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llvm-6502/lib/Target/ARM/ARMISelLowering.cpp

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//===-- ARMISelLowering.cpp - ARM DAG Lowering Implementation -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that ARM uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "ARMAddressingModes.h"
#include "ARMConstantPoolValue.h"
#include "ARMISelLowering.h"
#include "ARMMachineFunctionInfo.h"
#include "ARMRegisterInfo.h"
#include "ARMSubtarget.h"
#include "ARMTargetMachine.h"
#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/Instruction.h"
#include "llvm/Intrinsics.h"
#include "llvm/GlobalValue.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/VectorExtras.h"
#include "llvm/Support/MathExtras.h"
using namespace llvm;
ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
: TargetLowering(TM), ARMPCLabelIndex(0) {
Subtarget = &TM.getSubtarget<ARMSubtarget>();
if (Subtarget->isTargetDarwin()) {
// Uses VFP for Thumb libfuncs if available.
if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
// Single-precision floating-point arithmetic.
setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
// Double-precision floating-point arithmetic.
setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
// Single-precision comparisons.
setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
// Double-precision comparisons.
setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
// Floating-point to integer conversions.
// i64 conversions are done via library routines even when generating VFP
// instructions, so use the same ones.
setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
// Conversions between floating types.
setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
// Integer to floating-point conversions.
// i64 conversions are done via library routines even when generating VFP
// instructions, so use the same ones.
// FIXME: There appears to be some naming inconsistency in ARM libgcc: e.g.
// __floatunsidf vs. __floatunssidfvfp.
setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
}
}
addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
}
computeRegisterProperties();
// ARM does not have f32 extending load.
setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
// ARM does not have i1 sign extending load.
setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
// ARM supports all 4 flavors of integer indexed load / store.
for (unsigned im = (unsigned)ISD::PRE_INC;
im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
setIndexedLoadAction(im, MVT::i1, Legal);
setIndexedLoadAction(im, MVT::i8, Legal);
setIndexedLoadAction(im, MVT::i16, Legal);
setIndexedLoadAction(im, MVT::i32, Legal);
setIndexedStoreAction(im, MVT::i1, Legal);
setIndexedStoreAction(im, MVT::i8, Legal);
setIndexedStoreAction(im, MVT::i16, Legal);
setIndexedStoreAction(im, MVT::i32, Legal);
}
// i64 operation support.
if (Subtarget->isThumb()) {
setOperationAction(ISD::MUL, MVT::i64, Expand);
setOperationAction(ISD::MULHU, MVT::i32, Expand);
setOperationAction(ISD::MULHS, MVT::i32, Expand);
setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
} else {
setOperationAction(ISD::MUL, MVT::i64, Expand);
setOperationAction(ISD::MULHU, MVT::i32, Expand);
if (!Subtarget->hasV6Ops())
setOperationAction(ISD::MULHS, MVT::i32, Expand);
}
setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
setOperationAction(ISD::SRL, MVT::i64, Custom);
setOperationAction(ISD::SRA, MVT::i64, Custom);
// ARM does not have ROTL.
setOperationAction(ISD::ROTL, MVT::i32, Expand);
setOperationAction(ISD::CTTZ , MVT::i32, Expand);
setOperationAction(ISD::CTPOP, MVT::i32, Expand);
if (!Subtarget->hasV5TOps() || Subtarget->isThumb())
setOperationAction(ISD::CTLZ, MVT::i32, Expand);
// Only ARMv6 has BSWAP.
if (!Subtarget->hasV6Ops())
setOperationAction(ISD::BSWAP, MVT::i32, Expand);
// These are expanded into libcalls.
setOperationAction(ISD::SDIV, MVT::i32, Expand);
setOperationAction(ISD::UDIV, MVT::i32, Expand);
setOperationAction(ISD::SREM, MVT::i32, Expand);
setOperationAction(ISD::UREM, MVT::i32, Expand);
setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
// Support label based line numbers.
setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
setOperationAction(ISD::RET, MVT::Other, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
// Use the default implementation.
setOperationAction(ISD::VASTART , MVT::Other, Custom);
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 , Expand);
setOperationAction(ISD::MEMBARRIER , MVT::Other, Expand);
if (!Subtarget->hasV6Ops()) {
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
}
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb())
// Turn f64->i64 into FMRRD, i64 -> f64 to FMDRR iff target supports vfp2.
setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
// We want to custom lower some of our intrinsics.
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
setOperationAction(ISD::SETCC , MVT::i32, Expand);
setOperationAction(ISD::SETCC , MVT::f32, Expand);
setOperationAction(ISD::SETCC , MVT::f64, Expand);
setOperationAction(ISD::SELECT , MVT::i32, Expand);
setOperationAction(ISD::SELECT , MVT::f32, Expand);
setOperationAction(ISD::SELECT , MVT::f64, Expand);
setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
setOperationAction(ISD::BRCOND , MVT::Other, Expand);
setOperationAction(ISD::BR_CC , MVT::i32, Custom);
setOperationAction(ISD::BR_CC , MVT::f32, Custom);
setOperationAction(ISD::BR_CC , MVT::f64, Custom);
setOperationAction(ISD::BR_JT , MVT::Other, Custom);
// We don't support sin/cos/fmod/copysign/pow
setOperationAction(ISD::FSIN , MVT::f64, Expand);
setOperationAction(ISD::FSIN , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f64, Expand);
setOperationAction(ISD::FREM , MVT::f64, Expand);
setOperationAction(ISD::FREM , MVT::f32, Expand);
if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
}
setOperationAction(ISD::FPOW , MVT::f64, Expand);
setOperationAction(ISD::FPOW , MVT::f32, Expand);
// int <-> fp are custom expanded into bit_convert + ARMISD ops.
if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb()) {
setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
}
// We have target-specific dag combine patterns for the following nodes:
// ARMISD::FMRRD - No need to call setTargetDAGCombine
setStackPointerRegisterToSaveRestore(ARM::SP);
setSchedulingPreference(SchedulingForRegPressure);
setIfCvtBlockSizeLimit(Subtarget->isThumb() ? 0 : 10);
setIfCvtDupBlockSizeLimit(Subtarget->isThumb() ? 0 : 2);
maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type
}
const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return 0;
case ARMISD::Wrapper: return "ARMISD::Wrapper";
case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
case ARMISD::CALL: return "ARMISD::CALL";
case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
case ARMISD::tCALL: return "ARMISD::tCALL";
case ARMISD::BRCOND: return "ARMISD::BRCOND";
case ARMISD::BR_JT: return "ARMISD::BR_JT";
case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
case ARMISD::CMP: return "ARMISD::CMP";
case ARMISD::CMPNZ: return "ARMISD::CMPNZ";
case ARMISD::CMPFP: return "ARMISD::CMPFP";
case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
case ARMISD::CMOV: return "ARMISD::CMOV";
case ARMISD::CNEG: return "ARMISD::CNEG";
case ARMISD::FTOSI: return "ARMISD::FTOSI";
case ARMISD::FTOUI: return "ARMISD::FTOUI";
case ARMISD::SITOF: return "ARMISD::SITOF";
case ARMISD::UITOF: return "ARMISD::UITOF";
case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
case ARMISD::RRX: return "ARMISD::RRX";
case ARMISD::FMRRD: return "ARMISD::FMRRD";
case ARMISD::FMDRR: return "ARMISD::FMDRR";
case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
}
}
//===----------------------------------------------------------------------===//
// Lowering Code
//===----------------------------------------------------------------------===//
/// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
switch (CC) {
default: assert(0 && "Unknown condition code!");
case ISD::SETNE: return ARMCC::NE;
case ISD::SETEQ: return ARMCC::EQ;
case ISD::SETGT: return ARMCC::GT;
case ISD::SETGE: return ARMCC::GE;
case ISD::SETLT: return ARMCC::LT;
case ISD::SETLE: return ARMCC::LE;
case ISD::SETUGT: return ARMCC::HI;
case ISD::SETUGE: return ARMCC::HS;
case ISD::SETULT: return ARMCC::LO;
case ISD::SETULE: return ARMCC::LS;
}
}
/// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC. It
/// returns true if the operands should be inverted to form the proper
/// comparison.
static bool FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
ARMCC::CondCodes &CondCode2) {
bool Invert = false;
CondCode2 = ARMCC::AL;
switch (CC) {
default: assert(0 && "Unknown FP condition!");
case ISD::SETEQ:
case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
case ISD::SETGT:
case ISD::SETOGT: CondCode = ARMCC::GT; break;
case ISD::SETGE:
case ISD::SETOGE: CondCode = ARMCC::GE; break;
case ISD::SETOLT: CondCode = ARMCC::MI; break;
case ISD::SETOLE: CondCode = ARMCC::GT; Invert = true; break;
case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
case ISD::SETO: CondCode = ARMCC::VC; break;
case ISD::SETUO: CondCode = ARMCC::VS; break;
case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
case ISD::SETUGT: CondCode = ARMCC::HI; break;
case ISD::SETUGE: CondCode = ARMCC::PL; break;
case ISD::SETLT:
case ISD::SETULT: CondCode = ARMCC::LT; break;
case ISD::SETLE:
case ISD::SETULE: CondCode = ARMCC::LE; break;
case ISD::SETNE:
case ISD::SETUNE: CondCode = ARMCC::NE; break;
}
return Invert;
}
static void
HowToPassArgument(MVT ObjectVT, unsigned NumGPRs,
unsigned StackOffset, unsigned &NeededGPRs,
unsigned &NeededStackSize, unsigned &GPRPad,
unsigned &StackPad, ISD::ArgFlagsTy Flags) {
NeededStackSize = 0;
NeededGPRs = 0;
StackPad = 0;
GPRPad = 0;
unsigned align = Flags.getOrigAlign();
GPRPad = NumGPRs % ((align + 3)/4);
StackPad = StackOffset % align;
unsigned firstGPR = NumGPRs + GPRPad;
switch (ObjectVT.getSimpleVT()) {
default: assert(0 && "Unhandled argument type!");
case MVT::i32:
case MVT::f32:
if (firstGPR < 4)
NeededGPRs = 1;
else
NeededStackSize = 4;
break;
case MVT::i64:
case MVT::f64:
if (firstGPR < 3)
NeededGPRs = 2;
else if (firstGPR == 3) {
NeededGPRs = 1;
NeededStackSize = 4;
} else
NeededStackSize = 8;
}
}
/// LowerCALL - Lowering a ISD::CALL node into a callseq_start <-
/// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
/// nodes.
SDValue ARMTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
MVT RetVT = TheCall->getRetValType(0);
SDValue Chain = TheCall->getChain();
unsigned CallConv = TheCall->getCallingConv();
assert((CallConv == CallingConv::C ||
CallConv == CallingConv::Fast) && "unknown calling convention");
SDValue Callee = TheCall->getCallee();
unsigned NumOps = TheCall->getNumArgs();
unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
unsigned NumGPRs = 0; // GPRs used for parameter passing.
// Count how many bytes are to be pushed on the stack.
unsigned NumBytes = 0;
// Add up all the space actually used.
for (unsigned i = 0; i < NumOps; ++i) {
unsigned ObjSize;
unsigned ObjGPRs;
unsigned StackPad;
unsigned GPRPad;
MVT ObjectVT = TheCall->getArg(i).getValueType();
ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
HowToPassArgument(ObjectVT, NumGPRs, NumBytes, ObjGPRs, ObjSize,
GPRPad, StackPad, Flags);
NumBytes += ObjSize + StackPad;
NumGPRs += ObjGPRs + GPRPad;
}
// Adjust the stack pointer for the new arguments...
// These operations are automatically eliminated by the prolog/epilog pass
Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
SDValue StackPtr = DAG.getRegister(ARM::SP, MVT::i32);
static const unsigned GPRArgRegs[] = {
ARM::R0, ARM::R1, ARM::R2, ARM::R3
};
NumGPRs = 0;
std::vector<std::pair<unsigned, SDValue> > RegsToPass;
std::vector<SDValue> MemOpChains;
for (unsigned i = 0; i != NumOps; ++i) {
SDValue Arg = TheCall->getArg(i);
ISD::ArgFlagsTy Flags = TheCall->getArgFlags(i);
MVT ArgVT = Arg.getValueType();
unsigned ObjSize;
unsigned ObjGPRs;
unsigned GPRPad;
unsigned StackPad;
HowToPassArgument(ArgVT, NumGPRs, ArgOffset, ObjGPRs,
ObjSize, GPRPad, StackPad, Flags);
NumGPRs += GPRPad;
ArgOffset += StackPad;
if (ObjGPRs > 0) {
switch (ArgVT.getSimpleVT()) {
default: assert(0 && "Unexpected ValueType for argument!");
case MVT::i32:
RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Arg));
break;
case MVT::f32:
RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs],
DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg)));
break;
case MVT::i64: {
SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Arg,
DAG.getConstant(0, getPointerTy()));
SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Arg,
DAG.getConstant(1, getPointerTy()));
RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Lo));
if (ObjGPRs == 2)
RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1], Hi));
else {
SDValue PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
MemOpChains.push_back(DAG.getStore(Chain, Hi, PtrOff, NULL, 0));
}
break;
}
case MVT::f64: {
SDValue Cvt = DAG.getNode(ARMISD::FMRRD,
DAG.getVTList(MVT::i32, MVT::i32),
&Arg, 1);
RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs], Cvt));
if (ObjGPRs == 2)
RegsToPass.push_back(std::make_pair(GPRArgRegs[NumGPRs+1],
Cvt.getValue(1)));
else {
SDValue PtrOff= DAG.getConstant(ArgOffset, StackPtr.getValueType());
PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
MemOpChains.push_back(DAG.getStore(Chain, Cvt.getValue(1), PtrOff,
NULL, 0));
}
break;
}
}
} else {
assert(ObjSize != 0);
SDValue PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
}
NumGPRs += ObjGPRs;
ArgOffset += ObjSize;
}
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.
SDValue 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);
}
// 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.
bool isDirect = false;
bool isARMFunc = false;
bool isLocalARMFunc = false;
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
GlobalValue *GV = G->getGlobal();
isDirect = true;
bool isExt = (GV->isDeclaration() || GV->hasWeakLinkage() ||
GV->hasLinkOnceLinkage());
bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
getTargetMachine().getRelocationModel() != Reloc::Static;
isARMFunc = !Subtarget->isThumb() || isStub;
// ARM call to a local ARM function is predicable.
isLocalARMFunc = !Subtarget->isThumb() && !isExt;
// tBX takes a register source operand.
if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
ARMCP::CPStub, 4);
SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 2);
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
Callee = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), CPAddr, NULL, 0);
SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
Callee = DAG.getNode(ARMISD::PIC_ADD, getPointerTy(), Callee, PICLabel);
} else
Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
isDirect = true;
bool isStub = Subtarget->isTargetDarwin() &&
getTargetMachine().getRelocationModel() != Reloc::Static;
isARMFunc = !Subtarget->isThumb() || isStub;
// tBX takes a register source operand.
const char *Sym = S->getSymbol();
if (isARMFunc && Subtarget->isThumb() && !Subtarget->hasV5TOps()) {
ARMConstantPoolValue *CPV = new ARMConstantPoolValue(Sym, ARMPCLabelIndex,
ARMCP::CPStub, 4);
SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 2);
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
Callee = DAG.getLoad(getPointerTy(), DAG.getEntryNode(), CPAddr, NULL, 0);
SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
Callee = DAG.getNode(ARMISD::PIC_ADD, getPointerTy(), Callee, PICLabel);
} else
Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
}
// FIXME: handle tail calls differently.
unsigned CallOpc;
if (Subtarget->isThumb()) {
if (!Subtarget->hasV5TOps() && (!isDirect || isARMFunc))
CallOpc = ARMISD::CALL_NOLINK;
else
CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
} else {
CallOpc = (isDirect || Subtarget->hasV5TOps())
? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
: ARMISD::CALL_NOLINK;
}
if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb()) {
// implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
Chain = DAG.getCopyToReg(Chain, ARM::LR,
DAG.getNode(ISD::UNDEF, MVT::i32), InFlag);
InFlag = Chain.getValue(1);
}
std::vector<SDValue> Ops;
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.getNode())
Ops.push_back(InFlag);
// Returns a chain and a flag for retval copy to use.
Chain = DAG.getNode(CallOpc, DAG.getVTList(MVT::Other, MVT::Flag),
&Ops[0], Ops.size());
InFlag = Chain.getValue(1);
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
DAG.getIntPtrConstant(0, true), InFlag);
if (RetVT != MVT::Other)
InFlag = Chain.getValue(1);
std::vector<SDValue> ResultVals;
// If the call has results, copy the values out of the ret val registers.
switch (RetVT.getSimpleVT()) {
default: assert(0 && "Unexpected ret value!");
case MVT::Other:
break;
case MVT::i32:
Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
ResultVals.push_back(Chain.getValue(0));
if (TheCall->getNumRetVals() > 1 &&
TheCall->getRetValType(1) == MVT::i32) {
// Returns a i64 value.
Chain = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32,
Chain.getValue(2)).getValue(1);
ResultVals.push_back(Chain.getValue(0));
}
break;
case MVT::f32:
Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
ResultVals.push_back(DAG.getNode(ISD::BIT_CONVERT, MVT::f32,
Chain.getValue(0)));
break;
case MVT::f64: {
SDValue Lo = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag);
SDValue Hi = DAG.getCopyFromReg(Lo, ARM::R1, MVT::i32, Lo.getValue(2));
ResultVals.push_back(DAG.getNode(ARMISD::FMDRR, MVT::f64, Lo, Hi));
break;
}
}
if (ResultVals.empty())
return Chain;
ResultVals.push_back(Chain);
SDValue Res = DAG.getMergeValues(&ResultVals[0], ResultVals.size());
return Res.getValue(Op.getResNo());
}
static SDValue LowerRET(SDValue Op, SelectionDAG &DAG) {
SDValue Copy;
SDValue Chain = Op.getOperand(0);
switch(Op.getNumOperands()) {
default:
assert(0 && "Do not know how to return this many arguments!");
abort();
case 1: {
SDValue LR = DAG.getRegister(ARM::LR, MVT::i32);
return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
}
case 3:
Op = Op.getOperand(1);
if (Op.getValueType() == MVT::f32) {
Op = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
} else if (Op.getValueType() == MVT::f64) {
// Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
// available.
Op = DAG.getNode(ARMISD::FMRRD, DAG.getVTList(MVT::i32, MVT::i32), &Op,1);
SDValue Sign = DAG.getConstant(0, MVT::i32);
return DAG.getNode(ISD::RET, MVT::Other, Chain, Op, Sign,
Op.getValue(1), Sign);
}
Copy = DAG.getCopyToReg(Chain, ARM::R0, Op, SDValue());
if (DAG.getMachineFunction().getRegInfo().liveout_empty())
DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
break;
case 5:
Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDValue());
Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
// If we haven't noted the R0+R1 are live out, do so now.
if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R1);
}
break;
case 9: // i128 -> 4 regs
Copy = DAG.getCopyToReg(Chain, ARM::R3, Op.getOperand(7), SDValue());
Copy = DAG.getCopyToReg(Copy , ARM::R2, Op.getOperand(5), Copy.getValue(1));
Copy = DAG.getCopyToReg(Copy , ARM::R1, Op.getOperand(3), Copy.getValue(1));
Copy = DAG.getCopyToReg(Copy , ARM::R0, Op.getOperand(1), Copy.getValue(1));
// If we haven't noted the R0+R1 are live out, do so now.
if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R0);
DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R1);
DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R2);
DAG.getMachineFunction().getRegInfo().addLiveOut(ARM::R3);
}
break;
}
//We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
}
// ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
// their target countpart wrapped in the ARMISD::Wrapper node. Suppose N is
// one of the above mentioned nodes. It has to be wrapped because otherwise
// Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
// be used to form addressing mode. These wrapped nodes will be selected
// into MOVi.
static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
MVT PtrVT = Op.getValueType();
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
SDValue Res;
if (CP->isMachineConstantPoolEntry())
Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
CP->getAlignment());
else
Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
CP->getAlignment());
return DAG.getNode(ARMISD::Wrapper, MVT::i32, Res);
}
// Lower ISD::GlobalTLSAddress using the "general dynamic" model
SDValue
ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
SelectionDAG &DAG) {
MVT PtrVT = getPointerTy();
unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
ARMConstantPoolValue *CPV =
new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
PCAdj, "tlsgd", true);
SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 2);
Argument = DAG.getNode(ARMISD::Wrapper, MVT::i32, Argument);
Argument = DAG.getLoad(PtrVT, DAG.getEntryNode(), Argument, NULL, 0);
SDValue Chain = Argument.getValue(1);
SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
Argument = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Argument, PICLabel);
// call __tls_get_addr.
ArgListTy Args;
ArgListEntry Entry;
Entry.Node = Argument;
Entry.Ty = (const Type *) Type::Int32Ty;
Args.push_back(Entry);
std::pair<SDValue, SDValue> CallResult =
LowerCallTo(Chain, (const Type *) Type::Int32Ty, false, false, false, false,
CallingConv::C, false,
DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG);
return CallResult.first;
}
// Lower ISD::GlobalTLSAddress using the "initial exec" or
// "local exec" model.
SDValue
ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
SelectionDAG &DAG) {
GlobalValue *GV = GA->getGlobal();
SDValue Offset;
SDValue Chain = DAG.getEntryNode();
MVT PtrVT = getPointerTy();
// Get the Thread Pointer
SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, PtrVT);
if (GV->isDeclaration()){
// initial exec model
unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
ARMConstantPoolValue *CPV =
new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex, ARMCP::CPValue,
PCAdj, "gottpoff", true);
Offset = DAG.getTargetConstantPool(CPV, PtrVT, 2);
Offset = DAG.getNode(ARMISD::Wrapper, MVT::i32, Offset);
Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
Chain = Offset.getValue(1);
SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
Offset = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Offset, PICLabel);
Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
} else {
// local exec model
ARMConstantPoolValue *CPV =
new ARMConstantPoolValue(GV, ARMCP::CPValue, "tpoff");
Offset = DAG.getTargetConstantPool(CPV, PtrVT, 2);
Offset = DAG.getNode(ARMISD::Wrapper, MVT::i32, Offset);
Offset = DAG.getLoad(PtrVT, Chain, Offset, NULL, 0);
}
// The address of the thread local variable is the add of the thread
// pointer with the offset of the variable.
return DAG.getNode(ISD::ADD, PtrVT, ThreadPointer, Offset);
}
SDValue
ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) {
// TODO: implement the "local dynamic" model
assert(Subtarget->isTargetELF() &&
"TLS not implemented for non-ELF targets");
GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
// If the relocation model is PIC, use the "General Dynamic" TLS Model,
// otherwise use the "Local Exec" TLS Model
if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
return LowerToTLSGeneralDynamicModel(GA, DAG);
else
return LowerToTLSExecModels(GA, DAG);
}
SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
SelectionDAG &DAG) {
MVT PtrVT = getPointerTy();
GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
Reloc::Model RelocM = getTargetMachine().getRelocationModel();
if (RelocM == Reloc::PIC_) {
bool UseGOTOFF = GV->hasInternalLinkage() || GV->hasHiddenVisibility();
ARMConstantPoolValue *CPV =
new ARMConstantPoolValue(GV, ARMCP::CPValue, UseGOTOFF ? "GOTOFF":"GOT");
SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
SDValue Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
SDValue Chain = Result.getValue(1);
SDValue GOT = DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, PtrVT);
Result = DAG.getNode(ISD::ADD, PtrVT, Result, GOT);
if (!UseGOTOFF)
Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
return Result;
} else {
SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
return DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
}
}
/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol
/// even in non-static mode.
static bool GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) {
// If symbol visibility is hidden, the extra load is not needed if
// the symbol is definitely defined in the current translation unit.
bool isDecl = GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode();
if (GV->hasHiddenVisibility() && (!isDecl && !GV->hasCommonLinkage()))
return false;
return RelocM != Reloc::Static && (isDecl || GV->mayBeOverridden());
}
SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
SelectionDAG &DAG) {
MVT PtrVT = getPointerTy();
GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
Reloc::Model RelocM = getTargetMachine().getRelocationModel();
bool IsIndirect = GVIsIndirectSymbol(GV, RelocM);
SDValue CPAddr;
if (RelocM == Reloc::Static)
CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 2);
else {
unsigned PCAdj = (RelocM != Reloc::PIC_)
? 0 : (Subtarget->isThumb() ? 4 : 8);
ARMCP::ARMCPKind Kind = IsIndirect ? ARMCP::CPNonLazyPtr
: ARMCP::CPValue;
ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, ARMPCLabelIndex,
Kind, PCAdj);
CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
}
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
SDValue Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
SDValue Chain = Result.getValue(1);
if (RelocM == Reloc::PIC_) {
SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
Result = DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
}
if (IsIndirect)
Result = DAG.getLoad(PtrVT, Chain, Result, NULL, 0);
return Result;
}
SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
SelectionDAG &DAG){
assert(Subtarget->isTargetELF() &&
"GLOBAL OFFSET TABLE not implemented for non-ELF targets");
MVT PtrVT = getPointerTy();
unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
ARMConstantPoolValue *CPV = new ARMConstantPoolValue("_GLOBAL_OFFSET_TABLE_",
ARMPCLabelIndex,
ARMCP::CPValue, PCAdj);
SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 2);
CPAddr = DAG.getNode(ARMISD::Wrapper, MVT::i32, CPAddr);
SDValue Result = DAG.getLoad(PtrVT, DAG.getEntryNode(), CPAddr, NULL, 0);
SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex++, MVT::i32);
return DAG.getNode(ARMISD::PIC_ADD, PtrVT, Result, PICLabel);
}
static SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) {
MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
switch (IntNo) {
default: return SDValue(); // Don't custom lower most intrinsics.
case Intrinsic::arm_thread_pointer:
return DAG.getNode(ARMISD::THREAD_POINTER, PtrVT);
}
}
static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
unsigned VarArgsFrameIndex) {
// vastart just stores the address of the VarArgsFrameIndex slot into the
// memory location argument.
MVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDValue FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV, 0);
}
static SDValue LowerFORMAL_ARGUMENT(SDValue Op, SelectionDAG &DAG,
unsigned ArgNo, unsigned &NumGPRs,
unsigned &ArgOffset) {
MachineFunction &MF = DAG.getMachineFunction();
MVT ObjectVT = Op.getValue(ArgNo).getValueType();
SDValue Root = Op.getOperand(0);
MachineRegisterInfo &RegInfo = MF.getRegInfo();
static const unsigned GPRArgRegs[] = {
ARM::R0, ARM::R1, ARM::R2, ARM::R3
};
unsigned ObjSize;
unsigned ObjGPRs;
unsigned GPRPad;
unsigned StackPad;
ISD::ArgFlagsTy Flags =
cast<ARG_FLAGSSDNode>(Op.getOperand(ArgNo + 3))->getArgFlags();
HowToPassArgument(ObjectVT, NumGPRs, ArgOffset, ObjGPRs,
ObjSize, GPRPad, StackPad, Flags);
NumGPRs += GPRPad;
ArgOffset += StackPad;
SDValue ArgValue;
if (ObjGPRs == 1) {
unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
ArgValue = DAG.getCopyFromReg(Root, VReg, MVT::i32);
if (ObjectVT == MVT::f32)
ArgValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, ArgValue);
} else if (ObjGPRs == 2) {
unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
ArgValue = DAG.getCopyFromReg(Root, VReg, MVT::i32);
VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
RegInfo.addLiveIn(GPRArgRegs[NumGPRs+1], VReg);
SDValue ArgValue2 = DAG.getCopyFromReg(Root, VReg, MVT::i32);
assert(ObjectVT != MVT::i64 && "i64 should already be lowered");
ArgValue = DAG.getNode(ARMISD::FMDRR, MVT::f64, ArgValue, ArgValue2);
}
NumGPRs += ObjGPRs;
if (ObjSize) {
MachineFrameInfo *MFI = MF.getFrameInfo();
int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
if (ObjGPRs == 0)
ArgValue = DAG.getLoad(ObjectVT, Root, FIN, NULL, 0);
else {
SDValue ArgValue2 = DAG.getLoad(MVT::i32, Root, FIN, NULL, 0);
assert(ObjectVT != MVT::i64 && "i64 should already be lowered");
ArgValue = DAG.getNode(ARMISD::FMDRR, MVT::f64, ArgValue, ArgValue2);
}
ArgOffset += ObjSize; // Move on to the next argument.
}
return ArgValue;
}
SDValue
ARMTargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG) {
std::vector<SDValue> ArgValues;
SDValue Root = Op.getOperand(0);
unsigned ArgOffset = 0; // Frame mechanisms handle retaddr slot
unsigned NumGPRs = 0; // GPRs used for parameter passing.
unsigned NumArgs = Op.getNode()->getNumValues()-1;
for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo)
ArgValues.push_back(LowerFORMAL_ARGUMENT(Op, DAG, ArgNo,
NumGPRs, ArgOffset));
bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
if (isVarArg) {
static const unsigned GPRArgRegs[] = {
ARM::R0, ARM::R1, ARM::R2, ARM::R3
};
MachineFunction &MF = DAG.getMachineFunction();
MachineRegisterInfo &RegInfo = MF.getRegInfo();
MachineFrameInfo *MFI = MF.getFrameInfo();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
unsigned VARegSize = (4 - NumGPRs) * 4;
unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
if (VARegSaveSize) {
// 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.
AFI->setVarArgsRegSaveSize(VARegSaveSize);
VarArgsFrameIndex = MFI->CreateFixedObject(VARegSaveSize, ArgOffset +
VARegSaveSize - VARegSize);
SDValue FIN = DAG.getFrameIndex(VarArgsFrameIndex, getPointerTy());
SmallVector<SDValue, 4> MemOps;
for (; NumGPRs < 4; ++NumGPRs) {
unsigned VReg = RegInfo.createVirtualRegister(&ARM::GPRRegClass);
RegInfo.addLiveIn(GPRArgRegs[NumGPRs], VReg);
SDValue Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
SDValue Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
MemOps.push_back(Store);
FIN = DAG.getNode(ISD::ADD, getPointerTy(), FIN,
DAG.getConstant(4, getPointerTy()));
}
if (!MemOps.empty())
Root = DAG.getNode(ISD::TokenFactor, MVT::Other,
&MemOps[0], MemOps.size());
} else
// This will point to the next argument passed via stack.
VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
}
ArgValues.push_back(Root);
// Return the new list of results.
return DAG.getNode(ISD::MERGE_VALUES, Op.getNode()->getVTList(),
&ArgValues[0], ArgValues.size());
}
/// isFloatingPointZero - Return true if this is +0.0.
static bool isFloatingPointZero(SDValue Op) {
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
return CFP->getValueAPF().isPosZero();
else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
// Maybe this has already been legalized into the constant pool?
if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
SDValue WrapperOp = Op.getOperand(1).getOperand(0);
if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
if (ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
return CFP->getValueAPF().isPosZero();
}
}
return false;
}
static bool isLegalCmpImmediate(unsigned C, bool isThumb) {
return ( isThumb && (C & ~255U) == 0) ||
(!isThumb && ARM_AM::getSOImmVal(C) != -1);
}
/// Returns appropriate ARM CMP (cmp) and corresponding condition code for
/// the given operands.
static SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
SDValue &ARMCC, SelectionDAG &DAG, bool isThumb) {
if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
unsigned C = RHSC->getZExtValue();
if (!isLegalCmpImmediate(C, isThumb)) {
// Constant does not fit, try adjusting it by one?
switch (CC) {
default: break;
case ISD::SETLT:
case ISD::SETGE:
if (isLegalCmpImmediate(C-1, isThumb)) {
CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
RHS = DAG.getConstant(C-1, MVT::i32);
}
break;
case ISD::SETULT:
case ISD::SETUGE:
if (C > 0 && isLegalCmpImmediate(C-1, isThumb)) {
CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
RHS = DAG.getConstant(C-1, MVT::i32);
}
break;
case ISD::SETLE:
case ISD::SETGT:
if (isLegalCmpImmediate(C+1, isThumb)) {
CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
RHS = DAG.getConstant(C+1, MVT::i32);
}
break;
case ISD::SETULE:
case ISD::SETUGT:
if (C < 0xffffffff && isLegalCmpImmediate(C+1, isThumb)) {
CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
RHS = DAG.getConstant(C+1, MVT::i32);
}
break;
}
}
}
ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
ARMISD::NodeType CompareType;
switch (CondCode) {
default:
CompareType = ARMISD::CMP;
break;
case ARMCC::EQ:
case ARMCC::NE:
case ARMCC::MI:
case ARMCC::PL:
// Uses only N and Z Flags
CompareType = ARMISD::CMPNZ;
break;
}
ARMCC = DAG.getConstant(CondCode, MVT::i32);
return DAG.getNode(CompareType, MVT::Flag, LHS, RHS);
}
/// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
static SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG) {
SDValue Cmp;
if (!isFloatingPointZero(RHS))
Cmp = DAG.getNode(ARMISD::CMPFP, MVT::Flag, LHS, RHS);
else
Cmp = DAG.getNode(ARMISD::CMPFPw0, MVT::Flag, LHS);
return DAG.getNode(ARMISD::FMSTAT, MVT::Flag, Cmp);
}
static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *ST) {
MVT VT = Op.getValueType();
SDValue LHS = Op.getOperand(0);
SDValue RHS = Op.getOperand(1);
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
SDValue TrueVal = Op.getOperand(2);
SDValue FalseVal = Op.getOperand(3);
if (LHS.getValueType() == MVT::i32) {
SDValue ARMCC;
SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb());
return DAG.getNode(ARMISD::CMOV, VT, FalseVal, TrueVal, ARMCC, CCR, Cmp);
}
ARMCC::CondCodes CondCode, CondCode2;
if (FPCCToARMCC(CC, CondCode, CondCode2))
std::swap(TrueVal, FalseVal);
SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
SDValue Cmp = getVFPCmp(LHS, RHS, DAG);
SDValue Result = DAG.getNode(ARMISD::CMOV, VT, FalseVal, TrueVal,
ARMCC, CCR, Cmp);
if (CondCode2 != ARMCC::AL) {
SDValue ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
// FIXME: Needs another CMP because flag can have but one use.
SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG);
Result = DAG.getNode(ARMISD::CMOV, VT, Result, TrueVal, ARMCC2, CCR, Cmp2);
}
return Result;
}
static SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *ST) {
SDValue Chain = Op.getOperand(0);
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
SDValue LHS = Op.getOperand(2);
SDValue RHS = Op.getOperand(3);
SDValue Dest = Op.getOperand(4);
if (LHS.getValueType() == MVT::i32) {
SDValue ARMCC;
SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, ST->isThumb());
return DAG.getNode(ARMISD::BRCOND, MVT::Other, Chain, Dest, ARMCC, CCR,Cmp);
}
assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
ARMCC::CondCodes CondCode, CondCode2;
if (FPCCToARMCC(CC, CondCode, CondCode2))
// Swap the LHS/RHS of the comparison if needed.
std::swap(LHS, RHS);
SDValue Cmp = getVFPCmp(LHS, RHS, DAG);
SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
SDValue Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
SDValue Res = DAG.getNode(ARMISD::BRCOND, VTList, Ops, 5);
if (CondCode2 != ARMCC::AL) {
ARMCC = DAG.getConstant(CondCode2, MVT::i32);
SDValue Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
Res = DAG.getNode(ARMISD::BRCOND, VTList, Ops, 5);
}
return Res;
}
SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) {
SDValue Chain = Op.getOperand(0);
SDValue Table = Op.getOperand(1);
SDValue Index = Op.getOperand(2);
MVT PTy = getPointerTy();
JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
Table = DAG.getNode(ARMISD::WrapperJT, MVT::i32, JTI, UId);
Index = DAG.getNode(ISD::MUL, PTy, Index, DAG.getConstant(4, PTy));
SDValue Addr = DAG.getNode(ISD::ADD, PTy, Index, Table);
bool isPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
Addr = DAG.getLoad(isPIC ? (MVT)MVT::i32 : PTy,
Chain, Addr, NULL, 0);
Chain = Addr.getValue(1);
if (isPIC)
Addr = DAG.getNode(ISD::ADD, PTy, Addr, Table);
return DAG.getNode(ARMISD::BR_JT, MVT::Other, Chain, Addr, JTI, UId);
}
static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
unsigned Opc =
Op.getOpcode() == ISD::FP_TO_SINT ? ARMISD::FTOSI : ARMISD::FTOUI;
Op = DAG.getNode(Opc, MVT::f32, Op.getOperand(0));
return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
}
static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
MVT VT = Op.getValueType();
unsigned Opc =
Op.getOpcode() == ISD::SINT_TO_FP ? ARMISD::SITOF : ARMISD::UITOF;
Op = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
return DAG.getNode(Opc, VT, Op);
}
static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
// Implement fcopysign with a fabs and a conditional fneg.
SDValue Tmp0 = Op.getOperand(0);
SDValue Tmp1 = Op.getOperand(1);
MVT VT = Op.getValueType();
MVT SrcVT = Tmp1.getValueType();
SDValue AbsVal = DAG.getNode(ISD::FABS, VT, Tmp0);
SDValue Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG);
SDValue ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
return DAG.getNode(ARMISD::CNEG, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
}
SDValue
ARMTargetLowering::EmitTargetCodeForMemcpy(SelectionDAG &DAG,
SDValue Chain,
SDValue Dst, SDValue Src,
SDValue Size, unsigned Align,
bool AlwaysInline,
const Value *DstSV, uint64_t DstSVOff,
const Value *SrcSV, uint64_t SrcSVOff){
// Do repeated 4-byte loads and stores. To be improved.
// This requires 4-byte alignment.
if ((Align & 3) != 0)
return SDValue();
// This requires the copy size to be a constant, preferrably
// within a subtarget-specific limit.
ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
if (!ConstantSize)
return SDValue();
uint64_t SizeVal = ConstantSize->getZExtValue();
if (!AlwaysInline && SizeVal > getSubtarget()->getMaxInlineSizeThreshold())
return SDValue();
unsigned BytesLeft = SizeVal & 3;
unsigned NumMemOps = SizeVal >> 2;
unsigned EmittedNumMemOps = 0;
MVT VT = MVT::i32;
unsigned VTSize = 4;
unsigned i = 0;
const unsigned MAX_LOADS_IN_LDM = 6;
SDValue TFOps[MAX_LOADS_IN_LDM];
SDValue Loads[MAX_LOADS_IN_LDM];
uint64_t SrcOff = 0, DstOff = 0;
// Emit up to MAX_LOADS_IN_LDM loads, then a TokenFactor barrier, then the
// same number of stores. The loads and stores will get combined into
// ldm/stm later on.
while (EmittedNumMemOps < NumMemOps) {
for (i = 0;
i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
Loads[i] = DAG.getLoad(VT, Chain,
DAG.getNode(ISD::ADD, MVT::i32, Src,
DAG.getConstant(SrcOff, MVT::i32)),
SrcSV, SrcSVOff + SrcOff);
TFOps[i] = Loads[i].getValue(1);
SrcOff += VTSize;
}
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
for (i = 0;
i < MAX_LOADS_IN_LDM && EmittedNumMemOps + i < NumMemOps; ++i) {
TFOps[i] = DAG.getStore(Chain, Loads[i],
DAG.getNode(ISD::ADD, MVT::i32, Dst,
DAG.getConstant(DstOff, MVT::i32)),
DstSV, DstSVOff + DstOff);
DstOff += VTSize;
}
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
EmittedNumMemOps += i;
}
if (BytesLeft == 0)
return Chain;
// Issue loads / stores for the trailing (1 - 3) bytes.
unsigned BytesLeftSave = BytesLeft;
i = 0;
while (BytesLeft) {
if (BytesLeft >= 2) {
VT = MVT::i16;
VTSize = 2;
} else {
VT = MVT::i8;
VTSize = 1;
}
Loads[i] = DAG.getLoad(VT, Chain,
DAG.getNode(ISD::ADD, MVT::i32, Src,
DAG.getConstant(SrcOff, MVT::i32)),
SrcSV, SrcSVOff + SrcOff);
TFOps[i] = Loads[i].getValue(1);
++i;
SrcOff += VTSize;
BytesLeft -= VTSize;
}
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
i = 0;
BytesLeft = BytesLeftSave;
while (BytesLeft) {
if (BytesLeft >= 2) {
VT = MVT::i16;
VTSize = 2;
} else {
VT = MVT::i8;
VTSize = 1;
}
TFOps[i] = DAG.getStore(Chain, Loads[i],
DAG.getNode(ISD::ADD, MVT::i32, Dst,
DAG.getConstant(DstOff, MVT::i32)),
DstSV, DstSVOff + DstOff);
++i;
DstOff += VTSize;
BytesLeft -= VTSize;
}
return DAG.getNode(ISD::TokenFactor, MVT::Other, &TFOps[0], i);
}
static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
SDValue Op = N->getOperand(0);
if (N->getValueType(0) == MVT::f64) {
// Turn i64->f64 into FMDRR.
SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
DAG.getConstant(0, MVT::i32));
SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
DAG.getConstant(1, MVT::i32));
return DAG.getNode(ARMISD::FMDRR, MVT::f64, Lo, Hi);
}
// Turn f64->i64 into FMRRD.
SDValue Cvt = DAG.getNode(ARMISD::FMRRD, DAG.getVTList(MVT::i32, MVT::i32),
&Op, 1);
// Merge the pieces into a single i64 value.
return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Cvt, Cvt.getValue(1));
}
static SDValue ExpandSRx(SDNode *N, SelectionDAG &DAG, const ARMSubtarget *ST) {
assert(N->getValueType(0) == MVT::i64 &&
(N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
"Unknown shift to lower!");
// We only lower SRA, SRL of 1 here, all others use generic lowering.
if (!isa<ConstantSDNode>(N->getOperand(1)) ||
cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1)
return SDValue();
// If we are in thumb mode, we don't have RRX.
if (ST->isThumb()) return SDValue();
// Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, N->getOperand(0),
DAG.getConstant(0, MVT::i32));
SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, N->getOperand(0),
DAG.getConstant(1, MVT::i32));
// First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
// captures the result into a carry flag.
unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
Hi = DAG.getNode(Opc, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
// The low part is an ARMISD::RRX operand, which shifts the carry in.
Lo = DAG.getNode(ARMISD::RRX, MVT::i32, Lo, Hi.getValue(1));
// Merge the pieces into a single i64 value.
return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
}
SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
switch (Op.getOpcode()) {
default: assert(0 && "Don't know how to custom lower this!"); abort();
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
case ISD::GlobalAddress:
return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
LowerGlobalAddressELF(Op, DAG);
case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
case ISD::CALL: return LowerCALL(Op, DAG);
case ISD::RET: return LowerRET(Op, DAG);
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG, Subtarget);
case ISD::BR_CC: return LowerBR_CC(Op, DAG, Subtarget);
case ISD::BR_JT: return LowerBR_JT(Op, DAG);
case ISD::VASTART: return LowerVASTART(Op, DAG, VarArgsFrameIndex);
case ISD::SINT_TO_FP:
case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
case ISD::FP_TO_SINT:
case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
case ISD::RETURNADDR: break;
case ISD::FRAMEADDR: break;
case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(Op.getNode(), DAG);
case ISD::SRL:
case ISD::SRA: return ExpandSRx(Op.getNode(), DAG,Subtarget);
}
return SDValue();
}
/// ReplaceNodeResults - Replace the results of node with an illegal result
/// type with new values built out of custom code.
///
void ARMTargetLowering::ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG) {
switch (N->getOpcode()) {
default:
assert(0 && "Don't know how to custom expand this!");
return;
case ISD::BIT_CONVERT:
Results.push_back(ExpandBIT_CONVERT(N, DAG));
return;
case ISD::SRL:
case ISD::SRA: {
SDValue Res = ExpandSRx(N, DAG, Subtarget);
if (Res.getNode())
Results.push_back(Res);
return;
}
}
}
//===----------------------------------------------------------------------===//
// ARM Scheduler Hooks
//===----------------------------------------------------------------------===//
MachineBasicBlock *
ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) {
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
switch (MI->getOpcode()) {
default: assert(false && "Unexpected instr type to insert");
case ARM::tMOVCCr: {
// To "insert" a SELECT_CC instruction, we actually have to insert the
// diamond control-flow pattern. The incoming instruction knows the
// destination vreg to set, the condition code register to branch on, the
// true/false values to select between, and a branch opcode to use.
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineFunction::iterator It = BB;
++It;
// thisMBB:
// ...
// TrueVal = ...
// cmpTY ccX, r1, r2
// bCC copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *thisMBB = BB;
MachineFunction *F = BB->getParent();
MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
BuildMI(BB, TII->get(ARM::tBcc)).addMBB(sinkMBB)
.addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
F->insert(It, copy0MBB);
F->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, TII->get(ARM::PHI), MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
.addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
return BB;
}
}
}
//===----------------------------------------------------------------------===//
// ARM Optimization Hooks
//===----------------------------------------------------------------------===//
/// PerformFMRRDCombine - Target-specific dag combine xforms for ARMISD::FMRRD.
static SDValue PerformFMRRDCombine(SDNode *N,
TargetLowering::DAGCombinerInfo &DCI) {
// fmrrd(fmdrr x, y) -> x,y
SDValue InDouble = N->getOperand(0);
if (InDouble.getOpcode() == ARMISD::FMDRR)
return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
return SDValue();
}
SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N,
DAGCombinerInfo &DCI) const {
switch (N->getOpcode()) {
default: break;
case ARMISD::FMRRD: return PerformFMRRDCombine(N, DCI);
}
return SDValue();
}
/// isLegalAddressImmediate - Return true if the integer value can be used
/// as the offset of the target addressing mode for load / store of the
/// given type.
static bool isLegalAddressImmediate(int64_t V, MVT VT,
const ARMSubtarget *Subtarget) {
if (V == 0)
return true;
if (Subtarget->isThumb()) {
if (V < 0)
return false;
unsigned Scale = 1;
switch (VT.getSimpleVT()) {
default: return false;
case MVT::i1:
case MVT::i8:
// Scale == 1;
break;
case MVT::i16:
// Scale == 2;
Scale = 2;
break;
case MVT::i32:
// Scale == 4;
Scale = 4;
break;
}
if ((V & (Scale - 1)) != 0)
return false;
V /= Scale;
return V == (V & ((1LL << 5) - 1));
}
if (V < 0)
V = - V;
switch (VT.getSimpleVT()) {
default: return false;
case MVT::i1:
case MVT::i8:
case MVT::i32:
// +- imm12
return V == (V & ((1LL << 12) - 1));
case MVT::i16:
// +- imm8
return V == (V & ((1LL << 8) - 1));
case MVT::f32:
case MVT::f64:
if (!Subtarget->hasVFP2())
return false;
if ((V & 3) != 0)
return false;
V >>= 2;
return V == (V & ((1LL << 8) - 1));
}
}
/// isLegalAddressingMode - Return true if the addressing mode represented
/// by AM is legal for this target, for a load/store of the specified type.
bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
const Type *Ty) const {
if (!isLegalAddressImmediate(AM.BaseOffs, getValueType(Ty, true), Subtarget))
return false;
// Can never fold addr of global into load/store.
if (AM.BaseGV)
return false;
switch (AM.Scale) {
case 0: // no scale reg, must be "r+i" or "r", or "i".
break;
case 1:
if (Subtarget->isThumb())
return false;
// FALL THROUGH.
default:
// ARM doesn't support any R+R*scale+imm addr modes.
if (AM.BaseOffs)
return false;
int Scale = AM.Scale;
switch (getValueType(Ty).getSimpleVT()) {
default: return false;
case MVT::i1:
case MVT::i8:
case MVT::i32:
case MVT::i64:
// This assumes i64 is legalized to a pair of i32. If not (i.e.
// ldrd / strd are used, then its address mode is same as i16.
// r + r
if (Scale < 0) Scale = -Scale;
if (Scale == 1)
return true;
// r + r << imm
return isPowerOf2_32(Scale & ~1);
case MVT::i16:
// r + r
if (((unsigned)AM.HasBaseReg + Scale) <= 2)
return true;
return false;
case MVT::isVoid:
// Note, we allow "void" uses (basically, uses that aren't loads or
// stores), because arm allows folding a scale into many arithmetic
// operations. This should be made more precise and revisited later.
// Allow r << imm, but the imm has to be a multiple of two.
if (AM.Scale & 1) return false;
return isPowerOf2_32(AM.Scale);
}
break;
}
return true;
}
static bool getIndexedAddressParts(SDNode *Ptr, MVT VT,
bool isSEXTLoad, SDValue &Base,
SDValue &Offset, bool &isInc,
SelectionDAG &DAG) {
if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
return false;
if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
// AddressingMode 3
Base = Ptr->getOperand(0);
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
int RHSC = (int)RHS->getZExtValue();
if (RHSC < 0 && RHSC > -256) {
isInc = false;
Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
return true;
}
}
isInc = (Ptr->getOpcode() == ISD::ADD);
Offset = Ptr->getOperand(1);
return true;
} else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
// AddressingMode 2
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
int RHSC = (int)RHS->getZExtValue();
if (RHSC < 0 && RHSC > -0x1000) {
isInc = false;
Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
Base = Ptr->getOperand(0);
return true;
}
}
if (Ptr->getOpcode() == ISD::ADD) {
isInc = true;
ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
if (ShOpcVal != ARM_AM::no_shift) {
Base = Ptr->getOperand(1);
Offset = Ptr->getOperand(0);
} else {
Base = Ptr->getOperand(0);
Offset = Ptr->getOperand(1);
}
return true;
}
isInc = (Ptr->getOpcode() == ISD::ADD);
Base = Ptr->getOperand(0);
Offset = Ptr->getOperand(1);
return true;
}
// FIXME: Use FLDM / FSTM to emulate indexed FP load / store.
return false;
}
/// 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
ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
SDValue &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) {
if (Subtarget->isThumb())
return false;
MVT VT;
SDValue Ptr;
bool isSEXTLoad = false;
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
Ptr = LD->getBasePtr();
VT = LD->getMemoryVT();
isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
Ptr = ST->getBasePtr();
VT = ST->getMemoryVT();
} else
return false;
bool isInc;
bool isLegal = getIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base, Offset,
isInc, DAG);
if (isLegal) {
AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
return true;
}
return false;
}
/// getPostIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if this node can be
/// combined with a load / store to form a post-indexed load / store.
bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
SDValue &Base,
SDValue &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) {
if (Subtarget->isThumb())
return false;
MVT VT;
SDValue Ptr;
bool isSEXTLoad = false;
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
VT = LD->getMemoryVT();
isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
VT = ST->getMemoryVT();
} else
return false;
bool isInc;
bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
isInc, DAG);
if (isLegal) {
AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
return true;
}
return false;
}
void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
const APInt &Mask,
APInt &KnownZero,
APInt &KnownOne,
const SelectionDAG &DAG,
unsigned Depth) const {
KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
switch (Op.getOpcode()) {
default: break;
case ARMISD::CMOV: {
// Bits are known zero/one if known on the LHS and RHS.
DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
if (KnownZero == 0 && KnownOne == 0) return;
APInt KnownZeroRHS, KnownOneRHS;
DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
KnownZeroRHS, KnownOneRHS, Depth+1);
KnownZero &= KnownZeroRHS;
KnownOne &= KnownOneRHS;
return;
}
}
}
//===----------------------------------------------------------------------===//
// ARM Inline Assembly Support
//===----------------------------------------------------------------------===//
/// getConstraintType - Given a constraint letter, return the type of
/// constraint it is for this target.
ARMTargetLowering::ConstraintType
ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default: break;
case 'l': return C_RegisterClass;
case 'w': return C_RegisterClass;
}
}
return TargetLowering::getConstraintType(Constraint);
}
std::pair<unsigned, const TargetRegisterClass*>
ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
MVT VT) const {
if (Constraint.size() == 1) {
// GCC RS6000 Constraint Letters
switch (Constraint[0]) {
case 'l':
// FIXME: in thumb mode, 'l' is only low-regs.
// FALL THROUGH.
case 'r':
return std::make_pair(0U, ARM::GPRRegisterClass);
case 'w':
if (VT == MVT::f32)
return std::make_pair(0U, ARM::SPRRegisterClass);
if (VT == MVT::f64)
return std::make_pair(0U, ARM::DPRRegisterClass);
break;
}
}
return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
}
std::vector<unsigned> ARMTargetLowering::
getRegClassForInlineAsmConstraint(const std::string &Constraint,
MVT VT) const {
if (Constraint.size() != 1)
return std::vector<unsigned>();
switch (Constraint[0]) { // GCC ARM Constraint Letters
default: break;
case 'l':
case 'r':
return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
ARM::R4, ARM::R5, ARM::R6, ARM::R7,
ARM::R8, ARM::R9, ARM::R10, ARM::R11,
ARM::R12, ARM::LR, 0);
case 'w':
if (VT == MVT::f32)
return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
ARM::S4, ARM::S5, ARM::S6, ARM::S7,
ARM::S8, ARM::S9, ARM::S10, ARM::S11,
ARM::S12,ARM::S13,ARM::S14,ARM::S15,
ARM::S16,ARM::S17,ARM::S18,ARM::S19,
ARM::S20,ARM::S21,ARM::S22,ARM::S23,
ARM::S24,ARM::S25,ARM::S26,ARM::S27,
ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
if (VT == MVT::f64)
return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
ARM::D4, ARM::D5, ARM::D6, ARM::D7,
ARM::D8, ARM::D9, ARM::D10,ARM::D11,
ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
break;
}
return std::vector<unsigned>();
}
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