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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 #include "llvm/Analysis/TargetLibraryInfo.h"
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20
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21 using namespace llvm;
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22
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23 #define DEBUG_TYPE "lazy-branch-prob"
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24
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25 INITIALIZE_PASS_BEGIN(LazyBranchProbabilityInfoPass, DEBUG_TYPE,
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26 "Lazy Branch Probability Analysis", true, true)
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27 INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
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28 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
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29 INITIALIZE_PASS_END(LazyBranchProbabilityInfoPass, DEBUG_TYPE,
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30 "Lazy Branch Probability Analysis", true, true)
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31
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32 char LazyBranchProbabilityInfoPass::ID = 0;
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33
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34 LazyBranchProbabilityInfoPass::LazyBranchProbabilityInfoPass()
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35 : FunctionPass(ID) {
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36 initializeLazyBranchProbabilityInfoPassPass(*PassRegistry::getPassRegistry());
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37 }
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38
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39 void LazyBranchProbabilityInfoPass::print(raw_ostream &OS,
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40 const Module *) const {
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41 LBPI->getCalculated().print(OS);
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42 }
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43
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44 void LazyBranchProbabilityInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
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45 AU.addRequired<LoopInfoWrapperPass>();
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46 AU.addRequired<TargetLibraryInfoWrapperPass>();
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47 AU.setPreservesAll();
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48 }
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49
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50 void LazyBranchProbabilityInfoPass::releaseMemory() { LBPI.reset(); }
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51
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52 bool LazyBranchProbabilityInfoPass::runOnFunction(Function &F) {
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53 LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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54 TargetLibraryInfo &TLI = getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
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55 LBPI = llvm::make_unique<LazyBranchProbabilityInfo>(&F, &LI, &TLI);
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56 return false;
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57 }
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58
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59 void LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(AnalysisUsage &AU) {
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60 AU.addRequired<LazyBranchProbabilityInfoPass>();
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61 AU.addRequired<LoopInfoWrapperPass>();
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62 AU.addRequired<TargetLibraryInfoWrapperPass>();
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63 }
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64
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65 void llvm::initializeLazyBPIPassPass(PassRegistry &Registry) {
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66 INITIALIZE_PASS_DEPENDENCY(LazyBranchProbabilityInfoPass);
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67 INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass);
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68 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass);
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69 }
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