95b1d16df5
amd64/i386/pc98 endian.h with stubs. In __bswap64_const(x) the conflict between 0xffUL and 0xffULL has been resolved by reimplementing the macro in terms of __bswap32(x). As a side effect __bswap64_var(x) is now implemented using two bswap instructions on i386 and should be much faster. __bswap32_const(x) has been reimplemented in terms of __bswap16(x) for consistency.
139 lines
3.9 KiB
C
139 lines
3.9 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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#ifdef __cplusplus
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extern "C" {
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#endif
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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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#if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
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#define __bswap16_const(_x) (__uint16_t)((_x) << 8 | (_x) >> 8)
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#define __bswap16(_x) \
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(__builtin_constant_p(_x) ? \
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__bswap16_const((__uint16_t)(_x)) : __bswap16_var(_x))
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#define __bswap32_const(_x) \
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(((__uint32_t)__bswap16(_x) << 16) | __bswap16((_x) >> 16))
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#define __bswap32(_x) \
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(__builtin_constant_p(_x) ? \
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__bswap32_const((__uint32_t)(_x)) : __bswap32_var(_x))
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#define __bswap64_const(_x) \
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(((__uint64_t)__bswap32(_x) << 32) | __bswap32((_x) >> 32))
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#define __bswap64(_x) \
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(__builtin_constant_p(_x) ? \
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__bswap64_const((__uint64_t)(_x)) : __bswap64_var(_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_const(_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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__asm ("bswap %0" : "+r" (_x));
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return (_x);
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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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#ifdef _LP64
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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 (__bswap64_const(_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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#else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */
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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 /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */
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#ifdef __cplusplus
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}
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#endif
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#endif /* !_MACHINE_ENDIAN_H_ */
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