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