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- #ifndef _BITS_BYTESWAP_H
- #define _BITS_BYTESWAP_H 1
- #define ___swab16(x) \
- ({ \
- unsigned short __x = (x); \
- ((unsigned short)( \
- (((unsigned short)(__x) & (unsigned short)0x00ffU) << 8) | \
- (((unsigned short)(__x) & (unsigned short)0xff00U) >> 8) )); \
- })
- #define ___swab32(x) \
- ({ \
- unsigned long __x = (x); \
- ((unsigned long)( \
- (((unsigned long)(__x) & (unsigned long)0x000000ffUL) << 24) | \
- (((unsigned long)(__x) & (unsigned long)0x0000ff00UL) << 8) | \
- (((unsigned long)(__x) & (unsigned long)0x00ff0000UL) >> 8) | \
- (((unsigned long)(__x) & (unsigned long)0xff000000UL) >> 24) )); \
- })
- /* these are CRIS specific */
- static inline unsigned short __fswab16(unsigned short x)
- {
- __asm__ ("swapb %0" : "=r" (x) : "0" (x));
-
- return(x);
- }
- static inline unsigned long __fswab32(unsigned long x)
- {
- __asm__ ("swapwb %0" : "=r" (x) : "0" (x));
-
- return(x);
- }
- # define __bswap_16(x) \
- (__builtin_constant_p((unsigned short)(x)) ? \
- ___swab16((x)) : \
- __fswab16((x)))
- # define __bswap_32(x) \
- (__builtin_constant_p((unsigned long)(x)) ? \
- ___swab32((x)) : \
- __fswab32((x)))
- #if defined __GNUC__ && __GNUC__ >= 2
- /* Swap bytes in 64 bit value. */
- # define __bswap_constant_64(x) \
- ((((x) & 0xff00000000000000ull) >> 56) \
- | (((x) & 0x00ff000000000000ull) >> 40) \
- | (((x) & 0x0000ff0000000000ull) >> 24) \
- | (((x) & 0x000000ff00000000ull) >> 8) \
- | (((x) & 0x00000000ff000000ull) << 8) \
- | (((x) & 0x0000000000ff0000ull) << 24) \
- | (((x) & 0x000000000000ff00ull) << 40) \
- | (((x) & 0x00000000000000ffull) << 56))
- # define __bswap_64(x) \
- (__extension__ \
- ({ union { __extension__ unsigned long long int __ll; \
- unsigned int __l[2]; } __w, __r; \
- if (__builtin_constant_p (x)) \
- __r.__ll = __bswap_constant_64 (x); \
- else \
- { \
- __w.__ll = (x); \
- __r.__l[0] = __bswap_32 (__w.__l[1]); \
- __r.__l[1] = __bswap_32 (__w.__l[0]); \
- } \
- __r.__ll; }))
- #endif
- #endif /* _BITS_BYTESWAP_H */
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