1 /* Copyright (C) 2011-2018 Free Software Foundation, Inc. 2 3 The GNU C Library is free software; you can redistribute it and/or 4 modify it under the terms of the GNU Lesser General Public 5 License as published by the Free Software Foundation; either 6 version 2.1 of the License, or (at your option) any later version. 7 8 The GNU C Library is distributed in the hope that it will be useful, 9 but WITHOUT ANY WARRANTY; without even the implied warranty of 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 Lesser General Public License for more details. 12 13 You should have received a copy of the GNU Lesser General Public 14 License along with the GNU C Library. If not, see 15 <http://www.gnu.org/licenses/>. */ 16 17 #if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H 18 # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." 19 #endif 20 21 #ifndef _BITS_BYTESWAP_H 22 #define _BITS_BYTESWAP_H 1 23 24 #include <bits/types.h> 25 26 /* gcc __builtin_bswap64() can constant-fold, etc, so always use it. */ 27 #define __bswap_16(x) ((unsigned short)(__builtin_bswap32(x) >> 16)) 28 #define __bswap_32(x) ((unsigned int)__builtin_bswap32(x)) 29 #define __bswap_64(x) ((__uint64_t)__builtin_bswap64(x)) 30 31 #define __bswap_constant_16(x) __bswap_16(x) 32 #define __bswap_constant_32(x) __bswap_32(x) 33 #define __bswap_constant_64(x) __bswap_64(x) 34 35 #endif /* _BITS_BYTESWAP_H */ 36