84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
//====--------------- lib/Support/BlockFrequency.cpp -----------*- C++ -*-====//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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#include "llvm/Support/BlockFrequency.h"
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#include <cassert>
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using namespace llvm;
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BlockFrequency &BlockFrequency::operator*=(BranchProbability Prob) {
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Frequency = Prob.scale(Frequency);
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return *this;
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}
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BlockFrequency BlockFrequency::operator*(BranchProbability Prob) const {
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BlockFrequency Freq(Frequency);
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Freq *= Prob;
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return Freq;
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}
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BlockFrequency &BlockFrequency::operator/=(BranchProbability Prob) {
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Frequency = Prob.scaleByInverse(Frequency);
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return *this;
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}
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BlockFrequency BlockFrequency::operator/(BranchProbability Prob) const {
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BlockFrequency Freq(Frequency);
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Freq /= Prob;
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return Freq;
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}
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BlockFrequency &BlockFrequency::operator+=(BlockFrequency Freq) {
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uint64_t Before = Freq.Frequency;
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Frequency += Freq.Frequency;
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// If overflow, set frequency to the maximum value.
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if (Frequency < Before)
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Frequency = UINT64_MAX;
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return *this;
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}
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BlockFrequency BlockFrequency::operator+(BlockFrequency Freq) const {
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BlockFrequency NewFreq(Frequency);
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NewFreq += Freq;
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return NewFreq;
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}
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BlockFrequency &BlockFrequency::operator-=(BlockFrequency Freq) {
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// If underflow, set frequency to 0.
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if (Frequency <= Freq.Frequency)
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Frequency = 0;
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else
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Frequency -= Freq.Frequency;
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return *this;
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}
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BlockFrequency BlockFrequency::operator-(BlockFrequency Freq) const {
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BlockFrequency NewFreq(Frequency);
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NewFreq -= Freq;
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return NewFreq;
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}
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BlockFrequency &BlockFrequency::operator>>=(const unsigned count) {
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// Frequency can never be 0 by design.
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assert(Frequency != 0);
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// Shift right by count.
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Frequency >>= count;
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// Saturate to 1 if we are 0.
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Frequency |= Frequency == 0;
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return *this;
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}
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