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