compiler_extensions.h

来自「skyeye_1_2_2_Rel.rar 最新skyeye源码」· C头文件 代码 · 共 24 行

/*
 * ---------------------------------------------------
 * Use compiler builtins for better compilation
 * results. Taken from the linux kernel source
 * ---------------------------------------------------
 */
#ifndef COMPILER_EXTENSIONS_H
#define COMPILER_EXTENSIONS_H

#if __GNUC__ > 2
#define likely(x)       __builtin_expect(!!(x), 1)
#define unlikely(x)     __builtin_expect(!!(x), 0)
#else
#define likely(x)       x 
#define unlikely(x)     x 
#endif
#ifdef __GNUC__
#define UNUSED __attribute__((unused))
#else
#define UNUSED
#endif

#endif