Add BlockFrequency class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135992 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/BlockFrequency.h

@@ -0,0 +1,64 @@
+//===-------- BlockFrequency.h - Block Frequency Wrapper --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements Block Frequency class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_BLOCKFREQUENCY_H
+#define LLVM_SUPPORT_BLOCKFREQUENCY_H
+
+namespace llvm {
+
+class raw_ostream;
+class BranchProbability;
+
+// This class represents Block Frequency as a 64-bit value.
+class BlockFrequency {
+
+  uint64_t Frequency;
+
+  static void mult96bit(uint64_t freq, uint32_t N, uint64_t W[2]);
+  static uint64_t div96bit(uint64_t W[2], uint32_t D);
+
+public:
+  BlockFrequency(uint64_t Freq = 0) : Frequency(Freq) { }
+
+  uint64_t getFrequency() const { return Frequency; }
+
+  BlockFrequency &operator*=(const BranchProbability &Prob);
+  const BlockFrequency operator*(const BranchProbability &Prob) const;
+
+  BlockFrequency &operator+=(const BlockFrequency &Freq);
+  const BlockFrequency operator+(const BlockFrequency &Freq) const;
+
+  bool operator<(const BlockFrequency &RHS) const {
+    return Frequency < RHS.Frequency;
+  }
+
+  bool operator<=(const BlockFrequency &RHS) const {
+    return Frequency <= RHS.Frequency;
+  }
+
+  bool operator>(const BlockFrequency &RHS) const {
+    return Frequency > RHS.Frequency;
+  }
+
+  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