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///===- LazyMachineBlockFrequencyInfo.cpp - Lazy Machine Block Frequency --===//
///
/// The LLVM Compiler Infrastructure
///
/// This file is distributed under the University of Illinois Open Source
/// License. See LICENSE.TXT for details.
///
///===---------------------------------------------------------------------===//
/// \file
/// This is an alternative analysis pass to MachineBlockFrequencyInfo. The
/// difference is that with this pass the block frequencies are not computed
/// when the analysis pass is executed but rather when the BFI result is
/// explicitly requested by the analysis client.
///
///===---------------------------------------------------------------------===//
#include "llvm/CodeGen/LazyMachineBlockFrequencyInfo.h"
using namespace llvm;
#define DEBUG_TYPE "lazy-machine-block-freq"
INITIALIZE_PASS_BEGIN(LazyMachineBlockFrequencyInfoPass, DEBUG_TYPE,
"Lazy Machine Block Frequency Analysis", true, true)
INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
INITIALIZE_PASS_END(LazyMachineBlockFrequencyInfoPass, DEBUG_TYPE,
"Lazy Machine Block Frequency Analysis", true, true)
char LazyMachineBlockFrequencyInfoPass::ID = 0;
LazyMachineBlockFrequencyInfoPass::LazyMachineBlockFrequencyInfoPass()
: MachineFunctionPass(ID) {
initializeLazyMachineBlockFrequencyInfoPassPass(
*PassRegistry::getPassRegistry());
}
void LazyMachineBlockFrequencyInfoPass::print(raw_ostream &OS,
const Module *M) const {
LMBFI.getCalculated().print(OS, M);
}
void LazyMachineBlockFrequencyInfoPass::getAnalysisUsage(
AnalysisUsage &AU) const {
AU.addRequired<MachineBranchProbabilityInfo>();
AU.addRequired<MachineLoopInfo>();
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
}
void LazyMachineBlockFrequencyInfoPass::releaseMemory() {
LMBFI.releaseMemory();
}
bool LazyMachineBlockFrequencyInfoPass::runOnMachineFunction(
MachineFunction &MF) {
auto &BPIPass = getAnalysis<MachineBranchProbabilityInfo>();
auto &LI = getAnalysis<MachineLoopInfo>();
LMBFI.setAnalysis(&MF, &BPIPass, &LI);
return false;
}
void LazyMachineBlockFrequencyInfoPass::getLazyMachineBFIAnalysisUsage(
AnalysisUsage &AU) {
AU.addRequired<LazyMachineBlockFrequencyInfoPass>();
AU.addRequired<MachineBranchProbabilityInfo>();
AU.addRequired<MachineLoopInfo>();
}
void llvm::initializeLazyMachineBFIPassPass(PassRegistry &Registry) {
INITIALIZE_PASS_DEPENDENCY(LazyMachineBlockFrequencyInfoPass);
INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo);
INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo);
}
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