ports/sysdeps/ia64/bits/byteswap.h

   1 /* Macros to swap the order of bytes in integer values.
   2    Copyright (C) 1997-2014 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
  20 # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
  21 #endif
  22
  23 #ifndef _BITS_BYTESWAP_H
  24 #define _BITS_BYTESWAP_H 1
  25
  26 /* Swap bytes in 16 bit value.  */
  27 #define __bswap_constant_16(x) \
  28      ((unsigned short int)((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
  29
  30 /* Get __bswap_16.  */
  31 #include <bits/byteswap-16.h>
  32
  33 /* Swap bytes in 32 bit value.  */
  34 #define __bswap_constant_32(x) \
  35      ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) |               \
  36       (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
  37
  38 #if defined __GNUC__ && __GNUC__ >= 2
  39 # define __bswap_32(x) \
  40      (__extension__                                                           \
  41       ({ unsigned int __v, __x = (x);                                         \
  42          if (__builtin_constant_p (x))                                        \
  43            __v = __bswap_constant_32 (__x);                                   \
  44          else                                                                 \
  45            __asm__ __volatile__ ("shl %0 = %1, 32 ;;"                         \
  46                                  "mux1 %0 = %0, @rev ;;"                      \
  47                                  : "=r" (__v)                                 \
  48                                  : "r" ((unsigned int) (__x)));               \
  49          __v; }))
  50 #else
  51 static __inline unsigned int
  52 __bswap_32 (unsigned int __bsx)
  53 {
  54   return __bswap_constant_32 (__bsx);
  55 }
  56 #endif
  57
  58
  59 /* Swap bytes in 64 bit value.  */
  60 #if defined __GNUC__ && __GNUC__ >= 2
  61 # define __bswap_constant_64(x) \
  62      (__extension__ ((((x) & 0xff00000000000000ul) >> 56)                     \
  63                      | (((x) & 0x00ff000000000000ul) >>  40)                  \
  64                      | (((x) & 0x0000ff0000000000ul) >> 24)                   \
  65                      | (((x) & 0x000000ff00000000ul) >> 8)                    \
  66                      | (((x) & 0x00000000ff000000ul) << 8)                    \
  67                      | (((x) & 0x0000000000ff0000ul) << 24)                   \
  68                      | (((x) & 0x000000000000ff00ul) << 40)                   \
  69                      | (((x) & 0x00000000000000fful) << 56)))
  70
  71 # define __bswap_64(x) \
  72      (__extension__                                                           \
  73       ({ unsigned long int __v, __x = (x);                                    \
  74          if (__builtin_constant_p (x))                                        \
  75            __v = __bswap_constant_64 (__x);                                   \
  76          else                                                                 \
  77            __asm__ __volatile__ ("mux1 %0 = %1, @rev ;;"                      \
  78                                  : "=r" (__v)                                 \
  79                                  : "r" ((unsigned long int) (__x)));          \
  80          __v; }))
  81
  82 #else
  83 # define __bswap_constant_64(x) \
  84      ((((x) & 0xff00000000000000ul) >> 56)                                    \
  85       | (((x) & 0x00ff000000000000ul) >>  40)                                 \
  86       | (((x) & 0x0000ff0000000000ul) >> 24)                                  \
  87       | (((x) & 0x000000ff00000000ul) >> 8)                                   \
  88       | (((x) & 0x00000000ff000000ul) << 8)                                   \
  89       | (((x) & 0x0000000000ff0000ul) << 24)                                  \
  90       | (((x) & 0x000000000000ff00ul) << 40)                                  \
  91       | (((x) & 0x00000000000000fful) << 56))
  92
  93 static __inline unsigned long int
  94 __bswap_64 (unsigned long int __bsx)
  95 {
  96   return __bswap_constant_64 (__bsx);
  97 }
  98 #endif
  99
 100 #endif /* _BITS_BYTESWAP_H */