likely.h

 
#ifndef LIKELY_H_
#define LIKELY_H_
 
#if defined(__GNUC__) && __GNUC__ >= 3
#define likely(x) __builtin_expect (x, 1)
#define unlikely(x) __builtin_expect (x, 0)
#else
#define likely(x) (x)
#define unlikely(x) (x)
#endif
 
#endif /* LIKELY_H_ */