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850ecb1d9c
Summary: Currenlty BPI unconditionally creates post dominator tree each time. While this is not incorrect we can save compile time by reusing existing post dominator tree (when it's valid) provided by analysis manager. Reviewers: skatkov, taewookoh, yrouban Reviewed By: skatkov Subscribers: hiraditya, steven_wu, dexonsmith, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D78987
138 lines
4.2 KiB
C++
138 lines
4.2 KiB
C++
//===- OptimizationRemarkEmitter.cpp - Optimization Diagnostic --*- C++ -*-===//
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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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// Optimization diagnostic interfaces. It's packaged as an analysis pass so
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// that by using this service passes become dependent on BFI as well. BFI is
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// used to compute the "hotness" of the diagnostic message.
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/OptimizationRemarkEmitter.h"
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#include "llvm/Analysis/BranchProbabilityInfo.h"
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#include "llvm/Analysis/LazyBlockFrequencyInfo.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/InitializePasses.h"
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using namespace llvm;
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OptimizationRemarkEmitter::OptimizationRemarkEmitter(const Function *F)
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: F(F), BFI(nullptr) {
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if (!F->getContext().getDiagnosticsHotnessRequested())
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return;
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// First create a dominator tree.
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DominatorTree DT;
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DT.recalculate(*const_cast<Function *>(F));
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// Generate LoopInfo from it.
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LoopInfo LI;
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LI.analyze(DT);
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// Then compute BranchProbabilityInfo.
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BranchProbabilityInfo BPI(*F, LI);
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// Finally compute BFI.
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OwnedBFI = std::make_unique<BlockFrequencyInfo>(*F, BPI, LI);
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BFI = OwnedBFI.get();
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}
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bool OptimizationRemarkEmitter::invalidate(
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Function &F, const PreservedAnalyses &PA,
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FunctionAnalysisManager::Invalidator &Inv) {
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if (OwnedBFI.get()) {
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OwnedBFI.reset();
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BFI = nullptr;
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}
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// This analysis has no state and so can be trivially preserved but it needs
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// a fresh view of BFI if it was constructed with one.
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if (BFI && Inv.invalidate<BlockFrequencyAnalysis>(F, PA))
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return true;
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// Otherwise this analysis result remains valid.
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return false;
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}
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Optional<uint64_t> OptimizationRemarkEmitter::computeHotness(const Value *V) {
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if (!BFI)
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return None;
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return BFI->getBlockProfileCount(cast<BasicBlock>(V));
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}
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void OptimizationRemarkEmitter::computeHotness(
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DiagnosticInfoIROptimization &OptDiag) {
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const Value *V = OptDiag.getCodeRegion();
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if (V)
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OptDiag.setHotness(computeHotness(V));
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}
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void OptimizationRemarkEmitter::emit(
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DiagnosticInfoOptimizationBase &OptDiagBase) {
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auto &OptDiag = cast<DiagnosticInfoIROptimization>(OptDiagBase);
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computeHotness(OptDiag);
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// Only emit it if its hotness meets the threshold.
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if (OptDiag.getHotness().getValueOr(0) <
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F->getContext().getDiagnosticsHotnessThreshold()) {
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return;
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}
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F->getContext().diagnose(OptDiag);
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}
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OptimizationRemarkEmitterWrapperPass::OptimizationRemarkEmitterWrapperPass()
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: FunctionPass(ID) {
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initializeOptimizationRemarkEmitterWrapperPassPass(
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*PassRegistry::getPassRegistry());
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}
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bool OptimizationRemarkEmitterWrapperPass::runOnFunction(Function &Fn) {
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BlockFrequencyInfo *BFI;
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if (Fn.getContext().getDiagnosticsHotnessRequested())
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BFI = &getAnalysis<LazyBlockFrequencyInfoPass>().getBFI();
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else
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BFI = nullptr;
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ORE = std::make_unique<OptimizationRemarkEmitter>(&Fn, BFI);
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return false;
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}
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void OptimizationRemarkEmitterWrapperPass::getAnalysisUsage(
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AnalysisUsage &AU) const {
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LazyBlockFrequencyInfoPass::getLazyBFIAnalysisUsage(AU);
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AU.setPreservesAll();
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}
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AnalysisKey OptimizationRemarkEmitterAnalysis::Key;
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OptimizationRemarkEmitter
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OptimizationRemarkEmitterAnalysis::run(Function &F,
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FunctionAnalysisManager &AM) {
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BlockFrequencyInfo *BFI;
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if (F.getContext().getDiagnosticsHotnessRequested())
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BFI = &AM.getResult<BlockFrequencyAnalysis>(F);
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else
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BFI = nullptr;
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return OptimizationRemarkEmitter(&F, BFI);
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}
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char OptimizationRemarkEmitterWrapperPass::ID = 0;
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static const char ore_name[] = "Optimization Remark Emitter";
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#define ORE_NAME "opt-remark-emitter"
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INITIALIZE_PASS_BEGIN(OptimizationRemarkEmitterWrapperPass, ORE_NAME, ore_name,
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false, true)
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INITIALIZE_PASS_DEPENDENCY(LazyBFIPass)
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INITIALIZE_PASS_END(OptimizationRemarkEmitterWrapperPass, ORE_NAME, ore_name,
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false, true)
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