Vendor import of llvm trunk r154661:

http://llvm.org/svn/llvm-project/llvm/trunk@r154661

1 files changed, 28 insertions, 3 deletions

diff --git a/include/llvm/Support/BranchProbability.h b/include/llvm/Support/BranchProbability.h
index 05c24d4..eedf692 100644
--- a/include/llvm/Support/BranchProbability.h
+++ b/include/llvm/Support/BranchProbability.h
@@ -15,6 +15,7 @@
 #define LLVM_SUPPORT_BRANCHPROBABILITY_H
 
 #include "llvm/Support/DataTypes.h"
+#include <cassert>
 
 namespace llvm {
 
@@ -22,7 +23,6 @@ class raw_ostream;
 
 // This class represents Branch Probability as a non-negative fraction.
 class BranchProbability {
-
   // Numerator
   uint32_t N;
 
@@ -30,19 +30,44 @@ class BranchProbability {
   uint32_t D;
 
 public:
-  BranchProbability(uint32_t n, uint32_t d);
+  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;
 
   void dump() 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 (uint64_t)N * RHS.D <= (uint64_t)D * RHS.N;
+  }
+  bool operator>=(BranchProbability RHS) const {
+    return RHS <= *this;
+  }
 };
 
 raw_ostream &operator<<(raw_ostream &OS, const BranchProbability &Prob);