Define bswap macros for constants to allow the compiler to pre-compute
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
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=216122
@ -27,7 +27,6 @@
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* SUCH DAMAGE.
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*
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* @(#)endian.h 8.1 (Berkeley) 6/10/93
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* $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
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* $FreeBSD$
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*/
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@ -79,17 +78,36 @@
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#define BYTE_ORDER _BYTE_ORDER
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#endif
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#ifdef __CC_SUPPORTS___INLINE
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#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
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#define __is_constant(x) __builtin_constant_p(x)
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#else
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#define __is_constant(x) 0
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#endif
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#define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \
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(((__uint16_t)(x) << 8) & 0xff00))
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#define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \
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(((__uint32_t)(x) >> 8) & 0xff00) | \
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(((__uint32_t)(x)<< 8) & 0xff0000) | \
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(((__uint32_t)(x) << 24) & 0xff000000))
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#define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \
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(((__uint64_t)(x) >> 40) & 0xff00) | \
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(((__uint64_t)(x) >> 24) & 0xff0000) | \
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(((__uint64_t)(x) >> 8) & 0xff000000) | \
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(((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \
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(((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \
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(((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \
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(((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
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static __inline __uint16_t
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__bswap16(__uint16_t _x)
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__bswap16_var(__uint16_t _x)
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{
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return ((_x >> 8) | ((_x << 8) & 0xff00));
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}
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static __inline __uint32_t
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__bswap32(__uint32_t _x)
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__bswap32_var(__uint32_t _x)
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{
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return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
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@ -97,7 +115,7 @@ __bswap32(__uint32_t _x)
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}
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static __inline __uint64_t
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__bswap64(__uint64_t _x)
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__bswap64_var(__uint64_t _x)
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{
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return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
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@ -106,20 +124,16 @@ __bswap64(__uint64_t _x)
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((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
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}
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#define __bswap16(x) (__is_constant(x) ? __bswap16_const(x) : \
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__bswap16_var(x))
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#define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \
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__bswap32_var(x))
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#define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \
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__bswap64_var(x))
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#define __htonl(x) ((__uint32_t)(x))
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#define __htons(x) ((__uint16_t)(x))
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#define __ntohl(x) ((__uint32_t)(x))
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#define __ntohs(x) ((__uint16_t)(x))
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#else /* !__CC_SUPPORTS___INLINE */
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/*
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* No optimizations are available for this compiler. Fall back to
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* non-optimized functions by defining the constant usually used to prevent
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* redefinition.
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*/
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#define _BYTEORDER_FUNC_DEFINED
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#endif /* __CC_SUPPORTS___INLINE */
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#endif /* !_MACHINE_ENDIAN_H_ */
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