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//===- llvm/Transforms/Utils/SizeOpts.h - size optimization -----*- 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
//
//===----------------------------------------------------------------------===//
//
// This file contains some shared code size optimization related code.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_UTILS_SIZEOPTS_H
#define LLVM_TRANSFORMS_UTILS_SIZEOPTS_H
#include "llvm/Analysis/ProfileSummaryInfo.h"
#include "llvm/Support/CommandLine.h"
namespace llvm {
extern cl::opt<bool> EnablePGSO;
extern cl::opt<bool> PGSOLargeWorkingSetSizeOnly;
extern cl::opt<bool> PGSOColdCodeOnly;
extern cl::opt<bool> PGSOColdCodeOnlyForInstrPGO;
extern cl::opt<bool> PGSOColdCodeOnlyForSamplePGO;
extern cl::opt<bool> PGSOColdCodeOnlyForPartialSamplePGO;
extern cl::opt<bool> ForcePGSO;
extern cl::opt<int> PgsoCutoffInstrProf;
extern cl::opt<int> PgsoCutoffSampleProf;
class BasicBlock;
class BlockFrequencyInfo;
class Function;
enum class PGSOQueryType {
IRPass, // A query call from an IR-level transform pass.
Test, // A query call from a unit test.
Other, // Others.
};
static inline bool isPGSOColdCodeOnly(ProfileSummaryInfo *PSI) {
return PGSOColdCodeOnly ||
(PSI->hasInstrumentationProfile() && PGSOColdCodeOnlyForInstrPGO) ||
(PSI->hasSampleProfile() &&
((!PSI->hasPartialSampleProfile() && PGSOColdCodeOnlyForSamplePGO) ||
(PSI->hasPartialSampleProfile() &&
PGSOColdCodeOnlyForPartialSamplePGO))) ||
(PGSOLargeWorkingSetSizeOnly && !PSI->hasLargeWorkingSetSize());
}
template <typename FuncT, typename BFIT>
bool shouldFuncOptimizeForSizeImpl(const FuncT *F, ProfileSummaryInfo *PSI,
BFIT *BFI, PGSOQueryType QueryType) {
assert(F);
if (!PSI || !BFI || !PSI->hasProfileSummary())
return false;
if (ForcePGSO)
return true;
if (!EnablePGSO)
return false;
if (isPGSOColdCodeOnly(PSI))
return PSI->isFunctionColdInCallGraph(F, *BFI);
if (PSI->hasSampleProfile())
// The "isCold" check seems to work better for Sample PGO as it could have
// many profile-unannotated functions.
return PSI->isFunctionColdInCallGraphNthPercentile(PgsoCutoffSampleProf, F,
*BFI);
return !PSI->isFunctionHotInCallGraphNthPercentile(PgsoCutoffInstrProf, F,
*BFI);
}
template <typename BlockTOrBlockFreq, typename BFIT>
bool shouldOptimizeForSizeImpl(BlockTOrBlockFreq BBOrBlockFreq,
ProfileSummaryInfo *PSI, BFIT *BFI,
PGSOQueryType QueryType) {
if (!PSI || !BFI || !PSI->hasProfileSummary())
return false;
if (ForcePGSO)
return true;
if (!EnablePGSO)
return false;
if (isPGSOColdCodeOnly(PSI))
return PSI->isColdBlock(BBOrBlockFreq, BFI);
if (PSI->hasSampleProfile())
// The "isCold" check seems to work better for Sample PGO as it could have
// many profile-unannotated functions.
return PSI->isColdBlockNthPercentile(PgsoCutoffSampleProf, BBOrBlockFreq,
BFI);
return !PSI->isHotBlockNthPercentile(PgsoCutoffInstrProf, BBOrBlockFreq, BFI);
}
/// Returns true if function \p F is suggested to be size-optimized based on the
/// profile.
bool shouldOptimizeForSize(const Function *F, ProfileSummaryInfo *PSI,
BlockFrequencyInfo *BFI,
PGSOQueryType QueryType = PGSOQueryType::Other);
/// Returns true if basic block \p BB is suggested to be size-optimized based on
/// the profile.
bool shouldOptimizeForSize(const BasicBlock *BB, ProfileSummaryInfo *PSI,
BlockFrequencyInfo *BFI,
PGSOQueryType QueryType = PGSOQueryType::Other);
} // end namespace llvm
#endif // LLVM_TRANSFORMS_UTILS_SIZEOPTS_H
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