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//===- ReduceOpcodes.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
//
//===----------------------------------------------------------------------===//
#include "ReduceMemoryOperations.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
using namespace llvm;
static void removeVolatileInFunction(Oracle &O, Function &F) {
LLVMContext &Ctx = F.getContext();
for (Instruction &I : instructions(F)) {
if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
if (LI->isVolatile() && !O.shouldKeep())
LI->setVolatile(false);
} else if (StoreInst *SI = dyn_cast<StoreInst>(&I)) {
if (SI->isVolatile() && !O.shouldKeep())
SI->setVolatile(false);
} else if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(&I)) {
if (RMW->isVolatile() && !O.shouldKeep())
RMW->setVolatile(false);
} else if (AtomicCmpXchgInst *CmpXChg = dyn_cast<AtomicCmpXchgInst>(&I)) {
if (CmpXChg->isVolatile() && !O.shouldKeep())
CmpXChg->setVolatile(false);
} else if (MemIntrinsic *MemIntrin = dyn_cast<MemIntrinsic>(&I)) {
if (MemIntrin->isVolatile() && !O.shouldKeep())
MemIntrin->setVolatile(ConstantInt::getFalse(Ctx));
}
}
}
void llvm::reduceVolatileInstructionsDeltaPass(Oracle &O,
ReducerWorkItem &WorkItem) {
for (Function &F : WorkItem.getModule())
removeVolatileInFunction(O, F);
}
static void reduceAtomicSyncScopesInFunction(Oracle &O, Function &F) {
for (Instruction &I : instructions(F)) {
if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
if (LI->getSyncScopeID() != SyncScope::System && !O.shouldKeep())
LI->setSyncScopeID(SyncScope::System);
} else if (StoreInst *SI = dyn_cast<StoreInst>(&I)) {
if (SI->getSyncScopeID() != SyncScope::System && !O.shouldKeep())
SI->setSyncScopeID(SyncScope::System);
} else if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(&I)) {
if (RMW->getSyncScopeID() != SyncScope::System && !O.shouldKeep())
RMW->setSyncScopeID(SyncScope::System);
} else if (AtomicCmpXchgInst *CmpXChg = dyn_cast<AtomicCmpXchgInst>(&I)) {
if (CmpXChg->getSyncScopeID() != SyncScope::System && !O.shouldKeep())
CmpXChg->setSyncScopeID(SyncScope::System);
} else if (FenceInst *Fence = dyn_cast<FenceInst>(&I)) {
if (Fence->getSyncScopeID() != SyncScope::System && !O.shouldKeep())
Fence->setSyncScopeID(SyncScope::System);
}
}
}
void llvm::reduceAtomicSyncScopesDeltaPass(Oracle &O,
ReducerWorkItem &WorkItem) {
for (Function &F : WorkItem.getModule())
reduceAtomicSyncScopesInFunction(O, F);
}
// TODO: Might be helpful to incrementally relax orders
static void reduceAtomicOrderingInFunction(Oracle &O, Function &F) {
for (Instruction &I : instructions(F)) {
if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
if (LI->getOrdering() != AtomicOrdering::NotAtomic && !O.shouldKeep())
LI->setAtomic(AtomicOrdering::NotAtomic);
} else if (StoreInst *SI = dyn_cast<StoreInst>(&I)) {
if (SI->getOrdering() != AtomicOrdering::NotAtomic && !O.shouldKeep())
SI->setAtomic(AtomicOrdering::NotAtomic);
} else if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(&I)) {
if (RMW->getOrdering() != AtomicOrdering::Monotonic && !O.shouldKeep())
RMW->setOrdering(AtomicOrdering::Monotonic);
} else if (AtomicCmpXchgInst *CmpXChg = dyn_cast<AtomicCmpXchgInst>(&I)) {
if (CmpXChg->getSuccessOrdering() != AtomicOrdering::Monotonic &&
!O.shouldKeep())
CmpXChg->setSuccessOrdering(AtomicOrdering::Monotonic);
if (CmpXChg->getFailureOrdering() != AtomicOrdering::Monotonic &&
!O.shouldKeep())
CmpXChg->setFailureOrdering(AtomicOrdering::Monotonic);
}
}
}
void llvm::reduceAtomicOrderingDeltaPass(Oracle &O, ReducerWorkItem &WorkItem) {
for (Function &F : WorkItem.getModule())
reduceAtomicOrderingInFunction(O, F);
}
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