/* Macros to swap the order of bytes in integer values. m68k version. Copyright (C) 1997, 2002, 2008, 2011 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, 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 && !defined _ENDIAN_H # error "Never use directly; include instead." #endif #ifndef _BITS_BYTESWAP_H #define _BITS_BYTESWAP_H 1 /* 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_constant_16(x) \ ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)) static __inline unsigned short int __bswap_16 (unsigned short int __bsx) { return __bswap_constant_16 (__bsx); } /* Swap bytes in 32 bit value. */ #define __bswap_constant_32(x) \ ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) #if !defined(__mcoldfire__) static __inline unsigned int __bswap_32 (unsigned int __bsx) { if (__builtin_constant_p (__bsx)) return __bswap_constant_32 (__bsx); __asm__ __volatile__ ("ror%.w %#8, %0;" "swap %0;" "ror%.w %#8, %0" : "+d" (__bsx)); return __bsx; } #else static __inline unsigned int __bswap_32 (unsigned int __bsx) { return __bswap_constant_32 (__bsx); } #endif #if defined __GNUC__ && __GNUC__ >= 2 /* Swap bytes in 64 bit value. */ # define __bswap_constant_64(x) \ __extension__ \ ((((x) & 0xff00000000000000ull) >> 56) \ | (((x) & 0x00ff000000000000ull) >> 40) \ | (((x) & 0x0000ff0000000000ull) >> 24) \ | (((x) & 0x000000ff00000000ull) >> 8) \ | (((x) & 0x00000000ff000000ull) << 8) \ | (((x) & 0x0000000000ff0000ull) << 24) \ | (((x) & 0x000000000000ff00ull) << 40) \ | (((x) & 0x00000000000000ffull) << 56)) /* Swap bytes in 64 bit value. */ static __inline unsigned long long __bswap_64 (unsigned long long __bsx) { if (__builtin_constant_p (__bsx)) return __bswap_constant_64 (__bsx); return (__bswap_32 (__bsx >> 32) | ((unsigned long long) __bswap_32 (__bsx) << 32)); } #endif #endif /* _BITS_BYTESWAP_H */