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[GlobalISel] Call setInstrAndDebugLoc before tryCombineAll
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This can remove all unnecessary redundant calls in each combiner.
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@shiltian
shiltian committed Mar 29, 2024
1 parent 0dbd804 commit 586deed
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Showing 3 changed files with 9 additions and 57 deletions.
62 changes: 5 additions & 57 deletions llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -872,7 +872,6 @@ bool CombinerHelper::matchSextTruncSextLoad(MachineInstr &MI) {

void CombinerHelper::applySextTruncSextLoad(MachineInstr &MI) {
assert(MI.getOpcode() == TargetOpcode::G_SEXT_INREG);
Builder.setInstrAndDebugLoc(MI);
Builder.buildCopy(MI.getOperand(0).getReg(), MI.getOperand(1).getReg());
MI.eraseFromParent();
}
Expand Down Expand Up @@ -1299,7 +1298,6 @@ bool CombinerHelper::matchCombineIndexedLoadStore(
void CombinerHelper::applyCombineIndexedLoadStore(
MachineInstr &MI, IndexedLoadStoreMatchInfo &MatchInfo) {
MachineInstr &AddrDef = *MRI.getUniqueVRegDef(MatchInfo.Addr);
Builder.setInstrAndDebugLoc(MI);
unsigned Opcode = MI.getOpcode();
bool IsStore = Opcode == TargetOpcode::G_STORE;
unsigned NewOpcode = getIndexedOpc(Opcode);
Expand Down Expand Up @@ -1416,14 +1414,8 @@ void CombinerHelper::applyCombineDivRem(MachineInstr &MI,
// deps by "moving" the instruction incorrectly. Also keep track of which
// instruction is first so we pick it's operands, avoiding use-before-def
// bugs.
MachineInstr *FirstInst;
if (dominates(MI, *OtherMI)) {
Builder.setInstrAndDebugLoc(MI);
FirstInst = &MI;
} else {
Builder.setInstrAndDebugLoc(*OtherMI);
FirstInst = OtherMI;
}
MachineInstr *FirstInst = dominates(MI, *OtherMI) ? &MI : OtherMI;
Builder.setInstrAndDebugLoc(*FirstInst);

Builder.buildInstr(IsSigned ? TargetOpcode::G_SDIVREM
: TargetOpcode::G_UDIVREM,
Expand Down Expand Up @@ -1556,7 +1548,6 @@ static APFloat constantFoldFpUnary(const MachineInstr &MI,

void CombinerHelper::applyCombineConstantFoldFpUnary(MachineInstr &MI,
const ConstantFP *Cst) {
Builder.setInstrAndDebugLoc(MI);
APFloat Folded = constantFoldFpUnary(MI, MRI, Cst->getValue());
const ConstantFP *NewCst = ConstantFP::get(Builder.getContext(), Folded);
Builder.buildFConstant(MI.getOperand(0), *NewCst);
Expand Down Expand Up @@ -1691,7 +1682,6 @@ void CombinerHelper::applyShiftImmedChain(MachineInstr &MI,
Opcode == TargetOpcode::G_USHLSAT) &&
"Expected G_SHL, G_ASHR, G_LSHR, G_SSHLSAT or G_USHLSAT");

Builder.setInstrAndDebugLoc(MI);
LLT Ty = MRI.getType(MI.getOperand(1).getReg());
unsigned const ScalarSizeInBits = Ty.getScalarSizeInBits();
auto Imm = MatchInfo.Imm;
Expand Down Expand Up @@ -1807,7 +1797,6 @@ void CombinerHelper::applyShiftOfShiftedLogic(MachineInstr &MI,

LLT ShlType = MRI.getType(MI.getOperand(2).getReg());
LLT DestType = MRI.getType(MI.getOperand(0).getReg());
Builder.setInstrAndDebugLoc(MI);

Register Const = Builder.buildConstant(ShlType, MatchInfo.ValSum).getReg(0);

Expand Down Expand Up @@ -1943,7 +1932,6 @@ void CombinerHelper::applyCombineShlOfExtend(MachineInstr &MI,
int64_t ShiftAmtVal = MatchData.Imm;

LLT ExtSrcTy = MRI.getType(ExtSrcReg);
Builder.setInstrAndDebugLoc(MI);
auto ShiftAmt = Builder.buildConstant(ExtSrcTy, ShiftAmtVal);
auto NarrowShift =
Builder.buildShl(ExtSrcTy, ExtSrcReg, ShiftAmt, MI.getFlags());
Expand Down Expand Up @@ -2013,7 +2001,6 @@ void CombinerHelper::applyCombineUnmergeMergeToPlainValues(
LLT SrcTy = MRI.getType(Operands[0]);
LLT DstTy = MRI.getType(MI.getOperand(0).getReg());
bool CanReuseInputDirectly = DstTy == SrcTy;
Builder.setInstrAndDebugLoc(MI);
for (unsigned Idx = 0; Idx < NumElems; ++Idx) {
Register DstReg = MI.getOperand(Idx).getReg();
Register SrcReg = Operands[Idx];
Expand Down Expand Up @@ -2066,7 +2053,6 @@ void CombinerHelper::applyCombineUnmergeConstant(MachineInstr &MI,
assert((MI.getNumOperands() - 1 == Csts.size()) &&
"Not enough operands to replace all defs");
unsigned NumElems = MI.getNumOperands() - 1;
Builder.setInstrAndDebugLoc(MI);
for (unsigned Idx = 0; Idx < NumElems; ++Idx) {
Register DstReg = MI.getOperand(Idx).getReg();
Builder.buildConstant(DstReg, Csts[Idx]);
Expand Down Expand Up @@ -2104,7 +2090,6 @@ bool CombinerHelper::matchCombineUnmergeWithDeadLanesToTrunc(MachineInstr &MI) {
}

void CombinerHelper::applyCombineUnmergeWithDeadLanesToTrunc(MachineInstr &MI) {
Builder.setInstrAndDebugLoc(MI);
Register SrcReg = MI.getOperand(MI.getNumDefs()).getReg();
Register Dst0Reg = MI.getOperand(0).getReg();
Builder.buildTrunc(Dst0Reg, SrcReg);
Expand Down Expand Up @@ -2152,8 +2137,6 @@ void CombinerHelper::applyCombineUnmergeZExtToZExt(MachineInstr &MI) {
LLT Dst0Ty = MRI.getType(Dst0Reg);
LLT ZExtSrcTy = MRI.getType(ZExtSrcReg);

Builder.setInstrAndDebugLoc(MI);

if (Dst0Ty.getSizeInBits() > ZExtSrcTy.getSizeInBits()) {
Builder.buildZExt(Dst0Reg, ZExtSrcReg);
} else {
Expand Down Expand Up @@ -2207,7 +2190,6 @@ void CombinerHelper::applyCombineShiftToUnmerge(MachineInstr &MI,

LLT HalfTy = LLT::scalar(HalfSize);

Builder.setInstr(MI);
auto Unmerge = Builder.buildUnmerge(HalfTy, SrcReg);
unsigned NarrowShiftAmt = ShiftVal - HalfSize;

Expand Down Expand Up @@ -2292,15 +2274,13 @@ bool CombinerHelper::matchCombineI2PToP2I(MachineInstr &MI, Register &Reg) {
void CombinerHelper::applyCombineI2PToP2I(MachineInstr &MI, Register &Reg) {
assert(MI.getOpcode() == TargetOpcode::G_INTTOPTR && "Expected a G_INTTOPTR");
Register DstReg = MI.getOperand(0).getReg();
Builder.setInstr(MI);
Builder.buildCopy(DstReg, Reg);
MI.eraseFromParent();
}

void CombinerHelper::applyCombineP2IToI2P(MachineInstr &MI, Register &Reg) {
assert(MI.getOpcode() == TargetOpcode::G_PTRTOINT && "Expected a G_PTRTOINT");
Register DstReg = MI.getOperand(0).getReg();
Builder.setInstr(MI);
Builder.buildZExtOrTrunc(DstReg, Reg);
MI.eraseFromParent();
}
Expand Down Expand Up @@ -2343,7 +2323,6 @@ void CombinerHelper::applyCombineAddP2IToPtrAdd(

LLT PtrTy = MRI.getType(LHS);

Builder.setInstrAndDebugLoc(MI);
auto PtrAdd = Builder.buildPtrAdd(PtrTy, LHS, RHS);
Builder.buildPtrToInt(Dst, PtrAdd);
MI.eraseFromParent();
Expand Down Expand Up @@ -2375,7 +2354,6 @@ void CombinerHelper::applyCombineConstPtrAddToI2P(MachineInstr &MI,
auto &PtrAdd = cast<GPtrAdd>(MI);
Register Dst = PtrAdd.getReg(0);

Builder.setInstrAndDebugLoc(MI);
Builder.buildConstant(Dst, NewCst);
PtrAdd.eraseFromParent();
}
Expand Down Expand Up @@ -2455,7 +2433,6 @@ void CombinerHelper::applyCombineExtOfExt(
(MI.getOpcode() == TargetOpcode::G_SEXT &&
SrcExtOp == TargetOpcode::G_ZEXT)) {
Register DstReg = MI.getOperand(0).getReg();
Builder.setInstrAndDebugLoc(MI);
Builder.buildInstr(SrcExtOp, {DstReg}, {Reg});
MI.eraseFromParent();
}
Expand Down Expand Up @@ -2488,7 +2465,6 @@ void CombinerHelper::applyCombineTruncOfExt(
replaceRegWith(MRI, DstReg, SrcReg);
return;
}
Builder.setInstrAndDebugLoc(MI);
if (SrcTy.getSizeInBits() < DstTy.getSizeInBits())
Builder.buildInstr(SrcExtOp, {DstReg}, {SrcReg});
else
Expand Down Expand Up @@ -2576,8 +2552,6 @@ bool CombinerHelper::matchCombineTruncOfShift(

void CombinerHelper::applyCombineTruncOfShift(
MachineInstr &MI, std::pair<MachineInstr *, LLT> &MatchInfo) {
Builder.setInstrAndDebugLoc(MI);

MachineInstr *ShiftMI = MatchInfo.first;
LLT NewShiftTy = MatchInfo.second;

Expand Down Expand Up @@ -2823,7 +2797,6 @@ void CombinerHelper::applyFunnelShiftConstantModulo(MachineInstr &MI) {
APInt NewConst = VRegAndVal->Value.urem(
APInt(ConstTy.getSizeInBits(), DstTy.getScalarSizeInBits()));

Builder.setInstrAndDebugLoc(MI);
auto NewConstInstr = Builder.buildConstant(ConstTy, NewConst.getZExtValue());
Builder.buildInstr(
MI.getOpcode(), {MI.getOperand(0)},
Expand Down Expand Up @@ -2866,35 +2839,31 @@ bool CombinerHelper::matchOperandIsKnownToBeAPowerOfTwo(MachineInstr &MI,

void CombinerHelper::replaceInstWithFConstant(MachineInstr &MI, double C) {
assert(MI.getNumDefs() == 1 && "Expected only one def?");
Builder.setInstr(MI);
Builder.buildFConstant(MI.getOperand(0), C);
MI.eraseFromParent();
}

void CombinerHelper::replaceInstWithConstant(MachineInstr &MI, int64_t C) {
assert(MI.getNumDefs() == 1 && "Expected only one def?");
Builder.setInstr(MI);
Builder.buildConstant(MI.getOperand(0), C);
MI.eraseFromParent();
}

void CombinerHelper::replaceInstWithConstant(MachineInstr &MI, APInt C) {
assert(MI.getNumDefs() == 1 && "Expected only one def?");
Builder.setInstr(MI);
Builder.buildConstant(MI.getOperand(0), C);
MI.eraseFromParent();
}

void CombinerHelper::replaceInstWithFConstant(MachineInstr &MI, ConstantFP *CFP) {
void CombinerHelper::replaceInstWithFConstant(MachineInstr &MI,
ConstantFP *CFP) {
assert(MI.getNumDefs() == 1 && "Expected only one def?");
Builder.setInstr(MI);
Builder.buildFConstant(MI.getOperand(0), CFP->getValueAPF());
MI.eraseFromParent();
}

void CombinerHelper::replaceInstWithUndef(MachineInstr &MI) {
assert(MI.getNumDefs() == 1 && "Expected only one def?");
Builder.setInstr(MI);
Builder.buildUndef(MI.getOperand(0));
MI.eraseFromParent();
}
Expand Down Expand Up @@ -2962,7 +2931,6 @@ bool CombinerHelper::matchCombineInsertVecElts(

void CombinerHelper::applyCombineInsertVecElts(
MachineInstr &MI, SmallVectorImpl<Register> &MatchInfo) {
Builder.setInstr(MI);
Register UndefReg;
auto GetUndef = [&]() {
if (UndefReg)
Expand All @@ -2981,7 +2949,6 @@ void CombinerHelper::applyCombineInsertVecElts(

void CombinerHelper::applySimplifyAddToSub(
MachineInstr &MI, std::tuple<Register, Register> &MatchInfo) {
Builder.setInstr(MI);
Register SubLHS, SubRHS;
std::tie(SubLHS, SubRHS) = MatchInfo;
Builder.buildSub(MI.getOperand(0).getReg(), SubLHS, SubRHS);
Expand Down Expand Up @@ -3084,7 +3051,6 @@ void CombinerHelper::applyBuildInstructionSteps(
MachineInstr &MI, InstructionStepsMatchInfo &MatchInfo) {
assert(MatchInfo.InstrsToBuild.size() &&
"Expected at least one instr to build?");
Builder.setInstr(MI);
for (auto &InstrToBuild : MatchInfo.InstrsToBuild) {
assert(InstrToBuild.Opcode && "Expected a valid opcode?");
assert(InstrToBuild.OperandFns.size() && "Expected at least one operand?");
Expand Down Expand Up @@ -3120,7 +3086,6 @@ void CombinerHelper::applyAshShlToSextInreg(
int64_t ShiftAmt;
std::tie(Src, ShiftAmt) = MatchInfo;
unsigned Size = MRI.getType(Src).getScalarSizeInBits();
Builder.setInstrAndDebugLoc(MI);
Builder.buildSExtInReg(MI.getOperand(0).getReg(), Src, Size - ShiftAmt);
MI.eraseFromParent();
}
Expand Down Expand Up @@ -3399,7 +3364,6 @@ bool CombinerHelper::matchXorOfAndWithSameReg(
void CombinerHelper::applyXorOfAndWithSameReg(
MachineInstr &MI, std::pair<Register, Register> &MatchInfo) {
// Fold (xor (and x, y), y) -> (and (not x), y)
Builder.setInstrAndDebugLoc(MI);
Register X, Y;
std::tie(X, Y) = MatchInfo;
auto Not = Builder.buildNot(MRI.getType(X), X);
Expand Down Expand Up @@ -3431,7 +3395,6 @@ bool CombinerHelper::matchPtrAddZero(MachineInstr &MI) {

void CombinerHelper::applyPtrAddZero(MachineInstr &MI) {
auto &PtrAdd = cast<GPtrAdd>(MI);
Builder.setInstrAndDebugLoc(PtrAdd);
Builder.buildIntToPtr(PtrAdd.getReg(0), PtrAdd.getOffsetReg());
PtrAdd.eraseFromParent();
}
Expand All @@ -3442,7 +3405,6 @@ void CombinerHelper::applySimplifyURemByPow2(MachineInstr &MI) {
Register Src0 = MI.getOperand(1).getReg();
Register Pow2Src1 = MI.getOperand(2).getReg();
LLT Ty = MRI.getType(DstReg);
Builder.setInstrAndDebugLoc(MI);

// Fold (urem x, pow2) -> (and x, pow2-1)
auto NegOne = Builder.buildConstant(Ty, -1);
Expand Down Expand Up @@ -3507,8 +3469,6 @@ bool CombinerHelper::matchFoldBinOpIntoSelect(MachineInstr &MI,
/// to fold.
void CombinerHelper::applyFoldBinOpIntoSelect(MachineInstr &MI,
const unsigned &SelectOperand) {
Builder.setInstrAndDebugLoc(MI);

Register Dst = MI.getOperand(0).getReg();
Register LHS = MI.getOperand(1).getReg();
Register RHS = MI.getOperand(2).getReg();
Expand Down Expand Up @@ -4029,7 +3989,6 @@ void CombinerHelper::applyExtractVecEltBuildVec(MachineInstr &MI,
Register DstReg = MI.getOperand(0).getReg();
LLT DstTy = MRI.getType(DstReg);

Builder.setInstrAndDebugLoc(MI);
if (ScalarTy != DstTy) {
assert(ScalarTy.getSizeInBits() > DstTy.getSizeInBits());
Builder.buildTrunc(DstReg, Reg);
Expand Down Expand Up @@ -4095,14 +4054,12 @@ void CombinerHelper::applyExtractAllEltsFromBuildVector(

void CombinerHelper::applyBuildFn(
MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) {
Builder.setInstrAndDebugLoc(MI);
MatchInfo(Builder);
applyBuildFnNoErase(MI, MatchInfo);
MI.eraseFromParent();
}

void CombinerHelper::applyBuildFnNoErase(
MachineInstr &MI, std::function<void(MachineIRBuilder &)> &MatchInfo) {
Builder.setInstrAndDebugLoc(MI);
MatchInfo(Builder);
}

Expand Down Expand Up @@ -4204,7 +4161,6 @@ void CombinerHelper::applyRotateOutOfRange(MachineInstr &MI) {
MI.getOpcode() == TargetOpcode::G_ROTR);
unsigned Bitsize =
MRI.getType(MI.getOperand(0).getReg()).getScalarSizeInBits();
Builder.setInstrAndDebugLoc(MI);
Register Amt = MI.getOperand(2).getReg();
LLT AmtTy = MRI.getType(Amt);
auto Bits = Builder.buildConstant(AmtTy, Bitsize);
Expand Down Expand Up @@ -5027,7 +4983,6 @@ MachineInstr *CombinerHelper::buildUDivUsingMul(MachineInstr &MI) {
LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(Ty);
LLT ScalarShiftAmtTy = ShiftAmtTy.getScalarType();
auto &MIB = Builder;
MIB.setInstrAndDebugLoc(MI);

bool UseNPQ = false;
SmallVector<Register, 16> PreShifts, PostShifts, MagicFactors, NPQFactors;
Expand Down Expand Up @@ -5213,7 +5168,6 @@ MachineInstr *CombinerHelper::buildSDivUsingMul(MachineInstr &MI) {
LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(Ty);
LLT ScalarShiftAmtTy = ShiftAmtTy.getScalarType();
auto &MIB = Builder;
MIB.setInstrAndDebugLoc(MI);

bool UseSRA = false;
SmallVector<Register, 16> Shifts, Factors;
Expand Down Expand Up @@ -5295,8 +5249,6 @@ void CombinerHelper::applySDivByPow2(MachineInstr &MI) {
LLT CCVT =
Ty.isVector() ? LLT::vector(Ty.getElementCount(), 1) : LLT::scalar(1);

Builder.setInstrAndDebugLoc(MI);

// Effectively we want to lower G_SDIV %lhs, %rhs, where %rhs is a power of 2,
// to the following version:
//
Expand Down Expand Up @@ -5354,8 +5306,6 @@ void CombinerHelper::applyUDivByPow2(MachineInstr &MI) {
LLT Ty = MRI.getType(Dst);
LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(Ty);

Builder.setInstrAndDebugLoc(MI);

auto C1 = Builder.buildCTTZ(ShiftAmtTy, RHS);
Builder.buildLShr(MI.getOperand(0).getReg(), LHS, C1);
MI.eraseFromParent();
Expand Down Expand Up @@ -5385,7 +5335,6 @@ void CombinerHelper::applyUMulHToLShr(MachineInstr &MI) {
LLT ShiftAmtTy = getTargetLowering().getPreferredShiftAmountTy(Ty);
unsigned NumEltBits = Ty.getScalarSizeInBits();

Builder.setInstrAndDebugLoc(MI);
auto LogBase2 = buildLogBase2(RHS, Builder);
auto ShiftAmt =
Builder.buildSub(Ty, Builder.buildConstant(Ty, NumEltBits), LogBase2);
Expand Down Expand Up @@ -5465,7 +5414,6 @@ bool CombinerHelper::matchFsubToFneg(MachineInstr &MI, Register &MatchInfo) {
}

void CombinerHelper::applyFsubToFneg(MachineInstr &MI, Register &MatchInfo) {
Builder.setInstrAndDebugLoc(MI);
Register Dst = MI.getOperand(0).getReg();
Builder.buildFNeg(
Dst, Builder.buildFCanonicalize(MRI.getType(Dst), MatchInfo).getReg(0));
Expand Down
3 changes: 3 additions & 0 deletions llvm/test/TableGen/GlobalISelCombinerEmitter/match-table.td
View file
Original file line number Diff line number Diff line change
Expand Up @@ -114,14 +114,17 @@ def MyCombiner: GICombiner<"GenMyCombiner", [
// CHECK-NEXT: void GenMyCombiner::runCustomAction(unsigned ApplyID, const MatcherState &State, NewMIVector &OutMIs) const {
// CHECK-NEXT: switch(ApplyID) {
// CHECK-NEXT: case GICXXCustomAction_CombineApplyGICombiner0:{
// CHECK-NEXT: Helper.getBuilder().setInstrAndDebugLoc(*State.MIs[0]);
// CHECK-NEXT: APPLY
// CHECK-NEXT: return;
// CHECK-NEXT: }
// CHECK-NEXT: case GICXXCustomAction_CombineApplyGICombiner1:{
// CHECK-NEXT: Helper.getBuilder().setInstrAndDebugLoc(*State.MIs[0]);
// CHECK-NEXT: APPLY MatchInfos.MDInfo0, MatchInfos.MDInfo1
// CHECK-NEXT: return;
// CHECK-NEXT: }
// CHECK-NEXT: case GICXXCustomAction_CombineApplyGICombiner2:{
// CHECK-NEXT: Helper.getBuilder().setInstrAndDebugLoc(*State.MIs[0]);
// CHECK-NEXT: APPLY State.MIs[1]->getOperand(1) State.MIs[0]->getOperand(1) OutMIs[0]
// CHECK-NEXT: return;
// CHECK-NEXT: }
Expand Down
1 change: 1 addition & 0 deletions llvm/utils/TableGen/GlobalISelCombinerEmitter.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2459,6 +2459,7 @@ void GICombinerEmitter::emitRunCustomAction(raw_ostream &OS) {
OS << " switch(ApplyID) {\n";
for (const auto &Apply : ApplyCode) {
OS << " case " << Apply->getEnumNameWithPrefix(CXXApplyPrefix) << ":{\n"
<< " Helper.getBuilder().setInstrAndDebugLoc(*State.MIs[0]);\n"
<< " " << join(split(Apply->Code, '\n'), "\n ") << '\n'
<< " return;\n";
OS << " }\n";
Expand Down

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