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134 lines
4.2 KiB
C++
134 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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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;
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BPI.calculate(*F, LI);
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// Finally compute BFI.
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OwnedBFI = llvm::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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// 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 = llvm::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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