97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
///===- MachineOptimizationRemarkEmitter.cpp - Opt Diagnostic -*- C++ -*---===//
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///
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/// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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/// See https://llvm.org/LICENSE.txt for license information.
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/// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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///
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///===---------------------------------------------------------------------===//
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/// \file
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/// Optimization diagnostic interfaces for machine passes. It's packaged as an
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/// analysis pass so that by using this service passes become dependent on MBFI
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/// as well. MBFI is used to compute the "hotness" of the diagnostic message.
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///
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///===---------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
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#include "llvm/CodeGen/LazyMachineBlockFrequencyInfo.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/InitializePasses.h"
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using namespace llvm;
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DiagnosticInfoMIROptimization::MachineArgument::MachineArgument(
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StringRef MKey, const MachineInstr &MI) {
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Key = std::string(MKey);
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raw_string_ostream OS(Val);
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MI.print(OS, /*IsStandalone=*/true, /*SkipOpers=*/false,
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/*SkipDebugLoc=*/true);
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}
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Optional<uint64_t>
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MachineOptimizationRemarkEmitter::computeHotness(const MachineBasicBlock &MBB) {
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if (!MBFI)
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return None;
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return MBFI->getBlockProfileCount(&MBB);
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}
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void MachineOptimizationRemarkEmitter::computeHotness(
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DiagnosticInfoMIROptimization &Remark) {
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const MachineBasicBlock *MBB = Remark.getBlock();
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if (MBB)
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Remark.setHotness(computeHotness(*MBB));
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}
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void MachineOptimizationRemarkEmitter::emit(
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DiagnosticInfoOptimizationBase &OptDiagCommon) {
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auto &OptDiag = cast<DiagnosticInfoMIROptimization>(OptDiagCommon);
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computeHotness(OptDiag);
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LLVMContext &Ctx = MF.getFunction().getContext();
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// Only emit it if its hotness meets the threshold.
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if (OptDiag.getHotness().value_or(0) < Ctx.getDiagnosticsHotnessThreshold())
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return;
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Ctx.diagnose(OptDiag);
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}
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MachineOptimizationRemarkEmitterPass::MachineOptimizationRemarkEmitterPass()
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: MachineFunctionPass(ID) {
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initializeMachineOptimizationRemarkEmitterPassPass(
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*PassRegistry::getPassRegistry());
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}
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bool MachineOptimizationRemarkEmitterPass::runOnMachineFunction(
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MachineFunction &MF) {
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MachineBlockFrequencyInfo *MBFI;
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if (MF.getFunction().getContext().getDiagnosticsHotnessRequested())
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MBFI = &getAnalysis<LazyMachineBlockFrequencyInfoPass>().getBFI();
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else
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MBFI = nullptr;
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ORE = std::make_unique<MachineOptimizationRemarkEmitter>(MF, MBFI);
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return false;
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}
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void MachineOptimizationRemarkEmitterPass::getAnalysisUsage(
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AnalysisUsage &AU) const {
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AU.addRequired<LazyMachineBlockFrequencyInfoPass>();
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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char MachineOptimizationRemarkEmitterPass::ID = 0;
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static const char ore_name[] = "Machine Optimization Remark Emitter";
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#define ORE_NAME "machine-opt-remark-emitter"
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INITIALIZE_PASS_BEGIN(MachineOptimizationRemarkEmitterPass, ORE_NAME, ore_name,
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true, true)
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INITIALIZE_PASS_DEPENDENCY(LazyMachineBlockFrequencyInfoPass)
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INITIALIZE_PASS_END(MachineOptimizationRemarkEmitterPass, ORE_NAME, ore_name,
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true, true)
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