82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
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//===-------- BlockFrequency.h - Block Frequency Wrapper --------*- 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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//
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// This file implements Block Frequency class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_BLOCKFREQUENCY_H
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#define LLVM_SUPPORT_BLOCKFREQUENCY_H
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#include "llvm/Support/BranchProbability.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class raw_ostream;
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// This class represents Block Frequency as a 64-bit value.
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class BlockFrequency {
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uint64_t Frequency;
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public:
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BlockFrequency(uint64_t Freq = 0) : Frequency(Freq) { }
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/// Returns the maximum possible frequency, the saturation value.
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static uint64_t getMaxFrequency() { return -1ULL; }
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/// Returns the frequency as a fixpoint number scaled by the entry
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/// frequency.
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uint64_t getFrequency() const { return Frequency; }
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/// Multiplies with a branch probability. The computation will never
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/// overflow.
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BlockFrequency &operator*=(BranchProbability Prob);
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BlockFrequency operator*(BranchProbability Prob) const;
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/// Divide by a non-zero branch probability using saturating
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/// arithmetic.
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BlockFrequency &operator/=(BranchProbability Prob);
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BlockFrequency operator/(BranchProbability Prob) const;
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/// Adds another block frequency using saturating arithmetic.
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BlockFrequency &operator+=(BlockFrequency Freq);
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BlockFrequency operator+(BlockFrequency Freq) const;
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/// Subtracts another block frequency using saturating arithmetic.
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BlockFrequency &operator-=(BlockFrequency Freq);
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BlockFrequency operator-(BlockFrequency Freq) const;
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/// Shift block frequency to the right by count digits saturating to 1.
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BlockFrequency &operator>>=(const unsigned count);
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bool operator<(BlockFrequency RHS) const {
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return Frequency < RHS.Frequency;
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}
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bool operator<=(BlockFrequency RHS) const {
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return Frequency <= RHS.Frequency;
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}
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bool operator>(BlockFrequency RHS) const {
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return Frequency > RHS.Frequency;
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}
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bool operator>=(BlockFrequency RHS) const {
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return Frequency >= RHS.Frequency;
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}
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bool operator==(BlockFrequency RHS) const {
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return Frequency == RHS.Frequency;
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}
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};
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}
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#endif
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