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//====----- MachineBlockFrequency.cpp - Machine Block Frequency Analysis ----====//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Loops should be simplified before this analysis.
//
//===----------------------------------------------------------------------===//
#include "llvm/InitializePasses.h"
#include "llvm/Analysis/BlockFrequencyImpl.h"
#include "llvm/CodeGen/MachineBlockFrequency.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
using namespace llvm;
INITIALIZE_PASS_BEGIN(MachineBlockFrequency, "machine-block-freq",
"Machine Block Frequency Analysis", true, true)
INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
INITIALIZE_PASS_END(MachineBlockFrequency, "machine-block-freq",
"Machine Block Frequency Analysis", true, true)
char MachineBlockFrequency::ID = 0;
MachineBlockFrequency::MachineBlockFrequency() : MachineFunctionPass(ID) {
initializeMachineBlockFrequencyPass(*PassRegistry::getPassRegistry());
MBFI = new BlockFrequencyImpl<MachineBasicBlock, MachineFunction,
MachineBranchProbabilityInfo>();
}
MachineBlockFrequency::~MachineBlockFrequency() {
delete MBFI;
}
void MachineBlockFrequency::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<MachineBranchProbabilityInfo>();
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
}
bool MachineBlockFrequency::runOnMachineFunction(MachineFunction &F) {
MachineBranchProbabilityInfo &MBPI = getAnalysis<MachineBranchProbabilityInfo>();
MBFI->doFunction(&F, &MBPI);
return false;
}
/// getblockFreq - Return block frequency. Never return 0, value must be
/// positive. Please note that initial frequency is equal to 1024. It means that
/// we should not rely on the value itself, but only on the comparison to the
/// other block frequencies. We do this to avoid using of floating points.
///
uint32_t MachineBlockFrequency::getBlockFreq(MachineBasicBlock *MBB) {
return MBFI->getBlockFreq(MBB);
}
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