4715a95fb4
revision has two problems: - It can produce worse code with both clang and gcc. - It doesn't fix the actual issue introduced in r232721, which will be fixed in the next commit. Submitted by: bde, tijl and jh Pointy hat to: dim
132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/*-
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* Copyright (c) 1987, 1991 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)endian.h 7.8 (Berkeley) 4/3/91
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* $FreeBSD$
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*/
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#ifndef _MACHINE_ENDIAN_H_
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#define _MACHINE_ENDIAN_H_
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#include <sys/cdefs.h>
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#include <sys/_types.h>
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/*
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* Define the order of 32-bit words in 64-bit words.
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*/
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#define _QUAD_HIGHWORD 1
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#define _QUAD_LOWWORD 0
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/*
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* Definitions for byte order, according to byte significance from low
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* address to high.
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*/
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#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
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#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
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#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
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#define _BYTE_ORDER _LITTLE_ENDIAN
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/*
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* Deprecated variants that don't have enough underscores to be useful in more
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* strict namespaces.
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*/
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#if __BSD_VISIBLE
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#define LITTLE_ENDIAN _LITTLE_ENDIAN
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#define BIG_ENDIAN _BIG_ENDIAN
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#define PDP_ENDIAN _PDP_ENDIAN
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#define BYTE_ORDER _BYTE_ORDER
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#endif
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#define __bswap16_gen(x) (__uint16_t)((x) << 8 | (x) >> 8)
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#define __bswap32_gen(x) \
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(((__uint32_t)__bswap16(x) << 16) | __bswap16((x) >> 16))
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#define __bswap64_gen(x) \
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(((__uint64_t)__bswap32(x) << 32) | __bswap32((x) >> 32))
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#ifdef __GNUCLIKE_BUILTIN_CONSTANT_P
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#define __bswap16(x) \
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((__uint16_t)(__builtin_constant_p(x) ? \
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__bswap16_gen((__uint16_t)(x)) : __bswap16_var(x)))
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#define __bswap32(x) \
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(__builtin_constant_p(x) ? \
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__bswap32_gen((__uint32_t)(x)) : __bswap32_var(x))
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#define __bswap64(x) \
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(__builtin_constant_p(x) ? \
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__bswap64_gen((__uint64_t)(x)) : __bswap64_var(x))
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#else
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/* XXX these are broken for use in static initializers. */
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#define __bswap16(x) __bswap16_var(x)
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#define __bswap32(x) __bswap32_var(x)
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#define __bswap64(x) __bswap64_var(x)
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#endif
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/* These are defined as functions to avoid multiple evaluation of x. */
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static __inline __uint16_t
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__bswap16_var(__uint16_t _x)
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{
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return (__bswap16_gen(_x));
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}
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static __inline __uint32_t
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__bswap32_var(__uint32_t _x)
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{
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#ifdef __GNUCLIKE_ASM
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__asm("bswap %0" : "+r" (_x));
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return (_x);
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#else
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return (__bswap32_gen(_x));
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#endif
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}
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static __inline __uint64_t
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__bswap64_var(__uint64_t _x)
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{
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#if defined(__amd64__) && defined(__GNUCLIKE_ASM)
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__asm("bswap %0" : "+r" (_x));
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return (_x);
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#else
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/*
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* It is important for the optimizations that the following is not
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* really generic, but expands to 2 __bswap32_var()'s.
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*/
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return (__bswap64_gen(_x));
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#endif
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}
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#define __htonl(x) __bswap32(x)
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#define __htons(x) __bswap16(x)
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#define __ntohl(x) __bswap32(x)
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#define __ntohs(x) __bswap16(x)
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#endif /* !_MACHINE_ENDIAN_H_ */
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