| /* 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 <bits/byteswap.h> directly; include <byteswap.h> 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 */ |