65 lines · cpp
1//====--------------- lib/Support/BlockFrequency.cpp -----------*- C++ -*-====//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// This file implements Block Frequency class.10//11//===----------------------------------------------------------------------===//12 13#include "llvm/Support/BlockFrequency.h"14#include "llvm/Support/BranchProbability.h"15#include "llvm/Support/MathExtras.h"16#include "llvm/Support/ScaledNumber.h"17#include "llvm/Support/raw_ostream.h"18 19using namespace llvm;20 21BlockFrequency &BlockFrequency::operator*=(BranchProbability Prob) {22 Frequency = Prob.scale(Frequency);23 return *this;24}25 26BlockFrequency BlockFrequency::operator*(BranchProbability Prob) const {27 BlockFrequency Freq(Frequency);28 Freq *= Prob;29 return Freq;30}31 32BlockFrequency &BlockFrequency::operator/=(BranchProbability Prob) {33 Frequency = Prob.scaleByInverse(Frequency);34 return *this;35}36 37BlockFrequency BlockFrequency::operator/(BranchProbability Prob) const {38 BlockFrequency Freq(Frequency);39 Freq /= Prob;40 return Freq;41}42 43std::optional<BlockFrequency> BlockFrequency::mul(uint64_t Factor) const {44 bool Overflow;45 uint64_t ResultFrequency = SaturatingMultiply(Frequency, Factor, &Overflow);46 if (Overflow)47 return {};48 return BlockFrequency(ResultFrequency);49}50 51void llvm::printRelativeBlockFreq(raw_ostream &OS, BlockFrequency EntryFreq,52 BlockFrequency Freq) {53 if (Freq == BlockFrequency(0)) {54 OS << "0";55 return;56 }57 if (EntryFreq == BlockFrequency(0)) {58 OS << "<invalid BFI>";59 return;60 }61 ScaledNumber<uint64_t> Block(Freq.getFrequency(), 0);62 ScaledNumber<uint64_t> Entry(EntryFreq.getFrequency(), 0);63 OS << Block / Entry;64}65