1 /* Macros to swap the order of bytes in integer values. 2 Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _ASM_BITS_BYTESWAP_H 20 #define _ASM_BITS_BYTESWAP_H 1 21 22 #define __bswap_non_constant_16(x) \ 23 (__extension__ \ 24 ({ register unsigned short int __v; \ 25 __asm__ __volatile__ ("shl %0 = %1, 48 ;;" \ 26 "mux1 %0 = %0, @rev ;;" \ 27 : "=r" (__v) \ 28 : "r" ((unsigned short int) (x))); \ 29 __v; })) 30 31 #define __bswap_non_constant_32(x) \ 32 (__extension__ \ 33 ({ register unsigned int __v; \ 34 __asm__ __volatile__ ("shl %0 = %1, 32 ;;" \ 35 "mux1 %0 = %0, @rev ;;" \ 36 : "=r" (__v) \ 37 : "r" ((unsigned int) (x))); \ 38 __v; })) 39 40 #define __bswap_non_constant_64(x) \ 41 (__extension__ \ 42 ({ register unsigned long int __v; \ 43 __asm__ __volatile__ ("mux1 %0 = %1, @rev ;;" \ 44 : "=r" (__v) \ 45 : "r" ((unsigned long int) (x))); \ 46 __v; })) 47 #endif 48 49 #include <bits/byteswap-common.h> 50