83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
//====--------------- lib/Support/BlockFrequency.cpp -----------*- C++ -*-====//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements Block Frequency class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/BlockFrequency.h"
|
|
#include <cassert>
|
|
|
|
using namespace llvm;
|
|
|
|
BlockFrequency &BlockFrequency::operator*=(BranchProbability Prob) {
|
|
Frequency = Prob.scale(Frequency);
|
|
return *this;
|
|
}
|
|
|
|
BlockFrequency BlockFrequency::operator*(BranchProbability Prob) const {
|
|
BlockFrequency Freq(Frequency);
|
|
Freq *= Prob;
|
|
return Freq;
|
|
}
|
|
|
|
BlockFrequency &BlockFrequency::operator/=(BranchProbability Prob) {
|
|
Frequency = Prob.scaleByInverse(Frequency);
|
|
return *this;
|
|
}
|
|
|
|
BlockFrequency BlockFrequency::operator/(BranchProbability Prob) const {
|
|
BlockFrequency Freq(Frequency);
|
|
Freq /= Prob;
|
|
return Freq;
|
|
}
|
|
|
|
BlockFrequency &BlockFrequency::operator+=(BlockFrequency Freq) {
|
|
uint64_t Before = Freq.Frequency;
|
|
Frequency += Freq.Frequency;
|
|
|
|
// If overflow, set frequency to the maximum value.
|
|
if (Frequency < Before)
|
|
Frequency = UINT64_MAX;
|
|
|
|
return *this;
|
|
}
|
|
|
|
BlockFrequency BlockFrequency::operator+(BlockFrequency Freq) const {
|
|
BlockFrequency NewFreq(Frequency);
|
|
NewFreq += Freq;
|
|
return NewFreq;
|
|
}
|
|
|
|
BlockFrequency &BlockFrequency::operator-=(BlockFrequency Freq) {
|
|
// If underflow, set frequency to 0.
|
|
if (Frequency <= Freq.Frequency)
|
|
Frequency = 0;
|
|
else
|
|
Frequency -= Freq.Frequency;
|
|
return *this;
|
|
}
|
|
|
|
BlockFrequency BlockFrequency::operator-(BlockFrequency Freq) const {
|
|
BlockFrequency NewFreq(Frequency);
|
|
NewFreq -= Freq;
|
|
return NewFreq;
|
|
}
|
|
|
|
BlockFrequency &BlockFrequency::operator>>=(const unsigned count) {
|
|
// Frequency can never be 0 by design.
|
|
assert(Frequency != 0);
|
|
|
|
// Shift right by count.
|
|
Frequency >>= count;
|
|
|
|
// Saturate to 1 if we are 0.
|
|
Frequency |= Frequency == 0;
|
|
return *this;
|
|
}
|