contrib/llvm/include/llvm/Support/BlockFrequency.h

   1 //===-------- BlockFrequency.h - Block Frequency 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 // This file implements Block Frequency class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_SUPPORT_BLOCKFREQUENCY_H
  15 #define LLVM_SUPPORT_BLOCKFREQUENCY_H
  16
  17 #include "llvm/Support/DataTypes.h"
  18
  19 namespace llvm {
  20
  21 class raw_ostream;
  22 class BranchProbability;
  23
  24 // This class represents Block Frequency as a 64-bit value.
  25 class BlockFrequency {
  26
  27   uint64_t Frequency;
  28   static const int64_t ENTRY_FREQ = 1024;
  29
  30 public:
  31   BlockFrequency(uint64_t Freq = 0) : Frequency(Freq) { }
  32
  33   static uint64_t getEntryFrequency() { return ENTRY_FREQ; }
  34   uint64_t getFrequency() const { return Frequency; }
  35
  36   BlockFrequency &operator*=(const BranchProbability &Prob);
  37   const BlockFrequency operator*(const BranchProbability &Prob) const;
  38
  39   BlockFrequency &operator+=(const BlockFrequency &Freq);
  40   const BlockFrequency operator+(const BlockFrequency &Freq) const;
  41
  42   bool operator<(const BlockFrequency &RHS) const {
  43     return Frequency < RHS.Frequency;
  44   }
  45
  46   bool operator<=(const BlockFrequency &RHS) const {
  47     return Frequency <= RHS.Frequency;
  48   }
  49
  50   bool operator>(const BlockFrequency &RHS) const {
  51     return Frequency > RHS.Frequency;
  52   }
  53
  54   bool operator>=(const BlockFrequency &RHS) const {
  55     return Frequency >= RHS.Frequency;
  56   }
  57
  58   void print(raw_ostream &OS) const;
  59 };
  60
  61 raw_ostream &operator<<(raw_ostream &OS, const BlockFrequency &Freq);
  62
  63 }
  64
  65 #endif