Revert r200340, "Add line table debug info to COFF files when using a win32 triple."

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

diff --git a/include/llvm/Support/BlockFrequency.h b/include/llvm/Support/BlockFrequency.h
index 257888f8d0c1805b7374845f04afcc938d5b9e5c..dae520b54e482e121d2cf9ba5eba221d4f5e739d 100644 (file)
--- a/include/llvm/Support/BlockFrequency.h
+++ b/include/llvm/Support/BlockFrequency.h
@@ -25,28 +25,43 @@ class BranchProbability;
 class BlockFrequency {
 
   uint64_t Frequency;
-  static const int64_t ENTRY_FREQ = 1024;
+
+  /// \brief Scale the given BlockFrequency by N/D. Return the remainder from
+  /// the division by D. Upon overflow, the routine will saturate and
+  /// additionally will return the remainder set to D.
+  uint32_t scale(uint32_t N, uint32_t D);
 
 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.
   uint64_t getFrequency() const { return Frequency; }
 
   /// \brief Multiplies with a branch probability. The computation will never
-  /// overflow. If the result is equal to zero but the input wasn't this method
-  /// will return a frequency of one.
+  /// overflow.
   BlockFrequency &operator*=(const BranchProbability &Prob);
   const BlockFrequency operator*(const BranchProbability &Prob) const;
 
+  /// \brief Divide by a non-zero branch probability using saturating
+  /// arithmetic.
+  BlockFrequency &operator/=(const BranchProbability &Prob);
+  BlockFrequency operator/(const BranchProbability &Prob) const;
+
   /// \brief Adds another block frequency using saturating arithmetic.
   BlockFrequency &operator+=(const BlockFrequency &Freq);
   const BlockFrequency operator+(const BlockFrequency &Freq) const;
 
+  /// \brief Shift block frequency to the right by count digits saturating to 1.
+  BlockFrequency &operator>>=(const unsigned count);
+
+  /// \brief Scale the given BlockFrequency by N/D. Return the remainder from
+  /// the division by D. Upon overflow, the routine will saturate.
+  uint32_t scale(const BranchProbability &Prob);
+
   bool operator<(const BlockFrequency &RHS) const {
     return Frequency < RHS.Frequency;
   }
@@ -62,12 +77,8 @@ public:
   bool operator>=(const BlockFrequency &RHS) const {
     return Frequency >= RHS.Frequency;
   }
-
-  void print(raw_ostream &OS) const;
 };
 
-raw_ostream &operator<<(raw_ostream &OS, const BlockFrequency &Freq);
-
 }
 
 #endif