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