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337f461009
And use it in MachineOptimizationRemarkEmitter. A test will follow on top of Justin's changes to enable MachineORE in AsmPrinter. The approach is similar to the IR-level pass. It's a bit simpler because BPI is immutable at the Machine level so we don't need to make that lazy. Because of this, a new function mapping is introduced (BPIPassTrait::getBPI). This function extracts BPI from the pass. In case of the lazy pass, this is when the calculation of the BFI occurs. For Machine-level, this is the identity function. Differential Revision: https://reviews.llvm.org/D29836 llvm-svn: 295072
75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
///===- LazyMachineBlockFrequencyInfo.cpp - Lazy Machine Block Frequency --===//
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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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/// \file
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/// This is an alternative analysis pass to MachineBlockFrequencyInfo. The
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/// difference is that with this pass the block frequencies are not computed
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/// when the analysis pass is executed but rather when the BFI result is
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/// explicitly requested by the analysis client.
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///
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///===---------------------------------------------------------------------===//
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#include "llvm/CodeGen/LazyMachineBlockFrequencyInfo.h"
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using namespace llvm;
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#define DEBUG_TYPE "lazy-machine-block-freq"
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INITIALIZE_PASS_BEGIN(LazyMachineBlockFrequencyInfoPass, DEBUG_TYPE,
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"Lazy Machine Block Frequency Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
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INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
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INITIALIZE_PASS_END(LazyMachineBlockFrequencyInfoPass, DEBUG_TYPE,
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"Lazy Machine Block Frequency Analysis", true, true)
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char LazyMachineBlockFrequencyInfoPass::ID = 0;
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LazyMachineBlockFrequencyInfoPass::LazyMachineBlockFrequencyInfoPass()
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: MachineFunctionPass(ID) {
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initializeLazyMachineBlockFrequencyInfoPassPass(
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*PassRegistry::getPassRegistry());
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}
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void LazyMachineBlockFrequencyInfoPass::print(raw_ostream &OS,
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const Module *M) const {
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LMBFI.getCalculated().print(OS, M);
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}
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void LazyMachineBlockFrequencyInfoPass::getAnalysisUsage(
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AnalysisUsage &AU) const {
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AU.addRequired<MachineBranchProbabilityInfo>();
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AU.addRequired<MachineLoopInfo>();
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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void LazyMachineBlockFrequencyInfoPass::releaseMemory() {
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LMBFI.releaseMemory();
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}
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bool LazyMachineBlockFrequencyInfoPass::runOnMachineFunction(
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MachineFunction &MF) {
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auto &BPIPass = getAnalysis<MachineBranchProbabilityInfo>();
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auto &LI = getAnalysis<MachineLoopInfo>();
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LMBFI.setAnalysis(&MF, &BPIPass, &LI);
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return false;
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}
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void LazyMachineBlockFrequencyInfoPass::getLazyMachineBFIAnalysisUsage(
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AnalysisUsage &AU) {
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AU.addRequired<LazyMachineBlockFrequencyInfoPass>();
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AU.addRequired<MachineBranchProbabilityInfo>();
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AU.addRequired<MachineLoopInfo>();
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}
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void llvm::initializeLazyMachineBFIPassPass(PassRegistry &Registry) {
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INITIALIZE_PASS_DEPENDENCY(LazyMachineBlockFrequencyInfoPass);
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INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo);
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INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo);
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}
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