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9449a00cc1
Summary: The motivation is the same as in D22141: In order to add the hotness attribute to optimization remarks we need BFI to be available in all passes that emit optimization remarks. BFI depends on BPI so unless we make this lazy as well we would still compute BPI unconditionally. The solution is to use the new LazyBPI pass in LazyBFI and only compute BPI when computation of BFI is requested by the client. I extended the laziness test using a LoopDistribute test to also cover BPI. Reviewers: hfinkel, davidxl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D22835 llvm-svn: 277083
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
//===- LazyBlockFrequencyInfo.cpp - Lazy Block Frequency Analysis ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is an alternative analysis pass to BlockFrequencyInfoWrapperPass. The
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// difference is that with this pass the block frequencies are not computed when
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// the analysis pass is executed but rather when the BFI results is explicitly
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// requested by the analysis client.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LazyBlockFrequencyInfo.h"
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#include "llvm/Analysis/LazyBranchProbabilityInfo.h"
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#include "llvm/Analysis/LoopInfo.h"
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using namespace llvm;
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#define DEBUG_TYPE "lazy-block-freq"
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INITIALIZE_PASS_BEGIN(LazyBlockFrequencyInfoPass, DEBUG_TYPE,
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"Lazy Block Frequency Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(LazyBPIPass)
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
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INITIALIZE_PASS_END(LazyBlockFrequencyInfoPass, DEBUG_TYPE,
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"Lazy Block Frequency Analysis", true, true)
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char LazyBlockFrequencyInfoPass::ID = 0;
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LazyBlockFrequencyInfoPass::LazyBlockFrequencyInfoPass() : FunctionPass(ID) {
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initializeLazyBlockFrequencyInfoPassPass(*PassRegistry::getPassRegistry());
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}
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void LazyBlockFrequencyInfoPass::print(raw_ostream &OS, const Module *) const {
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LBFI.getCalculated().print(OS);
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}
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void LazyBlockFrequencyInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
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LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(AU);
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AU.addRequired<LoopInfoWrapperPass>();
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AU.setPreservesAll();
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}
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void LazyBlockFrequencyInfoPass::releaseMemory() { LBFI.releaseMemory(); }
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bool LazyBlockFrequencyInfoPass::runOnFunction(Function &F) {
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auto &BPIPass = getAnalysis<LazyBranchProbabilityInfoPass>();
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LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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LBFI.setAnalysis(&F, &BPIPass, &LI);
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return false;
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}
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void LazyBlockFrequencyInfoPass::getLazyBFIAnalysisUsage(AnalysisUsage &AU) {
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LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(AU);
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AU.addRequired<LazyBlockFrequencyInfoPass>();
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AU.addRequired<LoopInfoWrapperPass>();
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}
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void llvm::initializeLazyBFIPassPass(PassRegistry &Registry) {
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initializeLazyBPIPassPass(Registry);
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INITIALIZE_PASS_DEPENDENCY(LazyBlockFrequencyInfoPass);
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass);
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}
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