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annotate include/llvm/Support/BlockFrequency.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===-------- BlockFrequency.h - Block Frequency 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 // This file implements Block Frequency class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_SUPPORT_BLOCKFREQUENCY_H
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15 #define LLVM_SUPPORT_BLOCKFREQUENCY_H
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16
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17 #include "llvm/Support/DataTypes.h"
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18
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19 namespace llvm {
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20
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21 class raw_ostream;
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22 class BranchProbability;
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23
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24 // This class represents Block Frequency as a 64-bit value.
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25 class BlockFrequency {
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26 uint64_t Frequency;
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27
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28 public:
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29 BlockFrequency(uint64_t Freq = 0) : Frequency(Freq) { }
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30
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31 /// \brief Returns the maximum possible frequency, the saturation value.
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32 static uint64_t getMaxFrequency() { return -1ULL; }
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33
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34 /// \brief Returns the frequency as a fixpoint number scaled by the entry
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35 /// frequency.
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36 uint64_t getFrequency() const { return Frequency; }
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37
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38 /// \brief Multiplies with a branch probability. The computation will never
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39 /// overflow.
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40 BlockFrequency &operator*=(const BranchProbability &Prob);
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41 const BlockFrequency operator*(const BranchProbability &Prob) const;
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42
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43 /// \brief Divide by a non-zero branch probability using saturating
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44 /// arithmetic.
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45 BlockFrequency &operator/=(const BranchProbability &Prob);
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46 BlockFrequency operator/(const BranchProbability &Prob) const;
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47
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48 /// \brief Adds another block frequency using saturating arithmetic.
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49 BlockFrequency &operator+=(const BlockFrequency &Freq);
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50 const BlockFrequency operator+(const BlockFrequency &Freq) const;
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51
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52 /// \brief Shift block frequency to the right by count digits saturating to 1.
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53 BlockFrequency &operator>>=(const unsigned count);
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54
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55 bool operator<(const BlockFrequency &RHS) const {
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56 return Frequency < RHS.Frequency;
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57 }
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58
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59 bool operator<=(const BlockFrequency &RHS) const {
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60 return Frequency <= RHS.Frequency;
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61 }
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62
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63 bool operator>(const BlockFrequency &RHS) const {
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64 return Frequency > RHS.Frequency;
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65 }
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66
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67 bool operator>=(const BlockFrequency &RHS) const {
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68 return Frequency >= RHS.Frequency;
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69 }
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70 };
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71
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72 }
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73
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74 #endif