UndefBits[0] = UndefBits[1] = 0;
unsigned EltBitSize = MVT::getSizeInBits(BV->getOperand(0).getValueType());
for (unsigned i = 0, e = BV->getNumOperands(); i != e; ++i) {
SDOperand OpVal = BV->getOperand(i);
unsigned PartNo = i >= e/2; // In the upper 128 bits?
unsigned SlotNo = e/2 - (i & (e/2-1))-1; // Which subpiece of the uint64_t.
uint64_t EltBits = 0;
if (OpVal.getOpcode() == ISD::UNDEF) {
uint64_t EltUndefBits = ~0U >> (32-EltBitSize);
UndefBits[PartNo] |= EltUndefBits << (SlotNo*EltBitSize);
continue;
} else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
EltBits = CN->getValue() & (~0U >> (32-EltBitSize));
} else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
assert(CN->getValueType(0) == MVT::f32 &&
"Only one legal FP vector type!");
EltBits = FloatToBits(CN->getValue());
} else {
// Nonconstant element.
return true;
}
VectorBits[PartNo] |= EltBits << (SlotNo*EltBitSize);
}
//printf("%llx %llx %llx %llx\n",
// VectorBits[0], VectorBits[1], UndefBits[0], UndefBits[1]);
return false;
}
// If this is a splat (repetition) of a value across the whole vector, return
// the smallest size that splats it. For example, "0x01010101010101..." is a
// splat of 0x01, 0x0101, and 0x01010101. We return SplatBits = 0x01 and
// SplatSize = 1 byte.
static bool isConstantSplat(const uint64_t Bits128[2],
const uint64_t Undef128[2],
unsigned &SplatBits, unsigned &SplatUndef,
unsigned &SplatSize) {
// Don't let undefs prevent splats from matching. See if the top 64-bits are
// the same as the lower 64-bits, ignoring undefs.
if ((Bits128[0] & ~Undef128[1]) != (Bits128[1] & ~Undef128[0]))
return false; // Can't be a splat if two pieces don't match.
uint64_t Bits64 = Bits128[0] | Bits128[1];
uint64_t Undef64 = Undef128[0] & Undef128[1];
// Check that the top 32-bits are the same as the lower 32-bits, ignoring
// undefs.
if ((Bits64 & (~Undef64 >> 32)) != ((Bits64 >> 32) & ~Undef64))
return false; // Can't be a splat if two pieces don't match.
uint32_t Bits32 = uint32_t(Bits64) | uint32_t(Bits64 >> 32);
uint32_t Undef32 = uint32_t(Undef64) & uint32_t(Undef64 >> 32);
// If the top 16-bits are different than the lower 16-bits, ignoring
// undefs, we have an i32 splat.
if ((Bits32 & (~Undef32 >> 16)) != ((Bits32 >> 16) & ~Undef32)) {
SplatBits = Bits32;
SplatUndef = Undef32;
SplatSize = 4;
return true;
}
uint16_t Bits16 = uint16_t(Bits32) | uint16_t(Bits32 >> 16);
uint16_t Undef16 = uint16_t(Undef32) & uint16_t(Undef32 >> 16);
// If the top 8-bits are different than the lower 8-bits, ignoring
// undefs, we have an i16 splat.
if ((Bits16 & (uint16_t(~Undef16) >> 8)) != ((Bits16 >> 8) & ~Undef16)) {
SplatBits = Bits16;
SplatUndef = Undef16;
SplatSize = 2;
return true;
}
// Otherwise, we have an 8-bit splat.
SplatBits = uint8_t(Bits16) | uint8_t(Bits16 >> 8);
SplatUndef = uint8_t(Undef16) & uint8_t(Undef16 >> 8);
SplatSize = 1;
return true;
}
/// BuildSplatI - Build a canonical splati of Val with an element size of
/// SplatSize. Cast the result to VT.
static SDOperand BuildSplatI(int Val, unsigned SplatSize, MVT::ValueType VT,
SelectionDAG &DAG) {
assert(Val >= -16 && Val <= 15 && "vsplti is out of range!");
// Force vspltis[hw] -1 to vspltisb -1.
if (Val == -1) SplatSize = 1;
static const MVT::ValueType VTys[] = { // canonical VT to use for each size.
MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
};
MVT::ValueType CanonicalVT = VTys[SplatSize-1];
// Build a canonical splat for this value.
SDOperand Elt = DAG.getConstant(Val, MVT::getVectorBaseType(CanonicalVT));
SmallVector<SDOperand, 8> Ops;
Ops.assign(MVT::getVectorNumElements(CanonicalVT), Elt);
SDOperand Res = DAG.getNode(ISD::BUILD_VECTOR, CanonicalVT,
&Ops[0], Ops.size());
return DAG.getNode(ISD::BIT_CONVERT, VT, Res);
}
/// BuildIntrinsicOp - Return a binary operator intrinsic node with the
/// specified intrinsic ID.
static SDOperand BuildIntrinsicOp(unsigned IID, SDOperand LHS, SDOperand RHS,
SelectionDAG &DAG,
MVT::ValueType DestVT = MVT::Other) {
if (DestVT == MVT::Other) DestVT = LHS.getValueType();
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DestVT,
DAG.getConstant(IID, MVT::i32), LHS, RHS);
}
/// BuildIntrinsicOp - Return a ternary operator intrinsic node with the
/// specified intrinsic ID.
static SDOperand BuildIntrinsicOp(unsigned IID, SDOperand Op0, SDOperand Op1,
SDOperand Op2, SelectionDAG &DAG,
MVT::ValueType DestVT = MVT::Other) {
if (DestVT == MVT::Other) DestVT = Op0.getValueType();
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DestVT,
DAG.getConstant(IID, MVT::i32), Op0, Op1, Op2);
}
/// BuildVSLDOI - Return a VECTOR_SHUFFLE that is a vsldoi of the specified
/// amount. The result has the specified value type.
static SDOperand BuildVSLDOI(SDOperand LHS, SDOperand RHS, unsigned Amt,
MVT::ValueType VT, SelectionDAG &DAG) {
// Force LHS/RHS to be the right type.
LHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, LHS);
RHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, RHS);
SDOperand Ops[16];
for (unsigned i = 0; i != 16; ++i)
Ops[i] = DAG.getConstant(i+Amt, MVT::i32);
SDOperand T = DAG.getNode(ISD::VECTOR_SHUFFLE, MVT::v16i8, LHS, RHS,
DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops,16));
return DAG.getNode(ISD::BIT_CONVERT, VT, T);
}
// If this is a case we can't handle, return null and let the default
// expansion code take care of it. If we CAN select this case, and if it
// selects to a single instruction, return Op. Otherwise, if we can codegen
// this case more efficiently than a constant pool load, lower it to the
// sequence of ops that should be used.
static SDOperand LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
// If this is a vector of constants or undefs, get the bits. A bit in
// UndefBits is set if the corresponding element of the vector is an
// ISD::UNDEF value. For undefs, the corresponding VectorBits values are
// zero.
uint64_t VectorBits[2];
uint64_t UndefBits[2];
if (GetConstantBuildVectorBits(Op.Val, VectorBits, UndefBits))
return SDOperand(); // Not a constant vector.
// If this is a splat (repetition) of a value across the whole vector, return
// the smallest size that splats it. For example, "0x01010101010101..." is a
// splat of 0x01, 0x0101, and 0x01010101. We return SplatBits = 0x01 and
// SplatSize = 1 byte.
unsigned SplatBits, SplatUndef, SplatSize;
if (isConstantSplat(VectorBits, UndefBits, SplatBits, SplatUndef, SplatSize)){
bool HasAnyUndefs = (UndefBits[0] | UndefBits[1]) != 0;
// First, handle single instruction cases.
// All zeros?
if (SplatBits == 0) {
// Canonicalize all zero vectors to be v4i32.
if (Op.getValueType() != MVT::v4i32 || HasAnyUndefs) {
SDOperand Z = DAG.getConstant(0, MVT::i32);
Z = DAG.getNode(ISD::BUILD_VECTOR, MVT::v4i32, Z, Z, Z, Z);
Op = DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Z);
}
return Op;
}
// If the sign extended value is in the range [-16,15], use VSPLTI[bhw].
int32_t SextVal= int32_t(SplatBits << (32-8*SplatSize)) >> (32-8*SplatSize);
if (SextVal >= -16 && SextVal <= 15)
return BuildSplatI(SextVal, SplatSize, Op.getValueType(), DAG);
// Two instruction sequences.
// If this value is in the range [-32,30] and is even, use:
// tmp = VSPLTI[bhw], result = add tmp, tmp
if (SextVal >= -32 && SextVal <= 30 && (SextVal & 1) == 0) {
Op = BuildSplatI(SextVal >> 1, SplatSize, Op.getValueType(), DAG);
return DAG.getNode(ISD::ADD, Op.getValueType(), Op, Op);
}
// If this is 0x8000_0000 x 4, turn into vspltisw + vslw. If it is
// 0x7FFF_FFFF x 4, turn it into not(0x8000_0000). This is important
// for fneg/fabs.
if (SplatSize == 4 && SplatBits == (0x7FFFFFFF&~SplatUndef)) {
// Make -1 and vspltisw -1:
SDOperand OnesV = BuildSplatI(-1, 4, MVT::v4i32, DAG);
// Make the VSLW intrinsic, computing 0x8000_0000.
SDOperand Res = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, OnesV,
OnesV, DAG);
// xor by OnesV to invert it.
Res = DAG.getNode(ISD::XOR, MVT::v4i32, Res, OnesV);
return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
}
// Check to see if this is a wide variety of vsplti*, binop self cases.
unsigned SplatBitSize = SplatSize*8;
static const char SplatCsts[] = {
-1, 1, -2, 2, -3, 3, -4, 4, -5, 5, -6, 6, -7, 7,
-8, 8, -9, 9, -10, 10, -11, 11, -12, 12, -13, 13, 14, -14, 15, -15, -16
};
for (unsigned idx = 0; idx < sizeof(SplatCsts)/sizeof(SplatCsts[0]); ++idx){
// Indirect through the SplatCsts array so that we favor 'vsplti -1' for
// cases which are ambiguous (e.g. formation of 0x8000_0000). 'vsplti -1'
int i = SplatCsts[idx];
// Figure out what shift amount will be used by altivec if shifted by i in
// this splat size.
unsigned TypeShiftAmt = i & (SplatBitSize-1);
// vsplti + shl self.
if (SextVal == (i << (int)TypeShiftAmt)) {
Op = BuildSplatI(i, SplatSize, Op.getValueType(), DAG);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vslb, Intrinsic::ppc_altivec_vslh, 0,
Intrinsic::ppc_altivec_vslw
};
return BuildIntrinsicOp(IIDs[SplatSize-1], Op, Op, DAG);
}
// vsplti + srl self.
if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
Op = BuildSplatI(i, SplatSize, Op.getValueType(), DAG);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vsrb, Intrinsic::ppc_altivec_vsrh, 0,
Intrinsic::ppc_altivec_vsrw
};
return BuildIntrinsicOp(IIDs[SplatSize-1], Op, Op, DAG);
}
// vsplti + sra self.
if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
Op = BuildSplatI(i, SplatSize, Op.getValueType(), DAG);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vsrab, Intrinsic::ppc_altivec_vsrah, 0,
Intrinsic::ppc_altivec_vsraw
};
return BuildIntrinsicOp(IIDs[SplatSize-1], Op, Op, DAG);
}
// vsplti + rol self.
if (SextVal == (int)(((unsigned)i << TypeShiftAmt) |
((unsigned)i >> (SplatBitSize-TypeShiftAmt)))) {
Op = BuildSplatI(i, SplatSize, Op.getValueType(), DAG);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vrlb, Intrinsic::ppc_altivec_vrlh, 0,
Intrinsic::ppc_altivec_vrlw
};
return BuildIntrinsicOp(IIDs[SplatSize-1], Op, Op, DAG);
}
// t = vsplti c, result = vsldoi t, t, 1
if (SextVal == ((i << 8) | (i >> (TypeShiftAmt-8)))) {
SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
return BuildVSLDOI(T, T, 1, Op.getValueType(), DAG);
}
// t = vsplti c, result = vsldoi t, t, 2
if (SextVal == ((i << 16) | (i >> (TypeShiftAmt-16)))) {
SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
return BuildVSLDOI(T, T, 2, Op.getValueType(), DAG);
}
// t = vsplti c, result = vsldoi t, t, 3
if (SextVal == ((i << 24) | (i >> (TypeShiftAmt-24)))) {
SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
return BuildVSLDOI(T, T, 3, Op.getValueType(), DAG);
}
}
// Three instruction sequences.
// Odd, in range [17,31]: (vsplti C)-(vsplti -16).
if (SextVal >= 0 && SextVal <= 31) {
SDOperand LHS = BuildSplatI(SextVal-16, SplatSize, Op.getValueType(),DAG);
SDOperand RHS = BuildSplatI(-16, SplatSize, Op.getValueType(), DAG);
return DAG.getNode(ISD::SUB, Op.getValueType(), LHS, RHS);
}
// Odd, in range [-31,-17]: (vsplti C)+(vsplti -16).
if (SextVal >= -31 && SextVal <= 0) {
SDOperand LHS = BuildSplatI(SextVal+16, SplatSize, Op.getValueType(),DAG);
SDOperand RHS = BuildSplatI(-16, SplatSize, Op.getValueType(), DAG);
return DAG.getNode(ISD::ADD, Op.getValueType(), LHS, RHS);
}
}
return SDOperand();
}
/// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
/// the specified operations to build the shuffle.
static SDOperand GeneratePerfectShuffle(unsigned PFEntry, SDOperand LHS,
SDOperand RHS, SelectionDAG &DAG) {
unsigned OpNum = (PFEntry >> 26) & 0x0F;
unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
enum {
OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
OP_VMRGHW,
OP_VMRGLW,
OP_VSPLTISW0,
OP_VSPLTISW1,
OP_VSPLTISW2,
OP_VSPLTISW3,
OP_VSLDOI4,
OP_VSLDOI8,
OP_VSLDOI12
};
if (OpNum == OP_COPY) {
if (LHSID == (1*9+2)*9+3) return LHS;
assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
return RHS;
}
SDOperand OpLHS, OpRHS;
OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG);
OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG);
unsigned ShufIdxs[16];
switch (OpNum) {
default: assert(0 && "Unknown i32 permute!");
case OP_VMRGHW:
ShufIdxs[ 0] = 0; ShufIdxs[ 1] = 1; ShufIdxs[ 2] = 2; ShufIdxs[ 3] = 3;
ShufIdxs[ 4] = 16; ShufIdxs[ 5] = 17; ShufIdxs[ 6] = 18; ShufIdxs[ 7] = 19;
ShufIdxs[ 8] = 4; ShufIdxs[ 9] = 5; ShufIdxs[10] = 6; ShufIdxs[11] = 7;
ShufIdxs[12] = 20; ShufIdxs[13] = 21; ShufIdxs[14] = 22; ShufIdxs[15] = 23;
break;
case OP_VMRGLW:
ShufIdxs[ 0] = 8; ShufIdxs[ 1] = 9; ShufIdxs[ 2] = 10; ShufIdxs[ 3] = 11;
ShufIdxs[ 4] = 24; ShufIdxs[ 5] = 25; ShufIdxs[ 6] = 26; ShufIdxs[ 7] = 27;
ShufIdxs[ 8] = 12; ShufIdxs[ 9] = 13; ShufIdxs[10] = 14; ShufIdxs[11] = 15;
ShufIdxs[12] = 28; ShufIdxs[13] = 29; ShufIdxs[14] = 30; ShufIdxs[15] = 31;
break;
case OP_VSPLTISW0:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = (i&3)+0;
break;
case OP_VSPLTISW1:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = (i&3)+4;
break;
case OP_VSPLTISW2:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = (i&3)+8;
break;
case OP_VSPLTISW3:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = (i&3)+12;
break;
case OP_VSLDOI4:
return BuildVSLDOI(OpLHS, OpRHS, 4, OpLHS.getValueType(), DAG);
case OP_VSLDOI8:
return BuildVSLDOI(OpLHS, OpRHS, 8, OpLHS.getValueType(), DAG);
case OP_VSLDOI12:
return BuildVSLDOI(OpLHS, OpRHS, 12, OpLHS.getValueType(), DAG);
}
SDOperand Ops[16];
for (unsigned i = 0; i != 16; ++i)
Ops[i] = DAG.getConstant(ShufIdxs[i], MVT::i32);
return DAG.getNode(ISD::VECTOR_SHUFFLE, OpLHS.getValueType(), OpLHS, OpRHS,
DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops, 16));
}
/// LowerVECTOR_SHUFFLE - Return the code we lower for VECTOR_SHUFFLE. If this
/// is a shuffle we can handle in a single instruction, return it. Otherwise,
/// return the code it can be lowered into. Worst case, it can always be
/// lowered into a vperm.
static SDOperand LowerVECTOR_SHUFFLE(SDOperand Op, SelectionDAG &DAG) {
SDOperand V1 = Op.getOperand(0);
SDOperand V2 = Op.getOperand(1);
SDOperand PermMask = Op.getOperand(2);
// Cases that are handled by instructions that take permute immediates
// (such as vsplt*) should be left as VECTOR_SHUFFLE nodes so they can be
// selected by the instruction selector.
if (V2.getOpcode() == ISD::UNDEF) {
if (PPC::isSplatShuffleMask(PermMask.Val, 1) ||
PPC::isSplatShuffleMask(PermMask.Val, 2) ||
PPC::isSplatShuffleMask(PermMask.Val, 4) ||
PPC::isVPKUWUMShuffleMask(PermMask.Val, true) ||
PPC::isVPKUHUMShuffleMask(PermMask.Val, true) ||
PPC::isVSLDOIShuffleMask(PermMask.Val, true) != -1 ||
PPC::isVMRGLShuffleMask(PermMask.Val, 1, true) ||
PPC::isVMRGLShuffleMask(PermMask.Val, 2, true) ||
PPC::isVMRGLShuffleMask(PermMask.Val, 4, true) ||
PPC::isVMRGHShuffleMask(PermMask.Val, 1, true) ||
PPC::isVMRGHShuffleMask(PermMask.Val, 2, true) ||
PPC::isVMRGHShuffleMask(PermMask.Val, 4, true)) {
return Op;
}
}
// Altivec has a variety of "shuffle immediates" that take two vector inputs
// and produce a fixed permutation. If any of these match, do not lower to
// VPERM.
if (PPC::isVPKUWUMShuffleMask(PermMask.Val, false) ||
PPC::isVPKUHUMShuffleMask(PermMask.Val, false) ||
PPC::isVSLDOIShuffleMask(PermMask.Val, false) != -1 ||
PPC::isVMRGLShuffleMask(PermMask.Val, 1, false) ||
PPC::isVMRGLShuffleMask(PermMask.Val, 2, false) ||
PPC::isVMRGLShuffleMask(PermMask.Val, 4, false) ||
PPC::isVMRGHShuffleMask(PermMask.Val, 1, false) ||
PPC::isVMRGHShuffleMask(PermMask.Val, 2, false) ||
PPC::isVMRGHShuffleMask(PermMask.Val, 4, false))
return Op;
// Check to see if this is a shuffle of 4-byte values. If so, we can use our
// perfect shuffle table to emit an optimal matching sequence.
unsigned PFIndexes[4];
bool isFourElementShuffle = true;
for (unsigned i = 0; i != 4 && isFourElementShuffle; ++i) { // Element number
unsigned EltNo = 8; // Start out undef.
for (unsigned j = 0; j != 4; ++j) { // Intra-element byte.
if (PermMask.getOperand(i*4+j).getOpcode() == ISD::UNDEF)
continue; // Undef, ignore it.
unsigned ByteSource =
cast<ConstantSDNode>(PermMask.getOperand(i*4+j))->getValue();
if ((ByteSource & 3) != j) {
isFourElementShuffle = false;
break;
}
if (EltNo == 8) {
EltNo = ByteSource/4;
} else if (EltNo != ByteSource/4) {
isFourElementShuffle = false;
break;
}
}
PFIndexes[i] = EltNo;
}
// If this shuffle can be expressed as a shuffle of 4-byte elements, use the
// perfect shuffle vector to determine if it is cost effective to do this as
// discrete instructions, or whether we should use a vperm.
if (isFourElementShuffle) {
// Compute the index in the perfect shuffle table.
unsigned PFTableIndex =
PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
unsigned Cost = (PFEntry >> 30);
// Determining when to avoid vperm is tricky. Many things affect the cost
// of vperm, particularly how many times the perm mask needs to be computed.
// For example, if the perm mask can be hoisted out of a loop or is already
// used (perhaps because there are multiple permutes with the same shuffle
// mask?) the vperm has a cost of 1. OTOH, hoisting the permute mask out of
// the loop requires an extra register.
//
// As a compromise, we only emit discrete instructions if the shuffle can be
// generated in 3 or fewer operations. When we have loop information
// available, if this block is within a loop, we should avoid using vperm
// for 3-operation perms and use a constant pool load instead.
if (Cost < 3)
return GeneratePerfectShuffle(PFEntry, V1, V2, DAG);
}
// Lower this to a VPERM(V1, V2, V3) expression, where V3 is a constant
// vector that will get spilled to the constant pool.
if (V2.getOpcode() == ISD::UNDEF) V2 = V1;
// The SHUFFLE_VECTOR mask is almost exactly what we want for vperm, except
// that it is in input element units, not in bytes. Convert now.
MVT::ValueType EltVT = MVT::getVectorBaseType(V1.getValueType());
unsigned BytesPerElement = MVT::getSizeInBits(EltVT)/8;
SmallVector<SDOperand, 16> ResultMask;
for (unsigned i = 0, e = PermMask.getNumOperands(); i != e; ++i) {
unsigned SrcElt;
if (PermMask.getOperand(i).getOpcode() == ISD::UNDEF)
SrcElt = 0;
else
SrcElt = cast<ConstantSDNode>(PermMask.getOperand(i))->getValue();
for (unsigned j = 0; j != BytesPerElement; ++j)
ResultMask.push_back(DAG.getConstant(SrcElt*BytesPerElement+j,
MVT::i8));
}
SDOperand VPermMask = DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8,
&ResultMask[0], ResultMask.size());
return DAG.getNode(PPCISD::VPERM, V1.getValueType(), V1, V2, VPermMask);
}
/// getAltivecCompareInfo - Given an intrinsic, return false if it is not an
/// altivec comparison. If it is, return true and fill in Opc/isDot with
/// information about the intrinsic.
static bool getAltivecCompareInfo(SDOperand Intrin, int &CompareOpc,
bool &isDot) {
unsigned IntrinsicID = cast<ConstantSDNode>(Intrin.getOperand(0))->getValue();
CompareOpc = -1;
isDot = false;
switch (IntrinsicID) {
default: return false;
// Comparison predicates.
case Intrinsic::ppc_altivec_vcmpbfp_p: CompareOpc = 966; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpeqfp_p: CompareOpc = 198; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpequb_p: CompareOpc = 6; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpequh_p: CompareOpc = 70; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpequw_p: CompareOpc = 134; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgefp_p: CompareOpc = 454; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtfp_p: CompareOpc = 710; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtsb_p: CompareOpc = 774; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtsh_p: CompareOpc = 838; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtsw_p: CompareOpc = 902; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtub_p: CompareOpc = 518; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtuh_p: CompareOpc = 582; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtuw_p: CompareOpc = 646; isDot = 1; break;
// Normal Comparisons.
case Intrinsic::ppc_altivec_vcmpbfp: CompareOpc = 966; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpeqfp: CompareOpc = 198; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpequb: CompareOpc = 6; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpequh: CompareOpc = 70; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpequw: CompareOpc = 134; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgefp: CompareOpc = 454; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtfp: CompareOpc = 710; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtsb: CompareOpc = 774; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtsh: CompareOpc = 838; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtsw: CompareOpc = 902; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtub: CompareOpc = 518; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtuh: CompareOpc = 582; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtuw: CompareOpc = 646; isDot = 0; break;
}
return true;
}
/// LowerINTRINSIC_WO_CHAIN - If this is an intrinsic that we want to custom
/// lower, do it, otherwise return null.
static SDOperand LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG) {
// If this is a lowered altivec predicate compare, CompareOpc is set to the
// opcode number of the comparison.
int CompareOpc;
bool isDot;
if (!getAltivecCompareInfo(Op, CompareOpc, isDot))
return SDOperand(); // Don't custom lower most intrinsics.
// If this is a non-dot comparison, make the VCMP node and we are done.
if (!isDot) {
SDOperand Tmp = DAG.getNode(PPCISD::VCMP, Op.getOperand(2).getValueType(),
Op.getOperand(1), Op.getOperand(2),
DAG.getConstant(CompareOpc, MVT::i32));
return DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Tmp);
}
// Create the PPCISD altivec 'dot' comparison node.
SDOperand Ops[] = {
Op.getOperand(2), // LHS
Op.getOperand(3), // RHS
DAG.getConstant(CompareOpc, MVT::i32)
};
std::vector<MVT::ValueType> VTs;
VTs.push_back(Op.getOperand(2).getValueType());
VTs.push_back(MVT::Flag);
SDOperand CompNode = DAG.getNode(PPCISD::VCMPo, VTs, Ops, 3);
// Now that we have the comparison, emit a copy from the CR to a GPR.
// This is flagged to the above dot comparison.
SDOperand Flags = DAG.getNode(PPCISD::MFCR, MVT::i32,
DAG.getRegister(PPC::CR6, MVT::i32),
CompNode.getValue(1));
// Unpack the result based on how the target uses it.
unsigned BitNo; // Bit # of CR6.
bool InvertBit; // Invert result?
switch (cast<ConstantSDNode>(Op.getOperand(1))->getValue()) {
default: // Can't happen, don't crash on invalid number though.
case 0: // Return the value of the EQ bit of CR6.
BitNo = 0; InvertBit = false;
break;
case 1: // Return the inverted value of the EQ bit of CR6.
BitNo = 0; InvertBit = true;
break;
case 2: // Return the value of the LT bit of CR6.
BitNo = 2; InvertBit = false;
break;
case 3: // Return the inverted value of the LT bit of CR6.
BitNo = 2; InvertBit = true;
break;
}
// Shift the bit into the low position.
Flags = DAG.getNode(ISD::SRL, MVT::i32, Flags,
DAG.getConstant(8-(3-BitNo), MVT::i32));
// Isolate the bit.
Flags = DAG.getNode(ISD::AND, MVT::i32, Flags,
DAG.getConstant(1, MVT::i32));
// If we are supposed to, toggle the bit.
if (InvertBit)
Flags = DAG.getNode(ISD::XOR, MVT::i32, Flags,
DAG.getConstant(1, MVT::i32));
return Flags;
}
static SDOperand LowerSCALAR_TO_VECTOR(SDOperand Op, SelectionDAG &DAG) {
// Create a stack slot that is 16-byte aligned.
MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
int FrameIdx = FrameInfo->CreateStackObject(16, 16);
MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDOperand FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
// Store the input value into Value#0 of the stack slot.
SDOperand Store = DAG.getStore(DAG.getEntryNode(),
Op.getOperand(0), FIdx, NULL, 0);
// Load it out.
return DAG.getLoad(Op.getValueType(), Store, FIdx, NULL, 0);
}
static SDOperand LowerMUL(SDOperand Op, SelectionDAG &DAG) {
if (Op.getValueType() == MVT::v4i32) {
SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
SDOperand Zero = BuildSplatI( 0, 1, MVT::v4i32, DAG);
SDOperand Neg16 = BuildSplatI(-16, 4, MVT::v4i32, DAG); // +16 as shift amt.
SDOperand RHSSwap = // = vrlw RHS, 16
BuildIntrinsicOp(Intrinsic::ppc_altivec_vrlw, RHS, Neg16, DAG);
// Shrinkify inputs to v8i16.
LHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, LHS);
RHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, RHS);
RHSSwap = DAG.getNode(ISD::BIT_CONVERT, MVT::v8i16, RHSSwap);
// Low parts multiplied together, generating 32-bit results (we ignore the
// top parts).
SDOperand LoProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmulouh,
LHS, RHS, DAG, MVT::v4i32);
SDOperand HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmsumuhm,
LHS, RHSSwap, Zero, DAG, MVT::v4i32);
// Shift the high parts up 16 bits.
HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, HiProd, Neg16, DAG);
return DAG.getNode(ISD::ADD, MVT::v4i32, LoProd, HiProd);
} else if (Op.getValueType() == MVT::v8i16) {
SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
SDOperand Zero = BuildSplatI(0, 1, MVT::v8i16, DAG);
return BuildIntrinsicOp(Intrinsic::ppc_altivec_vmladduhm,
LHS, RHS, Zero, DAG);
} else if (Op.getValueType() == MVT::v16i8) {
SDOperand LHS = Op.getOperand(0), RHS = Op.getOperand(1);
// Multiply the even 8-bit parts, producing 16-bit sums.
SDOperand EvenParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuleub,
LHS, RHS, DAG, MVT::v8i16);
EvenParts = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, EvenParts);
// Multiply the odd 8-bit parts, producing 16-bit sums.
SDOperand OddParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuloub,
LHS, RHS, DAG, MVT::v8i16);
OddParts = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, OddParts);
// Merge the results together.
SDOperand Ops[16];
for (unsigned i = 0; i != 8; ++i) {
Ops[i*2 ] = DAG.getConstant(2*i+1, MVT::i8);
Ops[i*2+1] = DAG.getConstant(2*i+1+16, MVT::i8);
}
return DAG.getNode(ISD::VECTOR_SHUFFLE, MVT::v16i8, EvenParts, OddParts,
DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops, 16));
} else {
assert(0 && "Unknown mul to lower!");
abort();
}
}
/// LowerOperation - Provide custom lowering hooks for some operations.
///
SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
switch (Op.getOpcode()) {
default: assert(0 && "Wasn't expecting to be able to lower this!");
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
case ISD::JumpTable: return LowerJumpTable(Op, DAG);
case ISD::SETCC: return LowerSETCC(Op, DAG);
case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
case ISD::FORMAL_ARGUMENTS:
return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex);
case ISD::CALL: return LowerCALL(Op, DAG);
case ISD::RET: return LowerRET(Op, DAG);
case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG,
PPCSubTarget);
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
// Lower 64-bit shifts.
case ISD::SHL_PARTS: return LowerSHL_PARTS(Op, DAG);
case ISD::SRL_PARTS: return LowerSRL_PARTS(Op, DAG);
case ISD::SRA_PARTS: return LowerSRA_PARTS(Op, DAG);
// Vector-related lowering.
case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
case ISD::SCALAR_TO_VECTOR: return LowerSCALAR_TO_VECTOR(Op, DAG);
case ISD::MUL: return LowerMUL(Op, DAG);
}
return SDOperand();
}
//===----------------------------------------------------------------------===//
// Other Lowering Code
//===----------------------------------------------------------------------===//
MachineBasicBlock *
PPCTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
MachineBasicBlock *BB) {
assert((MI->getOpcode() == PPC::SELECT_CC_I4 ||
MI->getOpcode() == PPC::SELECT_CC_I8 ||
MI->getOpcode() == PPC::SELECT_CC_F4 ||
MI->getOpcode() == PPC::SELECT_CC_F8 ||
MI->getOpcode() == PPC::SELECT_CC_VRRC) &&
"Unexpected instr type to insert");
// 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();
ilist<MachineBasicBlock>::iterator It = BB;
++It;
// thisMBB:
// ...
// TrueVal = ...
// cmpTY ccX, r1, r2
// bCC copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *thisMBB = BB;
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
BuildMI(BB, MI->getOperand(4).getImmedValue(), 2)
.addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
MachineFunction *F = BB->getParent();
F->getBasicBlockList().insert(It, copy0MBB);
F->getBasicBlockList().insert(It, sinkMBB);
// Update machine-CFG edges by first adding all successors of the current
// block to the new block which will contain the Phi node for the select.
for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
e = BB->succ_end(); i != e; ++i)
sinkMBB->addSuccessor(*i);
// Next, remove all successors of the current block, and add the true
// and fallthrough blocks as its successors.
while(!BB->succ_empty())
BB->removeSuccessor(BB->succ_begin());
BB->addSuccessor(copy0MBB);
BB->addSuccessor(sinkMBB);
// copy0MBB:
// %FalseValue = ...
// # fallthrough to sinkMBB
BB = copy0MBB;
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);
// sinkMBB:
// %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
// ...
BB = sinkMBB;
BuildMI(BB, PPC::PHI, 4, MI->getOperand(0).getReg())
.addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
.addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
delete MI; // The pseudo instruction is gone now.
return BB;
}
//===----------------------------------------------------------------------===//
// Target Optimization Hooks
//===----------------------------------------------------------------------===//
SDOperand PPCTargetLowering::PerformDAGCombine(SDNode *N,
DAGCombinerInfo &DCI) const {
TargetMachine &TM = getTargetMachine();
SelectionDAG &DAG = DCI.DAG;
switch (N->getOpcode()) {
default: break;
case PPCISD::SHL:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->getValue() == 0) // 0 << V -> 0.
return N->getOperand(0);
}
break;
case PPCISD::SRL:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->getValue() == 0) // 0 >>u V -> 0.
return N->getOperand(0);
}
break;
case PPCISD::SRA:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->getValue() == 0 || // 0 >>s V -> 0.
C->isAllOnesValue()) // -1 >>s V -> -1.
return N->getOperand(0);
}
break;
case ISD::SINT_TO_FP:
if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
if (N->getOperand(0).getOpcode() == ISD::FP_TO_SINT) {
// Turn (sint_to_fp (fp_to_sint X)) -> fctidz/fcfid without load/stores.
// We allow the src/dst to be either f32/f64, but the intermediate
// type must be i64.
if (N->getOperand(0).getValueType() == MVT::i64) {
SDOperand Val = N->getOperand(0).getOperand(0);
if (Val.getValueType() == MVT::f32) {
Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
DCI.AddToWorklist(Val.Val);
}
Val = DAG.getNode(PPCISD::FCTIDZ, MVT::f64, Val);
DCI.AddToWorklist(Val.Val);
Val = DAG.getNode(PPCISD::FCFID, MVT::f64, Val);
DCI.AddToWorklist(Val.Val);
if (N->getValueType(0) == MVT::f32) {
Val = DAG.getNode(ISD::FP_ROUND, MVT::f32, Val);
DCI.AddToWorklist(Val.Val);
}
return Val;
} else if (N->getOperand(0).getValueType() == MVT::i32) {
// If the intermediate type is i32, we can avoid the load/store here
// too.
}
}
}
break;
case ISD::STORE:
// Turn STORE (FP_TO_SINT F) -> STFIWX(FCTIWZ(F)).
if (TM.getSubtarget<PPCSubtarget>().hasSTFIWX() &&
N->getOperand(1).getOpcode() == ISD::FP_TO_SINT &&
N->getOperand(1).getValueType() == MVT::i32) {
SDOperand Val = N->getOperand(1).getOperand(0);
if (Val.getValueType() == MVT::f32) {
Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
DCI.AddToWorklist(Val.Val);
}
Val = DAG.getNode(PPCISD::FCTIWZ, MVT::f64, Val);
DCI.AddToWorklist(Val.Val);
Val = DAG.getNode(PPCISD::STFIWX, MVT::Other, N->getOperand(0), Val,
N->getOperand(2), N->getOperand(3));
DCI.AddToWorklist(Val.Val);
return Val;
}
// Turn STORE (BSWAP) -> sthbrx/stwbrx.
if (N->getOperand(1).getOpcode() == ISD::BSWAP &&
N->getOperand(1).Val->hasOneUse() &&
(N->getOperand(1).getValueType() == MVT::i32 ||
N->getOperand(1).getValueType() == MVT::i16)) {
SDOperand BSwapOp = N->getOperand(1).getOperand(0);
// Do an any-extend to 32-bits if this is a half-word input.
if (BSwapOp.getValueType() == MVT::i16)
BSwapOp = DAG.getNode(ISD::ANY_EXTEND, MVT::i32, BSwapOp);
return DAG.getNode(PPCISD::STBRX, MVT::Other, N->getOperand(0), BSwapOp,
N->getOperand(2), N->getOperand(3),
DAG.getValueType(N->getOperand(1).getValueType()));
}
break;
case ISD::BSWAP:
// Turn BSWAP (LOAD) -> lhbrx/lwbrx.
if (ISD::isNON_EXTLoad(N->getOperand(0).Val) &&
N->getOperand(0).hasOneUse() &&
(N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i16)) {
SDOperand Load = N->getOperand(0);
LoadSDNode *LD = cast<LoadSDNode>(Load);
// Create the byte-swapping load.
std::vector<MVT::ValueType> VTs;
VTs.push_back(MVT::i32);
VTs.push_back(MVT::Other);
SDOperand SV = DAG.getSrcValue(LD->getSrcValue(), LD->getSrcValueOffset());
SDOperand Ops[] = {
LD->getChain(), // Chain
LD->getBasePtr(), // Ptr
SV, // SrcValue
DAG.getValueType(N->getValueType(0)) // VT
};
SDOperand BSLoad = DAG.getNode(PPCISD::LBRX, VTs, Ops, 4);
// If this is an i16 load, insert the truncate.
SDOperand ResVal = BSLoad;
if (N->getValueType(0) == MVT::i16)
ResVal = DAG.getNode(ISD::TRUNCATE, MVT::i16, BSLoad);
// First, combine the bswap away. This makes the value produced by the
// load dead.
DCI.CombineTo(N, ResVal);
// Next, combine the load away, we give it a bogus result value but a real
// chain result. The result value is dead because the bswap is dead.
DCI.CombineTo(Load.Val, ResVal, BSLoad.getValue(1));
// Return N so it doesn't get rechecked!
return SDOperand(N, 0);
}
break;
case PPCISD::VCMP: {
// If a VCMPo node already exists with exactly the same operands as this
// node, use its result instead of this node (VCMPo computes both a CR6 and
// a normal output).
//
if (!N->getOperand(0).hasOneUse() &&
!N->getOperand(1).hasOneUse() &&
!N->getOperand(2).hasOneUse()) {
// Scan all of the users of the LHS, looking for VCMPo's that match.
SDNode *VCMPoNode = 0;
SDNode *LHSN = N->getOperand(0).Val;
for (SDNode::use_iterator UI = LHSN->use_begin(), E = LHSN->use_end();
UI != E; ++UI)
if ((*UI)->getOpcode() == PPCISD::VCMPo &&
(*UI)->getOperand(1) == N->getOperand(1) &&
(*UI)->getOperand(2) == N->getOperand(2) &&
(*UI)->getOperand(0) == N->getOperand(0)) {
VCMPoNode = *UI;
break;
}
// If there is no VCMPo node, or if the flag value has a single use, don't
// transform this.
if (!VCMPoNode || VCMPoNode->hasNUsesOfValue(0, 1))
break;
// Look at the (necessarily single) use of the flag value. If it has a
// chain, this transformation is more complex. Note that multiple things
// could use the value result, which we should ignore.
SDNode *FlagUser = 0;
for (SDNode::use_iterator UI = VCMPoNode->use_begin();
FlagUser == 0; ++UI) {
assert(UI != VCMPoNode->use_end() && "Didn't find user!");
SDNode *User = *UI;
for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
if (User->getOperand(i) == SDOperand(VCMPoNode, 1)) {
FlagUser = User;
break;
}
}
}
// If the user is a MFCR instruction, we know this is safe. Otherwise we
// give up for right now.
if (FlagUser->getOpcode() == PPCISD::MFCR)
return SDOperand(VCMPoNode, 0);
}
break;
}
case ISD::BR_CC: {
// If this is a branch on an altivec predicate comparison, lower this so
// that we don't have to do a MFCR: instead, branch directly on CR6. This
// lowering is done pre-legalize, because the legalizer lowers the predicate
// compare down to code that is difficult to reassemble.
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
SDOperand LHS = N->getOperand(2), RHS = N->getOperand(3);
int CompareOpc;
bool isDot;
if (LHS.getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
isa<ConstantSDNode>(RHS) && (CC == ISD::SETEQ || CC == ISD::SETNE) &&
getAltivecCompareInfo(LHS, CompareOpc, isDot)) {
assert(isDot && "Can't compare against a vector result!");
// If this is a comparison against something other than 0/1, then we know
// that the condition is never/always true.
unsigned Val = cast<ConstantSDNode>(RHS)->getValue();
if (Val != 0 && Val != 1) {
if (CC == ISD::SETEQ) // Cond never true, remove branch.
return N->getOperand(0);
// Always !=, turn it into an unconditional branch.
return DAG.getNode(ISD::BR, MVT::Other,
N->getOperand(0), N->getOperand(4));
}
bool BranchOnWhenPredTrue = (CC == ISD::SETEQ) ^ (Val == 0);
// Create the PPCISD altivec 'dot' comparison node.
std::vector<MVT::ValueType> VTs;
SDOperand Ops[] = {
LHS.getOperand(2), // LHS of compare
LHS.getOperand(3), // RHS of compare
DAG.getConstant(CompareOpc, MVT::i32)
};
VTs.push_back(LHS.getOperand(2).getValueType());
VTs.push_back(MVT::Flag);
SDOperand CompNode = DAG.getNode(PPCISD::VCMPo, VTs, Ops, 3);
// Unpack the result based on how the target uses it.
unsigned CompOpc;
switch (cast<ConstantSDNode>(LHS.getOperand(1))->getValue()) {
default: // Can't happen, don't crash on invalid number though.
case 0: // Branch on the value of the EQ bit of CR6.
CompOpc = BranchOnWhenPredTrue ? PPC::BEQ : PPC::BNE;
break;
case 1: // Branch on the inverted value of the EQ bit of CR6.
CompOpc = BranchOnWhenPredTrue ? PPC::BNE : PPC::BEQ;
break;
case 2: // Branch on the value of the LT bit of CR6.
CompOpc = BranchOnWhenPredTrue ? PPC::BLT : PPC::BGE;
break;
case 3: // Branch on the inverted value of the LT bit of CR6.
CompOpc = BranchOnWhenPredTrue ? PPC::BGE : PPC::BLT;
break;
}
return DAG.getNode(PPCISD::COND_BRANCH, MVT::Other, N->getOperand(0),
DAG.getRegister(PPC::CR6, MVT::i32),
DAG.getConstant(CompOpc, MVT::i32),
N->getOperand(4), CompNode.getValue(1));
}
break;
}
}
return SDOperand();
}
//===----------------------------------------------------------------------===//
// Inline Assembly Support
//===----------------------------------------------------------------------===//
void PPCTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
uint64_t Mask,
uint64_t &KnownZero,
uint64_t &KnownOne,
unsigned Depth) const {
KnownZero = 0;
KnownOne = 0;
switch (Op.getOpcode()) {
default: break;
case PPCISD::LBRX: {
// lhbrx is known to have the top bits cleared out.
if (cast<VTSDNode>(Op.getOperand(3))->getVT() == MVT::i16)
KnownZero = 0xFFFF0000;
break;
}
case ISD::INTRINSIC_WO_CHAIN: {
switch (cast<ConstantSDNode>(Op.getOperand(0))->getValue()) {
default: break;
case Intrinsic::ppc_altivec_vcmpbfp_p:
case Intrinsic::ppc_altivec_vcmpeqfp_p:
case Intrinsic::ppc_altivec_vcmpequb_p:
case Intrinsic::ppc_altivec_vcmpequh_p:
case Intrinsic::ppc_altivec_vcmpequw_p:
case Intrinsic::ppc_altivec_vcmpgefp_p:
case Intrinsic::ppc_altivec_vcmpgtfp_p:
case Intrinsic::ppc_altivec_vcmpgtsb_p:
case Intrinsic::ppc_altivec_vcmpgtsh_p:
case Intrinsic::ppc_altivec_vcmpgtsw_p:
case Intrinsic::ppc_altivec_vcmpgtub_p:
case Intrinsic::ppc_altivec_vcmpgtuh_p:
case Intrinsic::ppc_altivec_vcmpgtuw_p:
KnownZero = ~1U; // All bits but the low one are known to be zero.
break;
}
}
}
}
/// getConstraintType - Given a constraint letter, return the type of
/// constraint it is for this target.
PPCTargetLowering::ConstraintType
PPCTargetLowering::getConstraintType(char ConstraintLetter) const {
switch (ConstraintLetter) {
default: break;
case 'b':
case 'r':
case 'f':
case 'v':
case 'y':
return C_RegisterClass;
}
return TargetLowering::getConstraintType(ConstraintLetter);
}
std::pair<unsigned, const TargetRegisterClass*>
PPCTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
MVT::ValueType VT) const {
if (Constraint.size() == 1) {
// GCC RS6000 Constraint Letters
switch (Constraint[0]) {
case 'b': // R1-R31
case 'r': // R0-R31
if (VT == MVT::i64 && PPCSubTarget.isPPC64())
return std::make_pair(0U, PPC::G8RCRegisterClass);
return std::make_pair(0U, PPC::GPRCRegisterClass);
case 'f':
if (VT == MVT::f32)
return std::make_pair(0U, PPC::F4RCRegisterClass);
else if (VT == MVT::f64)
return std::make_pair(0U, PPC::F8RCRegisterClass);
break;
case 'v':
return std::make_pair(0U, PPC::VRRCRegisterClass);
case 'y': // crrc
return std::make_pair(0U, PPC::CRRCRegisterClass);
}
}
return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
}
// isOperandValidForConstraint
SDOperand PPCTargetLowering::
isOperandValidForConstraint(SDOperand Op, char Letter, SelectionDAG &DAG) {
switch (Letter) {
default: break;
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P': {
if (!isa<ConstantSDNode>(Op)) return SDOperand(0,0);// Must be an immediate.
unsigned Value = cast<ConstantSDNode>(Op)->getValue();
switch (Letter) {
default: assert(0 && "Unknown constraint letter!");
case 'I': // "I" is a signed 16-bit constant.
if ((short)Value == (int)Value) return Op;
break;
case 'J': // "J" is a constant with only the high-order 16 bits nonzero.
case 'L': // "L" is a signed 16-bit constant shifted left 16 bits.
if ((short)Value == 0) return Op;
break;
case 'K': // "K" is a constant with only the low-order 16 bits nonzero.
if ((Value >> 16) == 0) return Op;
break;
case 'M': // "M" is a constant that is greater than 31.
if (Value > 31) return Op;
break;
case 'N': // "N" is a positive constant that is an exact power of two.
if ((int)Value > 0 && isPowerOf2_32(Value)) return Op;
break;
case 'O': // "O" is the constant zero.
if (Value == 0) return Op;
break;
case 'P': // "P" is a constant whose negation is a signed 16-bit constant.
if ((short)-Value == (int)-Value) return Op;
break;
}
break;
}
}
// Handle standard constraint letters.
return TargetLowering::isOperandValidForConstraint(Op, Letter, DAG);
}
/// isLegalAddressImmediate - Return true if the integer value can be used
/// as the offset of the target addressing mode.
bool PPCTargetLowering::isLegalAddressImmediate(int64_t V) const {
// PPC allows a sign-extended 16-bit immediate field.
return (V > -(1 << 16) && V < (1 << 16)-1);
}
bool PPCTargetLowering::isLegalAddressImmediate(llvm::GlobalValue* GV) const {
return TargetLowering::isLegalAddressImmediate(GV);
}
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