unlikely.h

#ifndef UNLIKELY_H
#define UNLIKELY_H

#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

#endif