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49ae59819e
Summary: The method `getLoopPassPreservedAnalyses` should not mark MemorySSA as preserved, because it's being called in a lot of passes that do not preserve MemorySSA. Instead, mark the MemorySSA analysis as preserved by each pass that does preserve it. These changes only affect the new pass mananger. Reviewers: chandlerc Subscribers: mehdi_amini, jlebar, Prazek, george.burgess.iv, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D62536 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363091 91177308-0d34-0410-b5e6-96231b3b80d8
127 lines
4.7 KiB
C++
127 lines
4.7 KiB
C++
//===- LoopRotation.cpp - Loop Rotation 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 Loop Rotation Pass.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Scalar/LoopRotation.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Analysis/InstructionSimplify.h"
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#include "llvm/Analysis/LoopPass.h"
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#include "llvm/Analysis/MemorySSA.h"
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#include "llvm/Analysis/MemorySSAUpdater.h"
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Scalar/LoopPassManager.h"
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#include "llvm/Transforms/Utils/LoopRotationUtils.h"
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#include "llvm/Transforms/Utils/LoopUtils.h"
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using namespace llvm;
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#define DEBUG_TYPE "loop-rotate"
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static cl::opt<unsigned> DefaultRotationThreshold(
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"rotation-max-header-size", cl::init(16), cl::Hidden,
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cl::desc("The default maximum header size for automatic loop rotation"));
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LoopRotatePass::LoopRotatePass(bool EnableHeaderDuplication)
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: EnableHeaderDuplication(EnableHeaderDuplication) {}
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PreservedAnalyses LoopRotatePass::run(Loop &L, LoopAnalysisManager &AM,
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LoopStandardAnalysisResults &AR,
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LPMUpdater &) {
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int Threshold = EnableHeaderDuplication ? DefaultRotationThreshold : 0;
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const DataLayout &DL = L.getHeader()->getModule()->getDataLayout();
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const SimplifyQuery SQ = getBestSimplifyQuery(AR, DL);
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Optional<MemorySSAUpdater> MSSAU;
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if (AR.MSSA)
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MSSAU = MemorySSAUpdater(AR.MSSA);
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bool Changed = LoopRotation(&L, &AR.LI, &AR.TTI, &AR.AC, &AR.DT, &AR.SE,
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MSSAU.hasValue() ? MSSAU.getPointer() : nullptr,
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SQ, false, Threshold, false);
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if (!Changed)
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return PreservedAnalyses::all();
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if (AR.MSSA && VerifyMemorySSA)
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AR.MSSA->verifyMemorySSA();
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auto PA = getLoopPassPreservedAnalyses();
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if (EnableMSSALoopDependency)
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PA.preserve<MemorySSAAnalysis>();
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return PA;
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}
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namespace {
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class LoopRotateLegacyPass : public LoopPass {
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unsigned MaxHeaderSize;
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public:
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static char ID; // Pass ID, replacement for typeid
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LoopRotateLegacyPass(int SpecifiedMaxHeaderSize = -1) : LoopPass(ID) {
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initializeLoopRotateLegacyPassPass(*PassRegistry::getPassRegistry());
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if (SpecifiedMaxHeaderSize == -1)
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MaxHeaderSize = DefaultRotationThreshold;
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else
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MaxHeaderSize = unsigned(SpecifiedMaxHeaderSize);
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}
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// LCSSA form makes instruction renaming easier.
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<AssumptionCacheTracker>();
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AU.addRequired<TargetTransformInfoWrapperPass>();
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if (EnableMSSALoopDependency) {
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AU.addRequired<MemorySSAWrapperPass>();
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AU.addPreserved<MemorySSAWrapperPass>();
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}
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getLoopAnalysisUsage(AU);
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}
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bool runOnLoop(Loop *L, LPPassManager &LPM) override {
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if (skipLoop(L))
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return false;
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Function &F = *L->getHeader()->getParent();
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auto *LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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const auto *TTI = &getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
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auto *AC = &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
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auto *DTWP = getAnalysisIfAvailable<DominatorTreeWrapperPass>();
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auto *DT = DTWP ? &DTWP->getDomTree() : nullptr;
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auto *SEWP = getAnalysisIfAvailable<ScalarEvolutionWrapperPass>();
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auto *SE = SEWP ? &SEWP->getSE() : nullptr;
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const SimplifyQuery SQ = getBestSimplifyQuery(*this, F);
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Optional<MemorySSAUpdater> MSSAU;
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if (EnableMSSALoopDependency) {
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MemorySSA *MSSA = &getAnalysis<MemorySSAWrapperPass>().getMSSA();
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MSSAU = MemorySSAUpdater(MSSA);
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}
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return LoopRotation(L, LI, TTI, AC, DT, SE,
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MSSAU.hasValue() ? MSSAU.getPointer() : nullptr, SQ,
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false, MaxHeaderSize, false);
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}
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};
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}
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char LoopRotateLegacyPass::ID = 0;
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INITIALIZE_PASS_BEGIN(LoopRotateLegacyPass, "loop-rotate", "Rotate Loops",
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false, false)
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INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
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INITIALIZE_PASS_DEPENDENCY(LoopPass)
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INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
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INITIALIZE_PASS_DEPENDENCY(MemorySSAWrapperPass)
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INITIALIZE_PASS_END(LoopRotateLegacyPass, "loop-rotate", "Rotate Loops", false,
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false)
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Pass *llvm::createLoopRotatePass(int MaxHeaderSize) {
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return new LoopRotateLegacyPass(MaxHeaderSize);
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}
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