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Add generic implementation of __bswap64

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This commit is contained in:
Joel Sherrill 2012-04-18 09:48:49 -05:00
parent d8c5df73f6
commit f084ec7edc
1 changed files with 16 additions and 0 deletions
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16
freebsd/sys/endian.h
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@ -197,4 +197,20 @@ le64enc(void *pp, uint64_t u)
le32enc(p + 4, u >> 32); le32enc(p + 4, u >> 32);
} }
/*
* In FreeBSD, this can be CPU specific but most targets use this
* implementation.
*
* This is from the powerpc implementation.
*/
static __inline uint64_t
__bswap64(uint64_t _x)
{
return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
((_x << 24) & ((__uint64_t)0xff << 40)) |
((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
}
#endif /* _SYS_ENDIAN_HH_ */ #endif /* _SYS_ENDIAN_HH_ */