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//===- ReduceInstructionFlags.cpp - Specialized Delta Pass ----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Try to remove optimization flags on instructions
//
//===----------------------------------------------------------------------===//
#include "ReduceInstructionFlags.h"
#include "Delta.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Operator.h"
using namespace llvm;
static void reduceFlagsInModule(Oracle &O, ReducerWorkItem &WorkItem) {
for (Function &F : WorkItem.getModule()) {
for (Instruction &I : instructions(F)) {
if (auto *OBO = dyn_cast<OverflowingBinaryOperator>(&I)) {
if (OBO->hasNoSignedWrap() && !O.shouldKeep())
I.setHasNoSignedWrap(false);
if (OBO->hasNoUnsignedWrap() && !O.shouldKeep())
I.setHasNoUnsignedWrap(false);
} else if (auto *Trunc = dyn_cast<TruncInst>(&I)) {
if (Trunc->hasNoSignedWrap() && !O.shouldKeep())
Trunc->setHasNoSignedWrap(false);
if (Trunc->hasNoUnsignedWrap() && !O.shouldKeep())
Trunc->setHasNoUnsignedWrap(false);
} else if (auto *PE = dyn_cast<PossiblyExactOperator>(&I)) {
if (PE->isExact() && !O.shouldKeep())
I.setIsExact(false);
} else if (auto *NNI = dyn_cast<PossiblyNonNegInst>(&I)) {
if (NNI->hasNonNeg() && !O.shouldKeep())
NNI->setNonNeg(false);
} else if (auto *PDI = dyn_cast<PossiblyDisjointInst>(&I)) {
if (PDI->isDisjoint() && !O.shouldKeep())
PDI->setIsDisjoint(false);
} else if (auto *GEP = dyn_cast<GetElementPtrInst>(&I)) {
GEPNoWrapFlags NW = GEP->getNoWrapFlags();
if (NW.isInBounds() && !O.shouldKeep())
NW = NW.withoutInBounds();
if (NW.hasNoUnsignedSignedWrap() && !O.shouldKeep())
NW = NW.withoutNoUnsignedSignedWrap();
if (NW.hasNoUnsignedWrap() && !O.shouldKeep())
NW = NW.withoutNoUnsignedWrap();
GEP->setNoWrapFlags(NW);
} else if (auto *FPOp = dyn_cast<FPMathOperator>(&I)) {
FastMathFlags Flags = FPOp->getFastMathFlags();
if (Flags.allowReassoc() && !O.shouldKeep())
Flags.setAllowReassoc(false);
if (Flags.noNaNs() && !O.shouldKeep())
Flags.setNoNaNs(false);
if (Flags.noInfs() && !O.shouldKeep())
Flags.setNoInfs(false);
if (Flags.noSignedZeros() && !O.shouldKeep())
Flags.setNoSignedZeros(false);
if (Flags.allowReciprocal() && !O.shouldKeep())
Flags.setAllowReciprocal(false);
if (Flags.allowContract() && !O.shouldKeep())
Flags.setAllowContract(false);
if (Flags.approxFunc() && !O.shouldKeep())
Flags.setApproxFunc(false);
I.copyFastMathFlags(Flags);
}
}
}
}
void llvm::reduceInstructionFlagsDeltaPass(TestRunner &Test) {
runDeltaPass(Test, reduceFlagsInModule, "Reducing Instruction Flags");
}
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