1 //===- BranchProbability.h - Branch Probability Wrapper ---------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Definition of BranchProbability shared by IR and Machine Instructions. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_SUPPORT_BRANCHPROBABILITY_H 15 #define LLVM_SUPPORT_BRANCHPROBABILITY_H 16 17 #include "llvm/Support/DataTypes.h" 18 19 namespace llvm { 20 21 class raw_ostream; 22 23 // This class represents Branch Probability as a non-negative fraction. 24 class BranchProbability { 25 26 // Numerator 27 uint32_t N; 28 29 // Denominator 30 uint32_t D; 31 32 public: 33 BranchProbability(uint32_t n, uint32_t d); 34 35 uint32_t getNumerator() const { return N; } 36 uint32_t getDenominator() const { return D; } 37 38 // Return (1 - Probability). 39 BranchProbability getCompl() { 40 return BranchProbability(D - N, D); 41 } 42 43 void print(raw_ostream &OS) const; 44 45 void dump() const; 46 }; 47 48 raw_ostream &operator<<(raw_ostream &OS, const BranchProbability &Prob); 49 50 } 51 52 #endif 53
