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//===- 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 "Utils.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;
void llvm::reduceUsingSimplifyCFGDeltaPass(Oracle &O,
ReducerWorkItem &WorkItem) {
Module &Program = WorkItem.getModule();
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);
}
static void reduceConditionals(Oracle &O, ReducerWorkItem &WorkItem,
bool Direction) {
Module &M = WorkItem.getModule();
LLVMContext &Ctx = M.getContext();
ConstantInt *ConstValToSet =
Direction ? ConstantInt::getTrue(Ctx) : ConstantInt::getFalse(Ctx);
for (Function &F : M) {
if (F.isDeclaration())
continue;
SmallVector<BasicBlock *, 16> ToSimplify;
for (auto &BB : F) {
auto *BR = dyn_cast<BranchInst>(BB.getTerminator());
if (!BR || !BR->isConditional() || BR->getCondition() == ConstValToSet ||
O.shouldKeep())
continue;
BR->setCondition(ConstValToSet);
ToSimplify.push_back(&BB);
}
if (!ToSimplify.empty()) {
// TODO: Should probably leave MergeBlockIntoPredecessor for a separate
// reduction
simpleSimplifyCFG(F, ToSimplify);
}
}
}
void llvm::reduceConditionalsTrueDeltaPass(Oracle &O,
ReducerWorkItem &WorkItem) {
reduceConditionals(O, WorkItem, true);
}
void llvm::reduceConditionalsFalseDeltaPass(Oracle &O,
ReducerWorkItem &WorkItem) {
reduceConditionals(O, WorkItem, false);
}
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