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//===- IndirectCallPromotionAnalysis.h - Indirect call analysis -*- 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
/// Interface to identify indirect call promotion candidates.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_INDIRECTCALLPROMOTIONANALYSIS_H
#define LLVM_ANALYSIS_INDIRECTCALLPROMOTIONANALYSIS_H
#include "llvm/ProfileData/InstrProf.h"
namespace llvm {
class Instruction;
// Class for identifying profitable indirect call promotion candidates when
// the indirect-call value profile metadata is available.
class ICallPromotionAnalysis {
private:
// Allocate space to read the profile annotation.
SmallVector<InstrProfValueData, 4> ValueDataArray;
// Count is the call count for the direct-call target.
// TotalCount is the total call count for the indirect-call callsite.
// RemainingCount is the TotalCount minus promoted-direct-call count.
// Return true we should promote this indirect-call target.
bool isPromotionProfitable(uint64_t Count, uint64_t TotalCount,
uint64_t RemainingCount);
// Returns the number of profitable candidates to promote for the
// current ValueDataArray and the given \p Inst.
uint32_t getProfitablePromotionCandidates(const Instruction *Inst,
uint64_t TotalCount);
// Noncopyable
ICallPromotionAnalysis(const ICallPromotionAnalysis &other) = delete;
ICallPromotionAnalysis &
operator=(const ICallPromotionAnalysis &other) = delete;
public:
ICallPromotionAnalysis() = default;
/// Returns reference to array of InstrProfValueData for the given
/// instruction \p I.
///
/// The \p NumVals, \p TotalCount and \p NumCandidates
/// are set to the number of values in the array, the total profile count
/// of the indirect call \p I, and the number of profitable candidates
/// in the given array (which is sorted in reverse order of profitability).
///
/// The returned array space is owned by this class, and overwritten on
/// subsequent calls.
MutableArrayRef<InstrProfValueData> getPromotionCandidatesForInstruction(
const Instruction *I, uint64_t &TotalCount, uint32_t &NumCandidates);
};
} // end namespace llvm
#endif
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