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#ifndef _COMPILER_H_
#define _COMPILER_H_
#include <stdint.h>
#ifdef __GNUC__
# define __packed __attribute__ ((packed))
# define __unused __attribute__ ((unused))
# define __noreturn __attribute__ ((noreturn))
# define likely(x) __builtin_expect(!!(x), 1)
# define unlikely(x) __builtin_expect(!!(x), 0)
static inline void prefetch(const void *ptr)
{
/* We could use some arch specific instructions here, but a GCC builtin
is fine for now */
__builtin_prefetch(ptr, 0, 3);
}
static inline int32_t bswap_32(int32_t x)
{
return __builtin_bswap32(x);
}
#else
# define __packed
# define __unused
# define __noreturn
# define likely(x) (x)
# define unlikely(x) (x)
static inline prefetch(const void *ptr)
{
/* empty */
}
static inline int32_t bswap_32(int32_t x)
{
int32_t ret = 0;
ret |= ((x & 0xFF000000) >> 24);
ret |= ((x & 0x00FF0000) >> 8);
ret |= ((x & 0x0000FF00) << 8);
ret |= ((x & 0x000000FF) << 24);
return ret;
}
#endif /* __GNUC__ */
#ifndef offsetof
# define offsetof(type, member) ((size_t) &((type *)0)->member)
#endif /* offsetof */
#ifndef container_of
# define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type, member) );})
#endif /* container_of */
#endif /* _COMPILER_H_ */
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