| /* |
| * Copyright 2017 Facebook, Inc. |
| * |
| * 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. |
| */ |
| |
| /** |
| * 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 |
