| /* Macros to swap the order of bytes in integer values. |
| Copyright (C) 1997,1998,2000,2002,2003,2008 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. */ |
| #define __bswap_constant_16(x) \ |
| ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)) |
| |
| #if defined __GNUC__ && __GNUC__ >= 2 |
| # define __bswap_16(x) \ |
| (__extension__ \ |
| ({ register unsigned short int __v, __x = (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 |
| |
| |
| /* Swap bytes in 32 bit value. */ |
| #define __bswap_constant_32(x) \ |
| ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ |
| (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) |
| |
| #if defined __GNUC__ && __GNUC__ >= 2 |
| # define __bswap_32(x) \ |
| (__extension__ \ |
| ({ register unsigned int __v, __x = (x); \ |
| if (__builtin_constant_p (x)) \ |
| __v = __bswap_constant_32 (__x); \ |
| else \ |
| __asm__ __volatile__ ("shl %0 = %1, 32 ;;" \ |
| "mux1 %0 = %0, @rev ;;" \ |
| : "=r" (__v) \ |
| : "r" ((unsigned int) (__x))); \ |
| __v; })) |
| #else |
| static __inline unsigned int |
| __bswap_32 (unsigned int __bsx) |
| { |
| return __bswap_constant_32 (__bsx); |
| } |
| #endif |
| |
| |
| /* Swap bytes in 64 bit value. */ |
| #define __bswap_constant_64(x) \ |
| ((((x) & 0xff00000000000000ul) >> 56) \ |
| | (((x) & 0x00ff000000000000ul) >> 40) \ |
| | (((x) & 0x0000ff0000000000ul) >> 24) \ |
| | (((x) & 0x000000ff00000000ul) >> 8) \ |
| | (((x) & 0x00000000ff000000ul) << 8) \ |
| | (((x) & 0x0000000000ff0000ul) << 24) \ |
| | (((x) & 0x000000000000ff00ul) << 40) \ |
| | (((x) & 0x00000000000000fful) << 56)) |
| |
| #if defined __GNUC__ && __GNUC__ >= 2 |
| # define __bswap_64(x) \ |
| (__extension__ \ |
| ({ register unsigned long int __v, __x = (x); \ |
| if (__builtin_constant_p (x)) \ |
| __v = __bswap_constant_64 (__x); \ |
| else \ |
| __asm__ __volatile__ ("mux1 %0 = %1, @rev ;;" \ |
| : "=r" (__v) \ |
| : "r" ((unsigned long int) (__x))); \ |
| __v; })) |
| |
| #else |
| static __inline unsigned long int |
| __bswap_64 (unsigned long int __bsx) |
| { |
| return __bswap_constant_64 (__bsx); |
| } |
| #endif |
| |
| #endif /* _BITS_BYTESWAP_H */ |