src/cobalt/base/compiler.h

// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COBALT_BASE_COMPILER_H_
#define COBALT_BASE_COMPILER_H_

#if defined(STARBOARD)
#include "starboard/configuration.h"
#define LIKELY SB_LIKELY
#define UNLIKELY SB_UNLIKELY
#else

// Macro for hinting that an expression is likely to be true.
#if !defined(LIKELY)
  #if defined(__GNUC__)
    #define LIKELY(x) __builtin_expect(!!(x), 1)
  #elif defined(_MSC_VER)
    #define LIKELY(x) (x)
  #else
    #error unsupported compiler
  #endif  // defined(__GNUC__)
#endif  // !defined(LIKELY)

// Macro for hinting that an expression is likely to be false.
#if !defined(UNLIKELY)
  #if defined(__GNUC__)
    #define UNLIKELY(x) __builtin_expect(!!(x), 0)
  #elif defined(_MSC_VER)
    #define UNLIKELY(x) (x)
  #else
    #error unsupported compiler
  #endif  // defined(__GNUC__)
#endif  // !defined(UNLIKELY)

#endif  // defined(STARBOARD)

#endif  // COBALT_BASE_COMPILER_H_