d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Define bswap macros for constants to allow the compiler to pre-compute

Browse Source 
byte-swapped versions of compile-time constants. This allows use of
bswap() and htole*() in initializers, which is required to cross-build
btxld.

Obtained from:	sparc64
This commit is contained in:
Nathan Whitehorn 2010-12-02 15:10:27 +00:00
parent da1e775d12
commit e2c3e32a6c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216122
1 changed files with 30 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
sys/powerpc/include/endian.h
View File

@ -27,7 +27,6 @@
* SUCH DAMAGE.
*
* @(#)endian.h 8.1 (Berkeley) 6/10/93
* $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
* $FreeBSD$
*/
@ -79,17 +78,36 @@
#define BYTE_ORDER _BYTE_ORDER
#endif
#ifdef __CC_SUPPORTS___INLINE
#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
#define __is_constant(x) __builtin_constant_p(x)
#else
#define __is_constant(x) 0
#endif
#define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \
(((__uint16_t)(x) << 8) & 0xff00))
#define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \
(((__uint32_t)(x) >> 8) & 0xff00) | \
(((__uint32_t)(x)<< 8) & 0xff0000) | \
(((__uint32_t)(x) << 24) & 0xff000000))
#define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \
(((__uint64_t)(x) >> 40) & 0xff00) | \
(((__uint64_t)(x) >> 24) & 0xff0000) | \
(((__uint64_t)(x) >> 8) & 0xff000000) | \
(((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \
(((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \
(((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \
(((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
static __inline __uint16_t
__bswap16(__uint16_t _x)
__bswap16_var(__uint16_t _x)
{
return ((_x >> 8) | ((_x << 8) & 0xff00));
}
static __inline __uint32_t
__bswap32(__uint32_t _x)
__bswap32_var(__uint32_t _x)
{
return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
@ -97,7 +115,7 @@ __bswap32(__uint32_t _x)
}
static __inline __uint64_t
__bswap64(__uint64_t _x)
__bswap64_var(__uint64_t _x)
{
return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
@ -106,20 +124,16 @@ __bswap64(__uint64_t _x)
((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
}
#define __bswap16(x) (__is_constant(x) ? __bswap16_const(x) : \
__bswap16_var(x))
#define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \
__bswap32_var(x))
#define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \
__bswap64_var(x))
#define __htonl(x) ((__uint32_t)(x))
#define __htons(x) ((__uint16_t)(x))
#define __ntohl(x) ((__uint32_t)(x))
#define __ntohs(x) ((__uint16_t)(x))
#else /* !__CC_SUPPORTS___INLINE */
/*
* No optimizations are available for this compiler. Fall back to
* non-optimized functions by defining the constant usually used to prevent
* redefinition.
*/
#define _BYTEORDER_FUNC_DEFINED
#endif /* __CC_SUPPORTS___INLINE */
#endif /* !_MACHINE_ENDIAN_H_ */