Turn const/const& into value type for BlockFrequency in functions of this class....

[oota-llvm.git] / include / llvm / Support / BlockFrequency.h

diff --git a/include/llvm/Support/BlockFrequency.h b/include/llvm/Support/BlockFrequency.h
index 77b1bf44138a94625f0cf4325dc84cea4e0c8953..2dccfa26d8929c66694eef22e38a6e1ef6675c4f 100644 (file)
--- a/include/llvm/Support/BlockFrequency.h
+++ b/include/llvm/Support/BlockFrequency.h
@@ -14,24 +14,22 @@
 #ifndef LLVM_SUPPORT_BLOCKFREQUENCY_H
 #define LLVM_SUPPORT_BLOCKFREQUENCY_H
 
+#include "llvm/Support/BranchProbability.h"
 #include "llvm/Support/DataTypes.h"
 
 namespace llvm {
 
 class raw_ostream;
-class BranchProbability;
 
 // This class represents Block Frequency as a 64-bit value.
 class BlockFrequency {
-
   uint64_t Frequency;
-  static const int64_t ENTRY_FREQ = 1024;
 
 public:
   BlockFrequency(uint64_t Freq = 0) : Frequency(Freq) { }
 
-  /// \brief Returns the frequency of the entry block of the function.
-  static uint64_t getEntryFrequency() { return ENTRY_FREQ; }
+  /// \brief Returns the maximum possible frequency, the saturation value.
+  static uint64_t getMaxFrequency() { return -1ULL; }
 
   /// \brief Returns the frequency as a fixpoint number scaled by the entry
   /// frequency.
@@ -39,34 +37,38 @@ public:
 
   /// \brief Multiplies with a branch probability. The computation will never
   /// overflow.
-  BlockFrequency &operator*=(const BranchProbability &Prob);
-  const BlockFrequency operator*(const BranchProbability &Prob) const;
+  BlockFrequency &operator*=(BranchProbability Prob);
+  BlockFrequency operator*(BranchProbability Prob) const;
+
+  /// \brief Divide by a non-zero branch probability using saturating
+  /// arithmetic.
+  BlockFrequency &operator/=(BranchProbability Prob);
+  BlockFrequency operator/(BranchProbability Prob) const;
 
   /// \brief Adds another block frequency using saturating arithmetic.
-  BlockFrequency &operator+=(const BlockFrequency &Freq);
-  const BlockFrequency operator+(const BlockFrequency &Freq) const;
+  BlockFrequency &operator+=(BlockFrequency Freq);
+  BlockFrequency operator+(BlockFrequency Freq) const;
+
+  /// \brief Shift block frequency to the right by count digits saturating to 1.
+  BlockFrequency &operator>>=(const unsigned count);
 
-  bool operator<(const BlockFrequency &RHS) const {
+  bool operator<(BlockFrequency RHS) const {
     return Frequency < RHS.Frequency;
   }
 
-  bool operator<=(const BlockFrequency &RHS) const {
+  bool operator<=(BlockFrequency RHS) const {
     return Frequency <= RHS.Frequency;
   }
 
-  bool operator>(const BlockFrequency &RHS) const {
+  bool operator>(BlockFrequency RHS) const {
     return Frequency > RHS.Frequency;
   }
 
-  bool operator>=(const BlockFrequency &RHS) const {
+  bool operator>=(BlockFrequency RHS) const {
     return Frequency >= RHS.Frequency;
   }
-
-  void print(raw_ostream &OS) const;
 };
 
-raw_ostream &operator<<(raw_ostream &OS, const BlockFrequency &Freq);
-
 }
 
 #endif