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- /* Macros to swap the order of bytes in integer values. m68k version.
- Copyright (C) 1997 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
- #if !defined _BYTESWAP_H && !defined _NETINET_IN_H
- # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
- #endif
- /* Swap bytes in 16 bit value. We don't provide an assembler version
- because GCC is smart enough to generate optimal assembler output, and
- this allows for better cse. */
- #define __bswap_16(x) \
- ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
- /* Swap bytes in 32 bit value. */
- #define __bswap_constant_32(x) \
- ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
- (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
- #if defined __GNUC__ && __GNUC__ >= 2
- # define __bswap_32(x) \
- __extension__ \
- ({ unsigned int __v; \
- if (__builtin_constant_p (x)) \
- __v = __bswap_constant_32 (x); \
- else \
- __asm__ __volatile__ ("ror%.w %#8, %0;" \
- "swap %0;" \
- "ror%.w %#8, %0" \
- : "=d" (__v) \
- : "0" (x)); \
- __v; })
- #else
- # define __bswap_32(x) __bswap_constant_32 (x)
- #endif
- #if defined __GNUC__ && __GNUC__ >= 2
- /* Swap bytes in 64 bit value. */
- # define __bswap_64(x) \
- __extension__ \
- ({ union { unsigned long long int __ll; \
- unsigned long int __l[2]; } __v, __r; \
- __v.__ll = (x); \
- __r.__l[0] = __bswap_32 (__v.__l[1]); \
- __r.__l[1] = __bswap_32 (__v.__l[0]); \
- __r.__ll; })
- #endif
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