llvm-project/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp

731 lines
25 KiB
C++

///===-- FastISel.cpp - Implementation of the FastISel class --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the implementation of the FastISel class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Instructions.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
unsigned FastISel::getRegForValue(Value *V) {
// Look up the value to see if we already have a register for it. We
// cache values defined by Instructions across blocks, and other values
// only locally. This is because Instructions already have the SSA
// def-dominatess-use requirement enforced.
if (ValueMap.count(V))
return ValueMap[V];
unsigned Reg = LocalValueMap[V];
if (Reg != 0)
return Reg;
MVT::SimpleValueType VT = TLI.getValueType(V->getType()).getSimpleVT();
// Ignore illegal types.
if (!TLI.isTypeLegal(VT)) {
// Promote MVT::i1 to a legal type though, because it's common and easy.
if (VT == MVT::i1)
VT = TLI.getTypeToTransformTo(VT).getSimpleVT();
else
return 0;
}
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
if (CI->getValue().getActiveBits() > 64)
return TargetMaterializeConstant(CI);
// Don't cache constant materializations. To do so would require
// tracking what uses they dominate.
Reg = FastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
} else if (isa<GlobalValue>(V)) {
return TargetMaterializeConstant(cast<Constant>(V));
} else if (isa<AllocaInst>(V)) {
return TargetMaterializeAlloca(cast<AllocaInst>(V));
} else if (isa<ConstantPointerNull>(V)) {
Reg = FastEmit_i(VT, VT, ISD::Constant, 0);
} else if (ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
if (!Reg) {
const APFloat &Flt = CF->getValueAPF();
MVT IntVT = TLI.getPointerTy();
uint64_t x[2];
uint32_t IntBitWidth = IntVT.getSizeInBits();
if (Flt.convertToInteger(x, IntBitWidth, /*isSigned=*/true,
APFloat::rmTowardZero) != APFloat::opOK)
return TargetMaterializeConstant(CF);
APInt IntVal(IntBitWidth, 2, x);
unsigned IntegerReg = FastEmit_i(IntVT.getSimpleVT(), IntVT.getSimpleVT(),
ISD::Constant, IntVal.getZExtValue());
if (IntegerReg == 0)
return TargetMaterializeConstant(CF);
Reg = FastEmit_r(IntVT.getSimpleVT(), VT, ISD::SINT_TO_FP, IntegerReg);
if (Reg == 0)
return TargetMaterializeConstant(CF);
}
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
if (!SelectOperator(CE, CE->getOpcode())) return 0;
Reg = LocalValueMap[CE];
} else if (isa<UndefValue>(V)) {
Reg = createResultReg(TLI.getRegClassFor(VT));
BuildMI(MBB, TII.get(TargetInstrInfo::IMPLICIT_DEF), Reg);
} else {
return 0;
}
if (!Reg && isa<Constant>(V))
return TargetMaterializeConstant(cast<Constant>(V));
LocalValueMap[V] = Reg;
return Reg;
}
unsigned FastISel::lookUpRegForValue(Value *V) {
// Look up the value to see if we already have a register for it. We
// cache values defined by Instructions across blocks, and other values
// only locally. This is because Instructions already have the SSA
// def-dominatess-use requirement enforced.
if (ValueMap.count(V))
return ValueMap[V];
return LocalValueMap[V];
}
/// UpdateValueMap - Update the value map to include the new mapping for this
/// instruction, or insert an extra copy to get the result in a previous
/// determined register.
/// NOTE: This is only necessary because we might select a block that uses
/// a value before we select the block that defines the value. It might be
/// possible to fix this by selecting blocks in reverse postorder.
void FastISel::UpdateValueMap(Value* I, unsigned Reg) {
if (!isa<Instruction>(I)) {
LocalValueMap[I] = Reg;
return;
}
if (!ValueMap.count(I))
ValueMap[I] = Reg;
else
TII.copyRegToReg(*MBB, MBB->end(), ValueMap[I],
Reg, MRI.getRegClass(Reg), MRI.getRegClass(Reg));
}
/// SelectBinaryOp - Select and emit code for a binary operator instruction,
/// which has an opcode which directly corresponds to the given ISD opcode.
///
bool FastISel::SelectBinaryOp(User *I, ISD::NodeType ISDOpcode) {
MVT VT = MVT::getMVT(I->getType(), /*HandleUnknown=*/true);
if (VT == MVT::Other || !VT.isSimple())
// Unhandled type. Halt "fast" selection and bail.
return false;
// We only handle legal types. For example, on x86-32 the instruction
// selector contains all of the 64-bit instructions from x86-64,
// under the assumption that i64 won't be used if the target doesn't
// support it.
if (!TLI.isTypeLegal(VT)) {
// MVT::i1 is special. Allow AND and OR (but not XOR) because they
// don't require additional zeroing, which makes them easy.
if (VT == MVT::i1 &&
(ISDOpcode == ISD::AND || ISDOpcode == ISD::OR))
VT = TLI.getTypeToTransformTo(VT);
else
return false;
}
unsigned Op0 = getRegForValue(I->getOperand(0));
if (Op0 == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
// Check if the second operand is a constant and handle it appropriately.
if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
unsigned ResultReg = FastEmit_ri(VT.getSimpleVT(), VT.getSimpleVT(),
ISDOpcode, Op0, CI->getZExtValue());
if (ResultReg != 0) {
// We successfully emitted code for the given LLVM Instruction.
UpdateValueMap(I, ResultReg);
return true;
}
}
// Check if the second operand is a constant float.
if (ConstantFP *CF = dyn_cast<ConstantFP>(I->getOperand(1))) {
unsigned ResultReg = FastEmit_rf(VT.getSimpleVT(), VT.getSimpleVT(),
ISDOpcode, Op0, CF);
if (ResultReg != 0) {
// We successfully emitted code for the given LLVM Instruction.
UpdateValueMap(I, ResultReg);
return true;
}
}
unsigned Op1 = getRegForValue(I->getOperand(1));
if (Op1 == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
// Now we have both operands in registers. Emit the instruction.
unsigned ResultReg = FastEmit_rr(VT.getSimpleVT(), VT.getSimpleVT(),
ISDOpcode, Op0, Op1);
if (ResultReg == 0)
// Target-specific code wasn't able to find a machine opcode for
// the given ISD opcode and type. Halt "fast" selection and bail.
return false;
// We successfully emitted code for the given LLVM Instruction.
UpdateValueMap(I, ResultReg);
return true;
}
bool FastISel::SelectGetElementPtr(User *I) {
unsigned N = getRegForValue(I->getOperand(0));
if (N == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
const Type *Ty = I->getOperand(0)->getType();
MVT::SimpleValueType VT = TLI.getPointerTy().getSimpleVT();
for (GetElementPtrInst::op_iterator OI = I->op_begin()+1, E = I->op_end();
OI != E; ++OI) {
Value *Idx = *OI;
if (const StructType *StTy = dyn_cast<StructType>(Ty)) {
unsigned Field = cast<ConstantInt>(Idx)->getZExtValue();
if (Field) {
// N = N + Offset
uint64_t Offs = TD.getStructLayout(StTy)->getElementOffset(Field);
// FIXME: This can be optimized by combining the add with a
// subsequent one.
N = FastEmit_ri_(VT, ISD::ADD, N, Offs, VT);
if (N == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
}
Ty = StTy->getElementType(Field);
} else {
Ty = cast<SequentialType>(Ty)->getElementType();
// If this is a constant subscript, handle it quickly.
if (ConstantInt *CI = dyn_cast<ConstantInt>(Idx)) {
if (CI->getZExtValue() == 0) continue;
uint64_t Offs =
TD.getABITypeSize(Ty)*cast<ConstantInt>(CI)->getSExtValue();
N = FastEmit_ri_(VT, ISD::ADD, N, Offs, VT);
if (N == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
continue;
}
// N = N + Idx * ElementSize;
uint64_t ElementSize = TD.getABITypeSize(Ty);
unsigned IdxN = getRegForValue(Idx);
if (IdxN == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
// If the index is smaller or larger than intptr_t, truncate or extend
// it.
MVT IdxVT = MVT::getMVT(Idx->getType(), /*HandleUnknown=*/false);
if (IdxVT.bitsLT(VT))
IdxN = FastEmit_r(IdxVT.getSimpleVT(), VT, ISD::SIGN_EXTEND, IdxN);
else if (IdxVT.bitsGT(VT))
IdxN = FastEmit_r(IdxVT.getSimpleVT(), VT, ISD::TRUNCATE, IdxN);
if (IdxN == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
if (ElementSize != 1) {
IdxN = FastEmit_ri_(VT, ISD::MUL, IdxN, ElementSize, VT);
if (IdxN == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
}
N = FastEmit_rr(VT, VT, ISD::ADD, N, IdxN);
if (N == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
}
}
// We successfully emitted code for the given LLVM Instruction.
UpdateValueMap(I, N);
return true;
}
bool FastISel::SelectCast(User *I, ISD::NodeType Opcode) {
MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
MVT DstVT = TLI.getValueType(I->getType());
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
DstVT == MVT::Other || !DstVT.isSimple() ||
!TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT))
// Unhandled type. Halt "fast" selection and bail.
return false;
unsigned InputReg = getRegForValue(I->getOperand(0));
if (!InputReg)
// Unhandled operand. Halt "fast" selection and bail.
return false;
unsigned ResultReg = FastEmit_r(SrcVT.getSimpleVT(),
DstVT.getSimpleVT(),
Opcode,
InputReg);
if (!ResultReg)
return false;
UpdateValueMap(I, ResultReg);
return true;
}
bool FastISel::SelectBitCast(User *I) {
// If the bitcast doesn't change the type, just use the operand value.
if (I->getType() == I->getOperand(0)->getType()) {
unsigned Reg = getRegForValue(I->getOperand(0));
if (Reg == 0)
return false;
UpdateValueMap(I, Reg);
return true;
}
// Bitcasts of other values become reg-reg copies or BIT_CONVERT operators.
MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
MVT DstVT = TLI.getValueType(I->getType());
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
DstVT == MVT::Other || !DstVT.isSimple() ||
!TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT))
// Unhandled type. Halt "fast" selection and bail.
return false;
unsigned Op0 = getRegForValue(I->getOperand(0));
if (Op0 == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
// First, try to perform the bitcast by inserting a reg-reg copy.
unsigned ResultReg = 0;
if (SrcVT.getSimpleVT() == DstVT.getSimpleVT()) {
TargetRegisterClass* SrcClass = TLI.getRegClassFor(SrcVT);
TargetRegisterClass* DstClass = TLI.getRegClassFor(DstVT);
ResultReg = createResultReg(DstClass);
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
Op0, DstClass, SrcClass);
if (!InsertedCopy)
ResultReg = 0;
}
// If the reg-reg copy failed, select a BIT_CONVERT opcode.
if (!ResultReg)
ResultReg = FastEmit_r(SrcVT.getSimpleVT(), DstVT.getSimpleVT(),
ISD::BIT_CONVERT, Op0);
if (!ResultReg)
return false;
UpdateValueMap(I, ResultReg);
return true;
}
bool
FastISel::SelectInstruction(Instruction *I) {
return SelectOperator(I, I->getOpcode());
}
bool
FastISel::SelectOperator(User *I, unsigned Opcode) {
switch (Opcode) {
case Instruction::Add: {
ISD::NodeType Opc = I->getType()->isFPOrFPVector() ? ISD::FADD : ISD::ADD;
return SelectBinaryOp(I, Opc);
}
case Instruction::Sub: {
ISD::NodeType Opc = I->getType()->isFPOrFPVector() ? ISD::FSUB : ISD::SUB;
return SelectBinaryOp(I, Opc);
}
case Instruction::Mul: {
ISD::NodeType Opc = I->getType()->isFPOrFPVector() ? ISD::FMUL : ISD::MUL;
return SelectBinaryOp(I, Opc);
}
case Instruction::SDiv:
return SelectBinaryOp(I, ISD::SDIV);
case Instruction::UDiv:
return SelectBinaryOp(I, ISD::UDIV);
case Instruction::FDiv:
return SelectBinaryOp(I, ISD::FDIV);
case Instruction::SRem:
return SelectBinaryOp(I, ISD::SREM);
case Instruction::URem:
return SelectBinaryOp(I, ISD::UREM);
case Instruction::FRem:
return SelectBinaryOp(I, ISD::FREM);
case Instruction::Shl:
return SelectBinaryOp(I, ISD::SHL);
case Instruction::LShr:
return SelectBinaryOp(I, ISD::SRL);
case Instruction::AShr:
return SelectBinaryOp(I, ISD::SRA);
case Instruction::And:
return SelectBinaryOp(I, ISD::AND);
case Instruction::Or:
return SelectBinaryOp(I, ISD::OR);
case Instruction::Xor:
return SelectBinaryOp(I, ISD::XOR);
case Instruction::GetElementPtr:
return SelectGetElementPtr(I);
case Instruction::Br: {
BranchInst *BI = cast<BranchInst>(I);
if (BI->isUnconditional()) {
MachineFunction::iterator NextMBB =
next(MachineFunction::iterator(MBB));
BasicBlock *LLVMSucc = BI->getSuccessor(0);
MachineBasicBlock *MSucc = MBBMap[LLVMSucc];
if (NextMBB != MF.end() && MSucc == NextMBB) {
// The unconditional fall-through case, which needs no instructions.
} else {
// The unconditional branch case.
TII.InsertBranch(*MBB, MSucc, NULL, SmallVector<MachineOperand, 0>());
}
MBB->addSuccessor(MSucc);
return true;
}
// Conditional branches are not handed yet.
// Halt "fast" selection and bail.
return false;
}
case Instruction::Unreachable:
// Nothing to emit.
return true;
case Instruction::PHI:
// PHI nodes are already emitted.
return true;
case Instruction::Alloca:
// FunctionLowering has the static-sized case covered.
if (StaticAllocaMap.count(cast<AllocaInst>(I)))
return true;
// Dynamic-sized alloca is not handled yet.
return false;
case Instruction::BitCast:
return SelectBitCast(I);
case Instruction::FPToSI:
return SelectCast(I, ISD::FP_TO_SINT);
case Instruction::ZExt:
return SelectCast(I, ISD::ZERO_EXTEND);
case Instruction::SExt:
return SelectCast(I, ISD::SIGN_EXTEND);
case Instruction::Trunc:
return SelectCast(I, ISD::TRUNCATE);
case Instruction::SIToFP:
return SelectCast(I, ISD::SINT_TO_FP);
case Instruction::IntToPtr: // Deliberate fall-through.
case Instruction::PtrToInt: {
MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
MVT DstVT = TLI.getValueType(I->getType());
if (DstVT.bitsGT(SrcVT))
return SelectCast(I, ISD::ZERO_EXTEND);
if (DstVT.bitsLT(SrcVT))
return SelectCast(I, ISD::TRUNCATE);
unsigned Reg = getRegForValue(I->getOperand(0));
if (Reg == 0) return false;
UpdateValueMap(I, Reg);
return true;
}
default:
// Unhandled instruction. Halt "fast" selection and bail.
return false;
}
}
FastISel::FastISel(MachineFunction &mf,
DenseMap<const Value *, unsigned> &vm,
DenseMap<const BasicBlock *, MachineBasicBlock *> &bm,
DenseMap<const AllocaInst *, int> &am)
: MBB(0),
ValueMap(vm),
MBBMap(bm),
StaticAllocaMap(am),
MF(mf),
MRI(MF.getRegInfo()),
MFI(*MF.getFrameInfo()),
MCP(*MF.getConstantPool()),
TM(MF.getTarget()),
TD(*TM.getTargetData()),
TII(*TM.getInstrInfo()),
TLI(*TM.getTargetLowering()) {
}
FastISel::~FastISel() {}
unsigned FastISel::FastEmit_(MVT::SimpleValueType, MVT::SimpleValueType,
ISD::NodeType) {
return 0;
}
unsigned FastISel::FastEmit_r(MVT::SimpleValueType, MVT::SimpleValueType,
ISD::NodeType, unsigned /*Op0*/) {
return 0;
}
unsigned FastISel::FastEmit_rr(MVT::SimpleValueType, MVT::SimpleValueType,
ISD::NodeType, unsigned /*Op0*/,
unsigned /*Op0*/) {
return 0;
}
unsigned FastISel::FastEmit_i(MVT::SimpleValueType, MVT::SimpleValueType,
ISD::NodeType, uint64_t /*Imm*/) {
return 0;
}
unsigned FastISel::FastEmit_f(MVT::SimpleValueType, MVT::SimpleValueType,
ISD::NodeType, ConstantFP * /*FPImm*/) {
return 0;
}
unsigned FastISel::FastEmit_ri(MVT::SimpleValueType, MVT::SimpleValueType,
ISD::NodeType, unsigned /*Op0*/,
uint64_t /*Imm*/) {
return 0;
}
unsigned FastISel::FastEmit_rf(MVT::SimpleValueType, MVT::SimpleValueType,
ISD::NodeType, unsigned /*Op0*/,
ConstantFP * /*FPImm*/) {
return 0;
}
unsigned FastISel::FastEmit_rri(MVT::SimpleValueType, MVT::SimpleValueType,
ISD::NodeType,
unsigned /*Op0*/, unsigned /*Op1*/,
uint64_t /*Imm*/) {
return 0;
}
/// FastEmit_ri_ - This method is a wrapper of FastEmit_ri. It first tries
/// to emit an instruction with an immediate operand using FastEmit_ri.
/// If that fails, it materializes the immediate into a register and try
/// FastEmit_rr instead.
unsigned FastISel::FastEmit_ri_(MVT::SimpleValueType VT, ISD::NodeType Opcode,
unsigned Op0, uint64_t Imm,
MVT::SimpleValueType ImmType) {
// First check if immediate type is legal. If not, we can't use the ri form.
unsigned ResultReg = FastEmit_ri(VT, VT, Opcode, Op0, Imm);
if (ResultReg != 0)
return ResultReg;
unsigned MaterialReg = FastEmit_i(ImmType, ImmType, ISD::Constant, Imm);
if (MaterialReg == 0)
return 0;
return FastEmit_rr(VT, VT, Opcode, Op0, MaterialReg);
}
/// FastEmit_rf_ - This method is a wrapper of FastEmit_ri. It first tries
/// to emit an instruction with a floating-point immediate operand using
/// FastEmit_rf. If that fails, it materializes the immediate into a register
/// and try FastEmit_rr instead.
unsigned FastISel::FastEmit_rf_(MVT::SimpleValueType VT, ISD::NodeType Opcode,
unsigned Op0, ConstantFP *FPImm,
MVT::SimpleValueType ImmType) {
// First check if immediate type is legal. If not, we can't use the rf form.
unsigned ResultReg = FastEmit_rf(VT, VT, Opcode, Op0, FPImm);
if (ResultReg != 0)
return ResultReg;
// Materialize the constant in a register.
unsigned MaterialReg = FastEmit_f(ImmType, ImmType, ISD::ConstantFP, FPImm);
if (MaterialReg == 0) {
// If the target doesn't have a way to directly enter a floating-point
// value into a register, use an alternate approach.
// TODO: The current approach only supports floating-point constants
// that can be constructed by conversion from integer values. This should
// be replaced by code that creates a load from a constant-pool entry,
// which will require some target-specific work.
const APFloat &Flt = FPImm->getValueAPF();
MVT IntVT = TLI.getPointerTy();
uint64_t x[2];
uint32_t IntBitWidth = IntVT.getSizeInBits();
if (Flt.convertToInteger(x, IntBitWidth, /*isSigned=*/true,
APFloat::rmTowardZero) != APFloat::opOK)
return 0;
APInt IntVal(IntBitWidth, 2, x);
unsigned IntegerReg = FastEmit_i(IntVT.getSimpleVT(), IntVT.getSimpleVT(),
ISD::Constant, IntVal.getZExtValue());
if (IntegerReg == 0)
return 0;
MaterialReg = FastEmit_r(IntVT.getSimpleVT(), VT,
ISD::SINT_TO_FP, IntegerReg);
if (MaterialReg == 0)
return 0;
}
return FastEmit_rr(VT, VT, Opcode, Op0, MaterialReg);
}
unsigned FastISel::createResultReg(const TargetRegisterClass* RC) {
return MRI.createVirtualRegister(RC);
}
unsigned FastISel::FastEmitInst_(unsigned MachineInstOpcode,
const TargetRegisterClass* RC) {
unsigned ResultReg = createResultReg(RC);
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
BuildMI(MBB, II, ResultReg);
return ResultReg;
}
unsigned FastISel::FastEmitInst_r(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0) {
unsigned ResultReg = createResultReg(RC);
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
BuildMI(MBB, II, ResultReg).addReg(Op0);
else {
BuildMI(MBB, II).addReg(Op0);
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
II.ImplicitDefs[0], RC, RC);
if (!InsertedCopy)
ResultReg = 0;
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_rr(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, unsigned Op1) {
unsigned ResultReg = createResultReg(RC);
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
BuildMI(MBB, II, ResultReg).addReg(Op0).addReg(Op1);
else {
BuildMI(MBB, II).addReg(Op0).addReg(Op1);
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
II.ImplicitDefs[0], RC, RC);
if (!InsertedCopy)
ResultReg = 0;
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_ri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, uint64_t Imm) {
unsigned ResultReg = createResultReg(RC);
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
BuildMI(MBB, II, ResultReg).addReg(Op0).addImm(Imm);
else {
BuildMI(MBB, II).addReg(Op0).addImm(Imm);
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
II.ImplicitDefs[0], RC, RC);
if (!InsertedCopy)
ResultReg = 0;
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_rf(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, ConstantFP *FPImm) {
unsigned ResultReg = createResultReg(RC);
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
BuildMI(MBB, II, ResultReg).addReg(Op0).addFPImm(FPImm);
else {
BuildMI(MBB, II).addReg(Op0).addFPImm(FPImm);
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
II.ImplicitDefs[0], RC, RC);
if (!InsertedCopy)
ResultReg = 0;
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_rri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, unsigned Op1, uint64_t Imm) {
unsigned ResultReg = createResultReg(RC);
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
BuildMI(MBB, II, ResultReg).addReg(Op0).addReg(Op1).addImm(Imm);
else {
BuildMI(MBB, II).addReg(Op0).addReg(Op1).addImm(Imm);
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
II.ImplicitDefs[0], RC, RC);
if (!InsertedCopy)
ResultReg = 0;
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_i(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
uint64_t Imm) {
unsigned ResultReg = createResultReg(RC);
const TargetInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
BuildMI(MBB, II, ResultReg).addImm(Imm);
else {
BuildMI(MBB, II).addImm(Imm);
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
II.ImplicitDefs[0], RC, RC);
if (!InsertedCopy)
ResultReg = 0;
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_extractsubreg(unsigned Op0, uint32_t Idx) {
const TargetRegisterClass* RC = MRI.getRegClass(Op0);
const TargetRegisterClass* SRC = *(RC->subregclasses_begin()+Idx-1);
unsigned ResultReg = createResultReg(SRC);
const TargetInstrDesc &II = TII.get(TargetInstrInfo::EXTRACT_SUBREG);
if (II.getNumDefs() >= 1)
BuildMI(MBB, II, ResultReg).addReg(Op0).addImm(Idx);
else {
BuildMI(MBB, II).addReg(Op0).addImm(Idx);
bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
II.ImplicitDefs[0], RC, RC);
if (!InsertedCopy)
ResultReg = 0;
}
return ResultReg;
}