1 //===- LazyBlockFrequencyInfo.cpp - Lazy Block Frequency Analysis ---------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This is an alternative analysis pass to BlockFrequencyInfoWrapperPass. The 11 // difference is that with this pass the block frequencies are not computed when 12 // the analysis pass is executed but rather when the BFI results is explicitly 13 // requested by the analysis client. 14 // 15 //===----------------------------------------------------------------------===// 16 17 #include "llvm/Analysis/LazyBlockFrequencyInfo.h" 18 #include "llvm/Analysis/BranchProbabilityInfo.h" 19 #include "llvm/Analysis/LoopInfo.h" 20 21 using namespace llvm; 22 23 #define DEBUG_TYPE "lazy-block-freq" 24 25 INITIALIZE_PASS_BEGIN(LazyBlockFrequencyInfoPass, DEBUG_TYPE, 26 "Lazy Block Frequency Analysis", true, true) 27 INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfoWrapperPass) 28 INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass) 29 INITIALIZE_PASS_END(LazyBlockFrequencyInfoPass, DEBUG_TYPE, 30 "Lazy Block Frequency Analysis", true, true) 31 32 char LazyBlockFrequencyInfoPass::ID = 0; 33 34 LazyBlockFrequencyInfoPass::LazyBlockFrequencyInfoPass() : FunctionPass(ID) { 35 initializeLazyBlockFrequencyInfoPassPass(*PassRegistry::getPassRegistry()); 36 } 37 38 void LazyBlockFrequencyInfoPass::print(raw_ostream &OS, const Module *) const { 39 LBFI.getCalculated().print(OS); 40 } 41 42 void LazyBlockFrequencyInfoPass::getAnalysisUsage(AnalysisUsage &AU) const { 43 AU.addRequired<BranchProbabilityInfoWrapperPass>(); 44 AU.addRequired<LoopInfoWrapperPass>(); 45 AU.setPreservesAll(); 46 } 47 48 void LazyBlockFrequencyInfoPass::releaseMemory() { LBFI.releaseMemory(); } 49 50 bool LazyBlockFrequencyInfoPass::runOnFunction(Function &F) { 51 BranchProbabilityInfo &BPI = 52 getAnalysis<BranchProbabilityInfoWrapperPass>().getBPI(); 53 LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo(); 54 LBFI.setAnalysis(&F, &BPI, &LI); 55 return false; 56 } 57 58 void LazyBlockFrequencyInfoPass::getLazyBFIAnalysisUsage(AnalysisUsage &AU) { 59 AU.addRequired<BranchProbabilityInfoWrapperPass>(); 60 AU.addRequired<LazyBlockFrequencyInfoPass>(); 61 AU.addRequired<LoopInfoWrapperPass>(); 62 } 63 64 void llvm::initializeLazyBFIPassPass(PassRegistry &Registry) { 65 INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfoWrapperPass); 66 INITIALIZE_PASS_DEPENDENCY(LazyBlockFrequencyInfoPass); 67 INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass); 68 } 69
