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1 //===- LazyBranchProbabilityInfo.cpp - Lazy Branch Probability Analysis ---===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This is an alternative analysis pass to BranchProbabilityInfoWrapperPass.
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11 // The difference is that with this pass the branch probabilities are not
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12 // computed when the analysis pass is executed but rather when the BPI results
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13 // is explicitly requested by the analysis client.
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14 //
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15 //===----------------------------------------------------------------------===//
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16
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17 #include "llvm/Analysis/LazyBranchProbabilityInfo.h"
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18 #include "llvm/Analysis/LoopInfo.h"
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19
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20 using namespace llvm;
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21
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22 #define DEBUG_TYPE "lazy-branch-prob"
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23
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24 INITIALIZE_PASS_BEGIN(LazyBranchProbabilityInfoPass, DEBUG_TYPE,
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25 "Lazy Branch Probability Analysis", true, true)
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26 INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
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27 INITIALIZE_PASS_END(LazyBranchProbabilityInfoPass, DEBUG_TYPE,
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28 "Lazy Branch Probability Analysis", true, true)
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29
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30 char LazyBranchProbabilityInfoPass::ID = 0;
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31
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32 LazyBranchProbabilityInfoPass::LazyBranchProbabilityInfoPass()
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33 : FunctionPass(ID) {
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34 initializeLazyBranchProbabilityInfoPassPass(*PassRegistry::getPassRegistry());
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35 }
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36
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37 void LazyBranchProbabilityInfoPass::print(raw_ostream &OS,
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38 const Module *) const {
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39 LBPI->getCalculated().print(OS);
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40 }
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41
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42 void LazyBranchProbabilityInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
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43 AU.addRequired<LoopInfoWrapperPass>();
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44 AU.setPreservesAll();
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45 }
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46
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47 void LazyBranchProbabilityInfoPass::releaseMemory() { LBPI.reset(); }
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48
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49 bool LazyBranchProbabilityInfoPass::runOnFunction(Function &F) {
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50 LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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51 LBPI = llvm::make_unique<LazyBranchProbabilityInfo>(&F, &LI);
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52 return false;
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53 }
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54
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55 void LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(AnalysisUsage &AU) {
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56 AU.addRequired<LazyBranchProbabilityInfoPass>();
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57 AU.addRequired<LoopInfoWrapperPass>();
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58 }
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59
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60 void llvm::initializeLazyBPIPassPass(PassRegistry &Registry) {
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61 INITIALIZE_PASS_DEPENDENCY(LazyBranchProbabilityInfoPass);
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62 INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass);
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63 }
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