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596fdf75d9
Removing volatile may help optimization passes do more to the IR. However, this will increase scheduler freedom.
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
//===- ReduceOpcodes.cpp - Specialized Delta Pass -------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "ReduceMemoryOperations.h"
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#include "Delta.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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static void removeVolatileInFunction(Oracle &O, Function &F) {
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LLVMContext &Ctx = F.getContext();
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for (Instruction &I : instructions(F)) {
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if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
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if (LI->isVolatile() && !O.shouldKeep())
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LI->setVolatile(false);
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} else if (StoreInst *SI = dyn_cast<StoreInst>(&I)) {
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if (SI->isVolatile() && !O.shouldKeep())
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SI->setVolatile(false);
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} else if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(&I)) {
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if (RMW->isVolatile() && !O.shouldKeep())
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RMW->setVolatile(false);
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} else if (AtomicCmpXchgInst *CmpXChg = dyn_cast<AtomicCmpXchgInst>(&I)) {
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if (CmpXChg->isVolatile() && !O.shouldKeep())
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CmpXChg->setVolatile(false);
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} else if (MemIntrinsic *MemIntrin = dyn_cast<MemIntrinsic>(&I)) {
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if (MemIntrin->isVolatile() && !O.shouldKeep())
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MemIntrin->setVolatile(ConstantInt::getFalse(Ctx));
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}
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}
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}
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static void removeVolatileInModule(Oracle &O, Module &Mod) {
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for (Function &F : Mod)
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removeVolatileInFunction(O, F);
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}
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void llvm::reduceVolatileInstructionsDeltaPass(TestRunner &Test) {
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runDeltaPass(Test, removeVolatileInModule, "Reducing Volatile Instructions");
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}
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