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//===- TailDuplication.cpp - Duplicate blocks into predecessors' tails ----===//
//
// 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 This pass duplicates basic blocks ending in unconditional branches
/// into the tails of their predecessors, using the TailDuplicator utility
/// class.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/TailDuplication.h"
#include "llvm/Analysis/ProfileSummaryInfo.h"
#include "llvm/CodeGen/LazyMachineBlockFrequencyInfo.h"
#include "llvm/CodeGen/MBFIWrapper.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachinePassManager.h"
#include "llvm/CodeGen/TailDuplicator.h"
#include "llvm/IR/Analysis.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/PassRegistry.h"
using namespace llvm;
#define DEBUG_TYPE "tailduplication"
namespace {
class TailDuplicateBaseLegacy : public MachineFunctionPass {
TailDuplicator Duplicator;
std::unique_ptr<MBFIWrapper> MBFIW;
bool PreRegAlloc;
public:
TailDuplicateBaseLegacy(char &PassID, bool PreRegAlloc)
: MachineFunctionPass(PassID), PreRegAlloc(PreRegAlloc) {}
bool runOnMachineFunction(MachineFunction &MF) override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<MachineBranchProbabilityInfoWrapperPass>();
AU.addRequired<LazyMachineBlockFrequencyInfoPass>();
AU.addRequired<ProfileSummaryInfoWrapperPass>();
MachineFunctionPass::getAnalysisUsage(AU);
}
};
class TailDuplicateLegacy : public TailDuplicateBaseLegacy {
public:
static char ID;
TailDuplicateLegacy() : TailDuplicateBaseLegacy(ID, false) {
initializeTailDuplicateLegacyPass(*PassRegistry::getPassRegistry());
}
};
class EarlyTailDuplicateLegacy : public TailDuplicateBaseLegacy {
public:
static char ID;
EarlyTailDuplicateLegacy() : TailDuplicateBaseLegacy(ID, true) {
initializeEarlyTailDuplicateLegacyPass(*PassRegistry::getPassRegistry());
}
MachineFunctionProperties getClearedProperties() const override {
return MachineFunctionProperties()
.set(MachineFunctionProperties::Property::NoPHIs);
}
};
} // end anonymous namespace
char TailDuplicateLegacy::ID;
char EarlyTailDuplicateLegacy::ID;
char &llvm::TailDuplicateLegacyID = TailDuplicateLegacy::ID;
char &llvm::EarlyTailDuplicateLegacyID = EarlyTailDuplicateLegacy::ID;
INITIALIZE_PASS(TailDuplicateLegacy, DEBUG_TYPE, "Tail Duplication", false,
false)
INITIALIZE_PASS(EarlyTailDuplicateLegacy, "early-tailduplication",
"Early Tail Duplication", false, false)
bool TailDuplicateBaseLegacy::runOnMachineFunction(MachineFunction &MF) {
if (skipFunction(MF.getFunction()))
return false;
auto MBPI = &getAnalysis<MachineBranchProbabilityInfoWrapperPass>().getMBPI();
auto *PSI = &getAnalysis<ProfileSummaryInfoWrapperPass>().getPSI();
auto *MBFI = (PSI && PSI->hasProfileSummary()) ?
&getAnalysis<LazyMachineBlockFrequencyInfoPass>().getBFI() :
nullptr;
if (MBFI)
MBFIW = std::make_unique<MBFIWrapper>(*MBFI);
Duplicator.initMF(MF, PreRegAlloc, MBPI, MBFI ? MBFIW.get() : nullptr, PSI,
/*LayoutMode=*/false);
bool MadeChange = false;
while (Duplicator.tailDuplicateBlocks())
MadeChange = true;
return MadeChange;
}
template <typename DerivedT, bool PreRegAlloc>
PreservedAnalyses TailDuplicatePassBase<DerivedT, PreRegAlloc>::run(
MachineFunction &MF, MachineFunctionAnalysisManager &MFAM) {
MFPropsModifier _(static_cast<DerivedT &>(*this), MF);
auto *MBPI = &MFAM.getResult<MachineBranchProbabilityAnalysis>(MF);
auto *PSI = MFAM.getResult<ModuleAnalysisManagerMachineFunctionProxy>(MF)
.getCachedResult<ProfileSummaryAnalysis>(
*MF.getFunction().getParent());
auto *MBFI = (PSI && PSI->hasProfileSummary()
? &MFAM.getResult<MachineBlockFrequencyAnalysis>(MF)
: nullptr);
if (MBFI)
MBFIW = std::make_unique<MBFIWrapper>(*MBFI);
TailDuplicator Duplicator;
Duplicator.initMF(MF, PreRegAlloc, MBPI, MBFI ? MBFIW.get() : nullptr, PSI,
/*LayoutMode=*/false);
bool MadeChange = false;
while (Duplicator.tailDuplicateBlocks())
MadeChange = true;
if (!MadeChange)
return PreservedAnalyses::all();
return getMachineFunctionPassPreservedAnalyses();
}
template class llvm::TailDuplicatePassBase<TailDuplicatePass, false>;
template class llvm::TailDuplicatePassBase<EarlyTailDuplicatePass, true>;
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