| 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-exception |
| 6 | // |
| 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 | |
| 17 | using namespace llvm; |
| 18 | |
| 19 | BlockFrequency &BlockFrequency::operator*=(BranchProbability Prob) { |
| 20 | Frequency = Prob.scale(Num: Frequency); |
| 21 | return *this; |
| 22 | } |
| 23 | |
| 24 | BlockFrequency BlockFrequency::operator*(BranchProbability Prob) const { |
| 25 | BlockFrequency Freq(Frequency); |
| 26 | Freq *= Prob; |
| 27 | return Freq; |
| 28 | } |
| 29 | |
| 30 | BlockFrequency &BlockFrequency::operator/=(BranchProbability Prob) { |
| 31 | Frequency = Prob.scaleByInverse(Num: Frequency); |
| 32 | return *this; |
| 33 | } |
| 34 | |
| 35 | BlockFrequency BlockFrequency::operator/(BranchProbability Prob) const { |
| 36 | BlockFrequency Freq(Frequency); |
| 37 | Freq /= Prob; |
| 38 | return Freq; |
| 39 | } |
| 40 | |
| 41 | std::optional<BlockFrequency> BlockFrequency::mul(uint64_t Factor) const { |
| 42 | bool Overflow; |
| 43 | uint64_t ResultFrequency = SaturatingMultiply(X: Frequency, Y: Factor, ResultOverflowed: &Overflow); |
| 44 | if (Overflow) |
| 45 | return {}; |
| 46 | return BlockFrequency(ResultFrequency); |
| 47 | } |
| 48 |