| /* Macros to swap the order of bytes in 16-bit integer values. |
| Copyright (C) 1997-2014 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 |
| |
| #if defined __GNUC__ && __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__ __volatile__ ("shl %0 = %1, 48 ;;" \ |
| "mux1 %0 = %0, @rev ;;" \ |
| : "=r" (__v) \ |
| : "r" ((unsigned short int) (__x))); \ |
| __v; })) |
| #else |
| /* This is better than nothing. */ |
| static __inline unsigned short int |
| __bswap_16 (unsigned short int __bsx) |
| { |
| return __bswap_constant_16 (__bsx); |
| } |
| #endif |
