| /* |
| * Copyright (c) 2016-present, Facebook, Inc. |
| * All rights reserved. |
| * |
| * This source code is licensed under both the BSD-style license (found in the |
| * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
| * in the COPYING file in the root directory of this source tree). |
| */ |
| |
| /** |
| * Compiler hints to indicate the fast path of an "if" branch: whether |
| * the if condition is likely to be true or false. |
| * |
| * @author Tudor Bosman (tudorb@fb.com) |
| */ |
| |
| #pragma once |
| |
| #undef LIKELY |
| #undef UNLIKELY |
| |
| #if defined(__GNUC__) && __GNUC__ >= 4 |
| #define LIKELY(x) (__builtin_expect((x), 1)) |
| #define UNLIKELY(x) (__builtin_expect((x), 0)) |
| #else |
| #define LIKELY(x) (x) |
| #define UNLIKELY(x) (x) |
| #endif |
