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69 lines
2.5 KiB
69 lines
2.5 KiB
4 months ago
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//===- 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/BranchProbabilityInfo.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(BranchProbabilityInfoWrapperPass)
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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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AU.addRequired<BranchProbabilityInfoWrapperPass>();
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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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BranchProbabilityInfo &BPI =
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getAnalysis<BranchProbabilityInfoWrapperPass>().getBPI();
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LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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LBFI.setAnalysis(&F, &BPI, &LI);
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return false;
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}
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void LazyBlockFrequencyInfoPass::getLazyBFIAnalysisUsage(AnalysisUsage &AU) {
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AU.addRequired<BranchProbabilityInfoWrapperPass>();
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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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INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfoWrapperPass);
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INITIALIZE_PASS_DEPENDENCY(LazyBlockFrequencyInfoPass);
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass);
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}
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