4e513b7a01
evaluating them at compile time rather than at run time. As for x86 and amd64, this requires GCC and it's enabled only if __OPTIMIZE__ is defined (ie, if at least -O is used). Reviewed by: jake
123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/*-
|
|
* Copyright (c) 1987, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)endian.h 8.1 (Berkeley) 6/10/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_ENDIAN_H_
|
|
#define _MACHINE_ENDIAN_H_
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/_types.h>
|
|
|
|
/*
|
|
* Define the order of 32-bit words in 64-bit words.
|
|
*/
|
|
#define _QUAD_HIGHWORD 0
|
|
#define _QUAD_LOWWORD 1
|
|
|
|
/*
|
|
* Definitions for byte order, according to byte significance from low
|
|
* address to high.
|
|
*/
|
|
#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
|
|
#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
|
|
#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
|
|
|
|
#define _BYTE_ORDER _BIG_ENDIAN
|
|
|
|
/*
|
|
* Deprecated variants that don't have enough underscores to be useful in more
|
|
* strict namespaces.
|
|
*/
|
|
#if __BSD_VISIBLE
|
|
#define LITTLE_ENDIAN _LITTLE_ENDIAN
|
|
#define BIG_ENDIAN _BIG_ENDIAN
|
|
#define PDP_ENDIAN _PDP_ENDIAN
|
|
#define BYTE_ORDER _BYTE_ORDER
|
|
#endif
|
|
|
|
#if defined(__GNUC__) && defined(__OPTIMIZE__)
|
|
#define __is_constant(x) __builtin_constant_p(x)
|
|
#else
|
|
#define __is_constant(x) 0
|
|
#endif
|
|
|
|
#define __bswap16_const(x) ((x >> 8) | ((x << 8) & 0xff00))
|
|
#define __bswap32_const(x) ((x >> 24) | ((x >> 8) & 0xff00) | \
|
|
((x << 8) & 0xff0000) | ((x << 24) & 0xff000000))
|
|
#define __bswap64_const(x) ((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)))
|
|
|
|
static __inline __uint16_t
|
|
__bswap16_var(__uint16_t _x)
|
|
{
|
|
|
|
return ((_x >> 8) | ((_x << 8) & 0xff00));
|
|
}
|
|
|
|
static __inline __uint32_t
|
|
__bswap32_var(__uint32_t _x)
|
|
{
|
|
|
|
return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
|
|
((_x << 24) & 0xff000000));
|
|
}
|
|
|
|
static __inline __uint64_t
|
|
__bswap64_var(__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)));
|
|
}
|
|
|
|
#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))
|
|
|
|
#endif /* !_MACHINE_ENDIAN_H_ */
|