forked from OSchip/llvm-project
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
//=======-------- BlockFrequency.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/BlockFrequency.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(BlockFrequency, "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(BlockFrequency, "block-freq", "Block Frequency Analysis",
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true, true)
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char BlockFrequency::ID = 0;
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BlockFrequency::BlockFrequency() : FunctionPass(ID) {
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initializeBlockFrequencyPass(*PassRegistry::getPassRegistry());
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BFI = new BlockFrequencyImpl<BasicBlock, Function, BranchProbabilityInfo>();
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}
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BlockFrequency::~BlockFrequency() {
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delete BFI;
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}
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void BlockFrequency::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 BlockFrequency::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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/// getblockFreq - Return block frequency. Never return 0, value must be
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/// positive. Please note that initial frequency is equal to 1024. It means that
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/// we should not rely on the value itself, but only on the comparison to the
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/// other block frequencies. We do this to avoid using of floating points.
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///
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uint32_t BlockFrequency::getBlockFreq(BasicBlock *BB) {
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return BFI->getBlockFreq(BB);
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}
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