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//====--------------- 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 "llvm/Support/BranchProbability.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/ScaledNumber.h"
#include "llvm/Support/raw_ostream.h"
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;
}
std::optional<BlockFrequency> BlockFrequency::mul(uint64_t Factor) const {
bool Overflow;
uint64_t ResultFrequency = SaturatingMultiply(Frequency, Factor, &Overflow);
if (Overflow)
return {};
return BlockFrequency(ResultFrequency);
}
void llvm::printRelativeBlockFreq(raw_ostream &OS, BlockFrequency EntryFreq,
BlockFrequency Freq) {
if (Freq == BlockFrequency(0)) {
OS << "0";
return;
}
if (EntryFreq == BlockFrequency(0)) {
OS << "<invalid BFI>";
return;
}
ScaledNumber<uint64_t> Block(Freq.getFrequency(), 0);
ScaledNumber<uint64_t> Entry(EntryFreq.getFrequency(), 0);
OS << Block / Entry;
}
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