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test |
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# unlikely | ||
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GCC branch prediction macros. | ||
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## API | ||
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```c | ||
likely(expr) | ||
unlikely(expr) | ||
``` |
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name: unlikely | ||
version: 0.0.1 | ||
description: branch prediction macros | ||
tags: macro unlikely branch gcc | ||
author: TJ Holowaychuk <tj@vision-media.ca> | ||
url: http://github.com/visionmedia/unlikely.c | ||
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// | ||
// unlikely.h | ||
// | ||
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#ifndef UNLIKELY_H | ||
#define UNLIKELY_H | ||
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#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__) | ||
#define likely(expr) __builtin_expect((expr), 1) | ||
#define unlikely(expr) __builtin_expect((expr), 0) | ||
#else | ||
#define likely(expr) (expr) | ||
#define unlikely(expr) (expr) | ||
#endif | ||
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#endif |