1 files changed, 81 insertions, 0 deletions
diff --git a/clang-r353983e/include/llvm/Support/BlockFrequency.h b/clang-r353983e/include/llvm/Support/BlockFrequency.h
new file mode 100644
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--- /dev/null
+++ b/clang-r353983e/include/llvm/Support/BlockFrequency.h
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+//===-------- BlockFrequency.h - Block Frequency Wrapper --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements Block Frequency class.
+//
+//===----------------------------------------------------------------------===//
+
+#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;
+
+// This class represents Block Frequency as a 64-bit value.
+class BlockFrequency {
+  uint64_t Frequency;
+
+public:
+  BlockFrequency(uint64_t Freq = 0) : Frequency(Freq) { }
+
+  /// Returns the maximum possible frequency, the saturation value.
+  static uint64_t getMaxFrequency() { return -1ULL; }
+
+  /// Returns the frequency as a fixpoint number scaled by the entry
+  /// frequency.
+  uint64_t getFrequency() const { return Frequency; }
+
+  /// Multiplies with a branch probability. The computation will never
+  /// overflow.
+  BlockFrequency &operator*=(BranchProbability Prob);
+  BlockFrequency operator*(BranchProbability Prob) const;
+
+  /// Divide by a non-zero branch probability using saturating
+  /// arithmetic.
+  BlockFrequency &operator/=(BranchProbability Prob);
+  BlockFrequency operator/(BranchProbability Prob) const;
+
+  /// Adds another block frequency using saturating arithmetic.
+  BlockFrequency &operator+=(BlockFrequency Freq);
+  BlockFrequency operator+(BlockFrequency Freq) const;
+
+  /// Subtracts another block frequency using saturating arithmetic.
+  BlockFrequency &operator-=(BlockFrequency Freq);
+  BlockFrequency operator-(BlockFrequency Freq) const;
+
+  /// Shift block frequency to the right by count digits saturating to 1.
+  BlockFrequency &operator>>=(const unsigned count);
+
+  bool operator<(BlockFrequency RHS) const {
+    return Frequency < RHS.Frequency;
+  }
+
+  bool operator<=(BlockFrequency RHS) const {
+    return Frequency <= RHS.Frequency;
+  }
+
+  bool operator>(BlockFrequency RHS) const {
+    return Frequency > RHS.Frequency;
+  }
+
+  bool operator>=(BlockFrequency RHS) const {
+    return Frequency >= RHS.Frequency;
+  }
+
+  bool operator==(BlockFrequency RHS) const {
+    return Frequency == RHS.Frequency;
+  }
+};
+
+}
+
+#endif