release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/sysroot/usr/include/bits/byteswap-common.h

   1 /* Macros to swap the order of bytes in integer values.
   2    Copyright (C) 1997,1998,2000,2001,2002,2005 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #if !defined _BYTESWAP_H && !defined _NETINET_IN_H
  21 # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
  22 #endif
  23
  24 #ifndef _BITS_BYTESWAP_H
  25 #define _BITS_BYTESWAP_H 1
  26
  27 /* Swap bytes in 16 bit value.  */
  28 #define __bswap_constant_16(x) \
  29      ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
  30
  31 #ifndef __bswap_non_constant_16
  32 # define __bswap_non_constant_16(x) __bswap_constant_16(x)
  33 #endif
  34 #ifdef __GNUC__
  35 # define __bswap_16(x) \
  36     (__extension__                                                            \
  37      ({ unsigned short int __bsv, __bsx = (x);                                \
  38         if (__builtin_constant_p (__bsx))                                     \
  39           __bsv = __bswap_constant_16 (__bsx);                                \
  40         else                                                                  \
  41           __bsv = __bswap_non_constant_16 (__bsx);                            \
  42         __bsv; }))
  43 #else
  44 static __inline unsigned short int
  45 __bswap_16 (unsigned short int __bsx)
  46 {
  47   return __bswap_constant_16 (__bsx);
  48 }
  49 #endif
  50
  51 /* Swap bytes in 32 bit value.  */
  52 #define __bswap_constant_32(x) \
  53      ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >>  8) |             \
  54       (((x) & 0x0000ff00u) <<  8) | (((x) & 0x000000ffu) << 24))
  55
  56 #ifndef __bswap_non_constant_32
  57 # define __bswap_non_constant_32(x) __bswap_constant_32(x)
  58 #endif
  59 #ifdef __GNUC__
  60 # define __bswap_32(x) \
  61     (__extension__                                                            \
  62      ({ unsigned int __bsv, __bsx = (x);                                      \
  63         if (__builtin_constant_p (__bsx))                                     \
  64           __bsv = __bswap_constant_32 (__bsx);                                \
  65         else                                                                  \
  66           __bsv = __bswap_non_constant_32 (__bsx);                            \
  67         __bsv; }))
  68 #else
  69 static __inline unsigned int
  70 __bswap_32 (unsigned int __bsx)
  71 {
  72   return __bswap_constant_32 (__bsx);
  73 }
  74 #endif
  75
  76 #if defined __GNUC__ && __GNUC__ >= 2
  77 /* Swap bytes in 64 bit value.  */
  78 # define __bswap_constant_64(x) \
  79      ((((x) & 0xff00000000000000ull) >> 56)                                   \
  80       | (((x) & 0x00ff000000000000ull) >> 40)                                 \
  81       | (((x) & 0x0000ff0000000000ull) >> 24)                                 \
  82       | (((x) & 0x000000ff00000000ull) >> 8)                                  \
  83       | (((x) & 0x00000000ff000000ull) << 8)                                  \
  84       | (((x) & 0x0000000000ff0000ull) << 24)                                 \
  85       | (((x) & 0x000000000000ff00ull) << 40)                                 \
  86       | (((x) & 0x00000000000000ffull) << 56))
  87
  88 # ifndef __bswap_non_constant_64
  89 #  define __bswap_non_constant_64(x) \
  90      (__extension__                                                           \
  91       ({ union { __extension__ unsigned long long int __ll;                   \
  92                  unsigned int __l[2]; } __w, __r;                             \
  93          __w.__ll = (x);                                                      \
  94          __r.__l[0] = __bswap_non_constant_32 (__w.__l[1]);                   \
  95          __r.__l[1] = __bswap_non_constant_32 (__w.__l[0]);                   \
  96          __r.__ll; }))
  97 # endif
  98 # define __bswap_64(x) \
  99      (__extension__                                                           \
 100       ({ __extension__ unsigned long long int __ll;                           \
 101          if (__builtin_constant_p (x))                                        \
 102            __ll = __bswap_constant_64 (x);                                    \
 103          else                                                                 \
 104            __ll = __bswap_non_constant_64 (x);                                \
 105          __ll; }))
 106 #endif
 107
 108 #endif /* _BITS_BYTESWAP_H */