Cleaning up static initializers in TimeValue.

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

diff --git a/include/llvm/Support/BranchProbability.h b/include/llvm/Support/BranchProbability.h
index a1e5ceb6255b8e976c52a100e845cf654cbe442d..9aab6ace6e3f0e249ec027157a72d56eea81bf3d 100644 (file)
--- a/include/llvm/Support/BranchProbability.h
+++ b/include/llvm/Support/BranchProbability.h
@@ -29,37 +29,60 @@ class BranchProbability {
   // Denominator
   uint32_t D;
 
-  int64_t compare(BranchProbability RHS) const {
-    return (uint64_t)N * RHS.D - (uint64_t)D * RHS.N;
-  }
-
 public:
   BranchProbability(uint32_t n, uint32_t d) : N(n), D(d) {
     assert(d > 0 && "Denomiator cannot be 0!");
     assert(n <= d && "Probability cannot be bigger than 1!");
   }
 
+  static BranchProbability getZero() { return BranchProbability(0, 1); }
+  static BranchProbability getOne() { return BranchProbability(1, 1); }
+
   uint32_t getNumerator() const { return N; }
   uint32_t getDenominator() const { return D; }
 
   // Return (1 - Probability).
-  BranchProbability getCompl() {
+  BranchProbability getCompl() const {
     return BranchProbability(D - N, D);
   }
 
-  void print(raw_ostream &OS) const;
+  raw_ostream &print(raw_ostream &OS) const;
 
   void dump() const;
 
-  bool operator==(BranchProbability RHS) const { return compare(RHS) == 0; }
-  bool operator!=(BranchProbability RHS) const { return compare(RHS) != 0; }
-  bool operator< (BranchProbability RHS) const { return compare(RHS) <  0; }
-  bool operator> (BranchProbability RHS) const { return compare(RHS) >  0; }
-  bool operator<=(BranchProbability RHS) const { return compare(RHS) <= 0; }
-  bool operator>=(BranchProbability RHS) const { return compare(RHS) >= 0; }
+  /// \brief Scale a large integer.
+  ///
+  /// Scales \c Num.  Guarantees full precision.  Returns the floor of the
+  /// result.
+  ///
+  /// \return \c Num times \c this.
+  uint64_t scale(uint64_t Num) const;
+
+  /// \brief Scale a large integer by the inverse.
+  ///
+  /// Scales \c Num by the inverse of \c this.  Guarantees full precision.
+  /// Returns the floor of the result.
+  ///
+  /// \return \c Num divided by \c this.
+  uint64_t scaleByInverse(uint64_t Num) const;
+
+  bool operator==(BranchProbability RHS) const {
+    return (uint64_t)N * RHS.D == (uint64_t)D * RHS.N;
+  }
+  bool operator!=(BranchProbability RHS) const {
+    return !(*this == RHS);
+  }
+  bool operator<(BranchProbability RHS) const {
+    return (uint64_t)N * RHS.D < (uint64_t)D * RHS.N;
+  }
+  bool operator>(BranchProbability RHS) const { return RHS < *this; }
+  bool operator<=(BranchProbability RHS) const { return !(RHS < *this); }
+  bool operator>=(BranchProbability RHS) const { return !(*this < RHS); }
 };
 
-raw_ostream &operator<<(raw_ostream &OS, const BranchProbability &Prob);
+inline raw_ostream &operator<<(raw_ostream &OS, const BranchProbability &Prob) {
+  return Prob.print(OS);
+}
 
 }