llvm/llvm/lib/CodeGen/MachineBranchProbabilityInfo.cpp

//===- MachineBranchProbabilityInfo.cpp - Machine Branch Probability Info -===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This analysis uses probability info stored in Machine Basic Blocks.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"

usingnamespacellvm;

INITIALIZE_PASS_BEGIN(MachineBranchProbabilityInfoWrapperPass,
                      "machine-branch-prob",
                      "Machine Branch Probability Analysis", false, true)
INITIALIZE_PASS_END(MachineBranchProbabilityInfoWrapperPass,
                    "machine-branch-prob",
                    "Machine Branch Probability Analysis", false, true)

namespace llvm {
cl::opt<unsigned>
    StaticLikelyProb("static-likely-prob",
                     cl::desc("branch probability threshold in percentage"
                              "to be considered very likely"),
                     cl::init(80), cl::Hidden);

cl::opt<unsigned> ProfileLikelyProb(
    "profile-likely-prob",
    cl::desc("branch probability threshold in percentage to be considered"
             " very likely when profile is available"),
    cl::init(51), cl::Hidden);
} // namespace llvm

MachineBranchProbabilityAnalysis::Result
MachineBranchProbabilityAnalysis::run(MachineFunction &,
                                      MachineFunctionAnalysisManager &) { … }

PreservedAnalyses
MachineBranchProbabilityPrinterPass::run(MachineFunction &MF,
                                         MachineFunctionAnalysisManager &MFAM) { … }

char MachineBranchProbabilityInfoWrapperPass::ID = …;

MachineBranchProbabilityInfoWrapperPass::
    MachineBranchProbabilityInfoWrapperPass()
    : … { … }

void MachineBranchProbabilityInfoWrapperPass::anchor() { … }

AnalysisKey MachineBranchProbabilityAnalysis::Key;

bool MachineBranchProbabilityInfo::invalidate(
    MachineFunction &, const PreservedAnalyses &PA,
    MachineFunctionAnalysisManager::Invalidator &) { … }

BranchProbability MachineBranchProbabilityInfo::getEdgeProbability(
    const MachineBasicBlock *Src,
    MachineBasicBlock::const_succ_iterator Dst) const { … }

BranchProbability MachineBranchProbabilityInfo::getEdgeProbability(
    const MachineBasicBlock *Src, const MachineBasicBlock *Dst) const { … }

bool MachineBranchProbabilityInfo::isEdgeHot(
    const MachineBasicBlock *Src, const MachineBasicBlock *Dst) const { … }

raw_ostream &MachineBranchProbabilityInfo::printEdgeProbability(
    raw_ostream &OS, const MachineBasicBlock *Src,
    const MachineBasicBlock *Dst) const { … }