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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
//===-------- 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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