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c69dc1873d
Change `BlockFrequency` to defer to `BranchProbability::scale()` and `BranchProbability::scaleByInverse()`. This removes `BlockFrequency::scale()` from its API (and drops the ability to see the remainder), but the only user was the unit tests. If some code in the future needs an API that exposes the remainder, we can add something to `BranchProbability`, but I find that unlikely. llvm-svn: 207550
73 lines
1.9 KiB
C++
73 lines
1.9 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/BranchProbability.h"
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#include "llvm/Support/BlockFrequency.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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using namespace llvm;
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BlockFrequency &BlockFrequency::operator*=(const BranchProbability &Prob) {
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Frequency = Prob.scale(Frequency);
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return *this;
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}
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const BlockFrequency
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BlockFrequency::operator*(const 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/=(const 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/(const 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+=(const 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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const BlockFrequency
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BlockFrequency::operator+(const BlockFrequency &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>>=(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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