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annotate include/llvm/Support/BranchProbability.h @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children afa8332a0e37
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1 //===- BranchProbability.h - Branch Probability Wrapper ---------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // Definition of BranchProbability shared by IR and Machine Instructions.
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11 //
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12 //===----------------------------------------------------------------------===//
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14 #ifndef LLVM_SUPPORT_BRANCHPROBABILITY_H
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15 #define LLVM_SUPPORT_BRANCHPROBABILITY_H
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16
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17 #include "llvm/Support/DataTypes.h"
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18 #include <cassert>
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19
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20 namespace llvm {
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21
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22 class raw_ostream;
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23
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24 // This class represents Branch Probability as a non-negative fraction.
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25 class BranchProbability {
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26 // Numerator
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27 uint32_t N;
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28
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29 // Denominator
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30 uint32_t D;
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31
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32 public:
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33 BranchProbability(uint32_t n, uint32_t d) : N(n), D(d) {
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34 assert(d > 0 && "Denomiator cannot be 0!");
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35 assert(n <= d && "Probability cannot be bigger than 1!");
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36 }
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37
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38 static BranchProbability getZero() { return BranchProbability(0, 1); }
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39 static BranchProbability getOne() { return BranchProbability(1, 1); }
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40
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41 uint32_t getNumerator() const { return N; }
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42 uint32_t getDenominator() const { return D; }
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43
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44 // Return (1 - Probability).
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45 BranchProbability getCompl() const {
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46 return BranchProbability(D - N, D);
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47 }
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48
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49 raw_ostream &print(raw_ostream &OS) const;
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50
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51 void dump() const;
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52
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53 /// \brief Scale a large integer.
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54 ///
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55 /// Scales \c Num. Guarantees full precision. Returns the floor of the
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56 /// result.
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57 ///
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58 /// \return \c Num times \c this.
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59 uint64_t scale(uint64_t Num) const;
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60
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61 /// \brief Scale a large integer by the inverse.
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62 ///
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63 /// Scales \c Num by the inverse of \c this. Guarantees full precision.
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64 /// Returns the floor of the result.
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65 ///
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66 /// \return \c Num divided by \c this.
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67 uint64_t scaleByInverse(uint64_t Num) const;
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68
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69 bool operator==(BranchProbability RHS) const {
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70 return (uint64_t)N * RHS.D == (uint64_t)D * RHS.N;
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71 }
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72 bool operator!=(BranchProbability RHS) const {
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73 return !(*this == RHS);
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74 }
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75 bool operator<(BranchProbability RHS) const {
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76 return (uint64_t)N * RHS.D < (uint64_t)D * RHS.N;
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77 }
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78 bool operator>(BranchProbability RHS) const { return RHS < *this; }
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79 bool operator<=(BranchProbability RHS) const { return !(RHS < *this); }
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80 bool operator>=(BranchProbability RHS) const { return !(*this < RHS); }
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81 };
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82
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83 inline raw_ostream &operator<<(raw_ostream &OS, const BranchProbability &Prob) {
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84 return Prob.print(OS);
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85 }
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86
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87 }
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88
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89 #endif