64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
//=======-------- BlockFrequencyInfo.cpp - 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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// Loops should be simplified before this analysis.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/InitializePasses.h"
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#include "llvm/Analysis/BlockFrequencyImpl.h"
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#include "llvm/Analysis/BlockFrequencyInfo.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/BranchProbabilityInfo.h"
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using namespace llvm;
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INITIALIZE_PASS_BEGIN(BlockFrequencyInfo, "block-freq", "Block Frequency Analysis",
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true, true)
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INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfo)
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INITIALIZE_PASS_END(BlockFrequencyInfo, "block-freq", "Block Frequency Analysis",
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true, true)
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char BlockFrequencyInfo::ID = 0;
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BlockFrequencyInfo::BlockFrequencyInfo() : FunctionPass(ID) {
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initializeBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
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BFI = new BlockFrequencyImpl<BasicBlock, Function, BranchProbabilityInfo>();
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}
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BlockFrequencyInfo::~BlockFrequencyInfo() {
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delete BFI;
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}
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void BlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<BranchProbabilityInfo>();
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AU.setPreservesAll();
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}
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bool BlockFrequencyInfo::runOnFunction(Function &F) {
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BranchProbabilityInfo &BPI = getAnalysis<BranchProbabilityInfo>();
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BFI->doFunction(&F, &BPI);
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return false;
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}
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void BlockFrequencyInfo::print(raw_ostream &O, const Module *) const {
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if (BFI) BFI->print(O);
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}
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/// getblockFreq - Return block frequency. Return 0 if we don't have the
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/// information. Please note that initial frequency is equal to 1024. It means
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/// that we should not rely on the value itself, but only on the comparison to
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/// the other block frequencies. We do this to avoid using of floating points.
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///
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BlockFrequency BlockFrequencyInfo::getBlockFreq(const BasicBlock *BB) const {
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return BFI->getBlockFreq(BB);
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}
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