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//===- CombinerHelperCompares.cpp------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements CombinerHelper for G_ICMP.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
#include "llvm/CodeGen/GlobalISel/GenericMachineInstrs.h"
#include "llvm/CodeGen/GlobalISel/LegalizerHelper.h"
#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
#include "llvm/CodeGen/GlobalISel/Utils.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Instructions.h"
#include "llvm/Support/Casting.h"
#include <cstdlib>
#define DEBUG_TYPE "gi-combiner"
using namespace llvm;
bool CombinerHelper::constantFoldICmp(const GICmp &ICmp,
const GIConstant &LHSCst,
const GIConstant &RHSCst,
BuildFnTy &MatchInfo) const {
if (LHSCst.getKind() != GIConstant::GIConstantKind::Scalar)
return false;
Register Dst = ICmp.getReg(0);
LLT DstTy = MRI.getType(Dst);
if (!isConstantLegalOrBeforeLegalizer(DstTy))
return false;
CmpInst::Predicate Pred = ICmp.getCond();
APInt LHS = LHSCst.getScalarValue();
APInt RHS = RHSCst.getScalarValue();
bool Result = ICmpInst::compare(LHS, RHS, Pred);
MatchInfo = [=](MachineIRBuilder &B) {
if (Result)
B.buildConstant(Dst, getICmpTrueVal(getTargetLowering(),
/*IsVector=*/DstTy.isVector(),
/*IsFP=*/false));
else
B.buildConstant(Dst, 0);
};
return true;
}
bool CombinerHelper::constantFoldFCmp(const GFCmp &FCmp,
const GFConstant &LHSCst,
const GFConstant &RHSCst,
BuildFnTy &MatchInfo) const {
if (LHSCst.getKind() != GFConstant::GFConstantKind::Scalar)
return false;
Register Dst = FCmp.getReg(0);
LLT DstTy = MRI.getType(Dst);
if (!isConstantLegalOrBeforeLegalizer(DstTy))
return false;
CmpInst::Predicate Pred = FCmp.getCond();
APFloat LHS = LHSCst.getScalarValue();
APFloat RHS = RHSCst.getScalarValue();
bool Result = FCmpInst::compare(LHS, RHS, Pred);
MatchInfo = [=](MachineIRBuilder &B) {
if (Result)
B.buildConstant(Dst, getICmpTrueVal(getTargetLowering(),
/*IsVector=*/DstTy.isVector(),
/*IsFP=*/true));
else
B.buildConstant(Dst, 0);
};
return true;
}
bool CombinerHelper::matchCanonicalizeICmp(const MachineInstr &MI,
BuildFnTy &MatchInfo) const {
const GICmp *Cmp = cast<GICmp>(&MI);
Register Dst = Cmp->getReg(0);
Register LHS = Cmp->getLHSReg();
Register RHS = Cmp->getRHSReg();
CmpInst::Predicate Pred = Cmp->getCond();
assert(CmpInst::isIntPredicate(Pred) && "Not an integer compare!");
if (auto CLHS = GIConstant::getConstant(LHS, MRI)) {
if (auto CRHS = GIConstant::getConstant(RHS, MRI))
return constantFoldICmp(*Cmp, *CLHS, *CRHS, MatchInfo);
// If we have a constant, make sure it is on the RHS.
std::swap(LHS, RHS);
Pred = CmpInst::getSwappedPredicate(Pred);
MatchInfo = [=](MachineIRBuilder &B) { B.buildICmp(Pred, Dst, LHS, RHS); };
return true;
}
return false;
}
bool CombinerHelper::matchCanonicalizeFCmp(const MachineInstr &MI,
BuildFnTy &MatchInfo) const {
const GFCmp *Cmp = cast<GFCmp>(&MI);
Register Dst = Cmp->getReg(0);
Register LHS = Cmp->getLHSReg();
Register RHS = Cmp->getRHSReg();
CmpInst::Predicate Pred = Cmp->getCond();
assert(CmpInst::isFPPredicate(Pred) && "Not an FP compare!");
if (auto CLHS = GFConstant::getConstant(LHS, MRI)) {
if (auto CRHS = GFConstant::getConstant(RHS, MRI))
return constantFoldFCmp(*Cmp, *CLHS, *CRHS, MatchInfo);
// If we have a constant, make sure it is on the RHS.
std::swap(LHS, RHS);
Pred = CmpInst::getSwappedPredicate(Pred);
MatchInfo = [=](MachineIRBuilder &B) {
B.buildFCmp(Pred, Dst, LHS, RHS, Cmp->getFlags());
};
return true;
}
return false;
}
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