| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849 |
- /* Macros to swap the order of bytes in 16-bit integer values.
- Copyright (C) 2012-2016 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 Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 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
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #ifndef _BITS_BYTESWAP_H
- # error "Never use <bits/byteswap-16.h> directly; include <byteswap.h> instead."
- #endif
- #ifdef __GNUC__
- # if __GNUC__ >= 2
- # define __bswap_16(x) \
- (__extension__ \
- ({ unsigned short int __v, __x = (unsigned short int) (x); \
- if (__builtin_constant_p (__x)) \
- __v = __bswap_constant_16 (__x); \
- else \
- __asm__ ("rorw $8, %w0" \
- : "=r" (__v) \
- : "0" (__x) \
- : "cc"); \
- __v; }))
- # else
- /* This is better than nothing. */
- # define __bswap_16(x) \
- (__extension__ \
- ({ unsigned short int __x = (unsigned short int) (x); \
- __bswap_constant_16 (__x); }))
- # endif
- #else
- static __inline unsigned short int
- __bswap_16 (unsigned short int __bsx)
- {
- return __bswap_constant_16 (__bsx);
- }
- #endif
|
