62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
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//====----- MachineBlockFrequencyInfo.cpp - Machine 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/CodeGen/MachineBlockFrequencyInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
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using namespace llvm;
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INITIALIZE_PASS_BEGIN(MachineBlockFrequencyInfo, "machine-block-freq",
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"Machine Block Frequency Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
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INITIALIZE_PASS_END(MachineBlockFrequencyInfo, "machine-block-freq",
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"Machine Block Frequency Analysis", true, true)
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char MachineBlockFrequencyInfo::ID = 0;
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MachineBlockFrequencyInfo::MachineBlockFrequencyInfo() : MachineFunctionPass(ID) {
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initializeMachineBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
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MBFI = new BlockFrequencyImpl<MachineBasicBlock, MachineFunction,
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MachineBranchProbabilityInfo>();
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}
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MachineBlockFrequencyInfo::~MachineBlockFrequencyInfo() {
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delete MBFI;
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}
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void MachineBlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<MachineBranchProbabilityInfo>();
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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bool MachineBlockFrequencyInfo::runOnMachineFunction(MachineFunction &F) {
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MachineBranchProbabilityInfo &MBPI = getAnalysis<MachineBranchProbabilityInfo>();
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MBFI->doFunction(&F, &MBPI);
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return false;
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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 MachineBlockFrequencyInfo::
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getBlockFreq(const MachineBasicBlock *MBB) const {
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return MBFI->getBlockFreq(MBB);
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}
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