70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//===- ReduceUsingSimplifyCFG.h - 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements a function which calls the Generic Delta pass in order
|
|
// to call SimplifyCFG on individual basic blocks.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ReduceUsingSimplifyCFG.h"
|
|
#include "llvm/Analysis/TargetTransformInfo.h"
|
|
#include "llvm/IR/Constants.h"
|
|
#include "llvm/IR/Instructions.h"
|
|
#include "llvm/Transforms/Utils/Local.h"
|
|
|
|
using namespace llvm;
|
|
|
|
static void reduceUsingSimplifyCFG(Oracle &O, Module &Program) {
|
|
SmallVector<BasicBlock *, 16> ToSimplify;
|
|
for (auto &F : Program)
|
|
for (auto &BB : F)
|
|
if (!O.shouldKeep())
|
|
ToSimplify.push_back(&BB);
|
|
TargetTransformInfo TTI(Program.getDataLayout());
|
|
for (auto *BB : ToSimplify)
|
|
simplifyCFG(BB, TTI);
|
|
}
|
|
|
|
void llvm::reduceUsingSimplifyCFGDeltaPass(TestRunner &Test) {
|
|
runDeltaPass(Test, reduceUsingSimplifyCFG, "Reducing using SimplifyCFG");
|
|
}
|
|
static void reduceConditionals(Oracle &O, Module &M, bool Direction) {
|
|
SmallVector<BasicBlock *, 16> ToSimplify;
|
|
|
|
for (auto &F : M) {
|
|
for (auto &BB : F) {
|
|
auto *BR = dyn_cast<BranchInst>(BB.getTerminator());
|
|
if (!BR || !BR->isConditional() || O.shouldKeep())
|
|
continue;
|
|
|
|
if (Direction)
|
|
BR->setCondition(ConstantInt::getTrue(BR->getContext()));
|
|
else
|
|
BR->setCondition(ConstantInt::getFalse(BR->getContext()));
|
|
|
|
ToSimplify.push_back(&BB);
|
|
}
|
|
}
|
|
|
|
TargetTransformInfo TTI(M.getDataLayout());
|
|
for (auto *BB : ToSimplify)
|
|
simplifyCFG(BB, TTI);
|
|
}
|
|
|
|
void llvm::reduceConditionalsTrueDeltaPass(TestRunner &Test) {
|
|
runDeltaPass(
|
|
Test, [](Oracle &O, Module &M) { reduceConditionals(O, M, true); },
|
|
"Reducing conditional branches to true");
|
|
}
|
|
|
|
void llvm::reduceConditionalsFalseDeltaPass(TestRunner &Test) {
|
|
runDeltaPass(
|
|
Test, [](Oracle &O, Module &M) { reduceConditionals(O, M, false); },
|
|
"Reducing conditional branches to false");
|
|
}
|