| 1 | //===- ReduceUsingSimplifyCFG.h - Specialized Delta Pass ------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements a function which calls the Generic Delta pass in order |
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| 10 | // to call SimplifyCFG on individual basic blocks. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #include "ReduceUsingSimplifyCFG.h" |
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| 15 | #include "llvm/Analysis/TargetTransformInfo.h" |
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| 16 | #include "llvm/IR/Constants.h" |
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| 17 | #include "llvm/IR/Instructions.h" |
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| 18 | #include "llvm/Transforms/Utils/Local.h" |
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| 19 | |
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| 20 | using namespace llvm; |
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| 21 | |
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| 22 | static void reduceUsingSimplifyCFG(Oracle &O, ReducerWorkItem &WorkItem) { |
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| 23 | Module &Program = WorkItem.getModule(); |
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| 24 | SmallVector<BasicBlock *, 16> ToSimplify; |
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| 25 | for (auto &F : Program) |
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| 26 | for (auto &BB : F) |
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| 27 | if (!O.shouldKeep()) |
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| 28 | ToSimplify.push_back(Elt: &BB); |
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| 29 | TargetTransformInfo TTI(Program.getDataLayout()); |
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| 30 | for (auto *BB : ToSimplify) |
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| 31 | simplifyCFG(BB, TTI); |
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| 32 | } |
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| 33 | |
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| 34 | void llvm::reduceUsingSimplifyCFGDeltaPass(TestRunner &Test) { |
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| 35 | runDeltaPass(Test, ExtractChunksFromModule: reduceUsingSimplifyCFG, Message: "Reducing using SimplifyCFG" ); |
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| 36 | } |
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| 37 | static void reduceConditionals(Oracle &O, ReducerWorkItem &WorkItem, |
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| 38 | bool Direction) { |
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| 39 | Module &M = WorkItem.getModule(); |
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| 40 | SmallVector<BasicBlock *, 16> ToSimplify; |
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| 41 | |
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| 42 | for (auto &F : M) { |
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| 43 | for (auto &BB : F) { |
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| 44 | auto *BR = dyn_cast<BranchInst>(Val: BB.getTerminator()); |
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| 45 | if (!BR || !BR->isConditional() || O.shouldKeep()) |
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| 46 | continue; |
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| 47 | |
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| 48 | if (Direction) |
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| 49 | BR->setCondition(ConstantInt::getTrue(Context&: BR->getContext())); |
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| 50 | else |
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| 51 | BR->setCondition(ConstantInt::getFalse(Context&: BR->getContext())); |
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| 52 | |
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| 53 | ToSimplify.push_back(Elt: &BB); |
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| 54 | } |
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| 55 | } |
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| 56 | |
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| 57 | TargetTransformInfo TTI(M.getDataLayout()); |
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| 58 | for (auto *BB : ToSimplify) |
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| 59 | simplifyCFG(BB, TTI); |
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| 60 | } |
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| 61 | |
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| 62 | void llvm::reduceConditionalsTrueDeltaPass(TestRunner &Test) { |
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| 63 | runDeltaPass( |
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| 64 | Test, |
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| 65 | ExtractChunksFromModule: [](Oracle &O, ReducerWorkItem &WorkItem) { |
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| 66 | reduceConditionals(O, WorkItem, Direction: true); |
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| 67 | }, |
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| 68 | Message: "Reducing conditional branches to true" ); |
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| 69 | } |
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| 70 | |
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| 71 | void llvm::reduceConditionalsFalseDeltaPass(TestRunner &Test) { |
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| 72 | runDeltaPass( |
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| 73 | Test, |
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| 74 | ExtractChunksFromModule: [](Oracle &O, ReducerWorkItem &WorkItem) { |
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| 75 | reduceConditionals(O, WorkItem, Direction: false); |
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| 76 | }, |
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| 77 | Message: "Reducing conditional branches to false" ); |
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| 78 | } |
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| 79 | |
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