sysdeps/s390/bits/byteswap.h

   1 /* Macros to swap the order of bytes in integer values.  s390 version.
   2    Copyright (C) 2000-2015 Free Software Foundation, Inc.
   3    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
  21 # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
  22 #endif
  23
  24 #include <bits/wordsize.h>
  25
  26 #ifndef _BITS_BYTESWAP_H
  27 #define _BITS_BYTESWAP_H 1
  28
  29 #define __bswap_constant_16(x) \
  30         ((unsigned short int) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
  31
  32 /* Get __bswap_16.  */
  33 #include <bits/byteswap-16.h>
  34
  35 /* Swap bytes in 32 bit value.  */
  36 #define __bswap_constant_32(x) \
  37      ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) |               \
  38       (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
  39
  40 #if defined __GNUC__ && __GNUC__ >= 2
  41 # if __WORDSIZE == 64
  42 #  define __bswap_32(x) \
  43      (__extension__                                                           \
  44       ({ unsigned int __v, __x = (x);                                         \
  45          if (__builtin_constant_p (x))                                        \
  46            __v = __bswap_constant_32 (__x);                                   \
  47          else {                                                               \
  48            unsigned int __tmp = (unsigned int) (__x);                         \
  49            __asm__ __volatile__ (                                             \
  50               "lrv   %0,%1"                                                   \
  51               : "=&d" (__v) : "m" (__tmp));                                   \
  52          }                                                                    \
  53          __v; }))
  54 # else
  55 #  define __bswap_32(x) \
  56      (__extension__                                                           \
  57       ({ unsigned int __v, __x = (x);                                         \
  58          if (__builtin_constant_p (x))                                        \
  59            __v = __bswap_constant_32 (__x);                                   \
  60          else {                                                               \
  61            unsigned int __tmp = (unsigned int) (__x);                         \
  62            __asm__ __volatile__ (                                             \
  63               "la    1,%1\n"                                                  \
  64               "icm   %0,8,3(1)\n"                                             \
  65               "icm   %0,4,2(1)\n"                                             \
  66               "icm   %0,2,1(1)\n"                                             \
  67               "ic    %0,0(1)"                                                 \
  68               : "=&d" (__v) : "m" (__tmp) : "1");                             \
  69          }                                                                    \
  70          __v; }))
  71 # endif
  72 #else
  73 static __inline unsigned int
  74 __bswap_32 (unsigned int __bsx)
  75 {
  76   return __bswap_constant_32 (__bsx);
  77 }
  78 #endif
  79
  80 /* Swap bytes in 64 bit value.  */
  81 #if defined __GNUC__ && __GNUC__ >= 2
  82 # define __bswap_constant_64(x) \
  83      (__extension__ ((((x) & 0xff00000000000000ul) >> 56)                     \
  84                      | (((x) & 0x00ff000000000000ul) >>  40)                  \
  85                      | (((x) & 0x0000ff0000000000ul) >> 24)                   \
  86                      | (((x) & 0x000000ff00000000ul) >> 8)                    \
  87                      | (((x) & 0x00000000ff000000ul) << 8)                    \
  88                      | (((x) & 0x0000000000ff0000ul) << 24)                   \
  89                      | (((x) & 0x000000000000ff00ul) << 40)                   \
  90                      | (((x) & 0x00000000000000fful) << 56)))
  91
  92 # if __WORDSIZE == 64
  93 #  define __bswap_64(x) \
  94      (__extension__                                                           \
  95       ({ unsigned long __w, __x = (x);                                        \
  96          if (__builtin_constant_p (x))                                        \
  97            __w = __bswap_constant_64 (__x);                                   \
  98          else {                                                               \
  99            unsigned long __tmp = (unsigned long) (__x);                       \
 100            __asm__ __volatile__ (                                             \
 101               "lrvg  %0,%1"                                                   \
 102               : "=&d" (__w) : "m" (__tmp));                                   \
 103          }                                                                    \
 104          __w; }))
 105 # else
 106 #  define __bswap_64(x) \
 107      __extension__                                      \
 108        ({ union { unsigned long long int __ll;          \
 109                   unsigned long int __l[2]; } __w, __r; \
 110           __w.__ll = (x);                               \
 111           __r.__l[0] = __bswap_32 (__w.__l[1]);         \
 112           __r.__l[1] = __bswap_32 (__w.__l[0]);         \
 113           __r.__ll; })
 114 # endif
 115 #else
 116 # define __bswap_constant_64(x) \
 117      ((((x) & 0xff00000000000000ull) >> 56)                                   \
 118       | (((x) & 0x00ff000000000000ull) >> 40)                                 \
 119       | (((x) & 0x0000ff0000000000ull) >> 24)                                 \
 120       | (((x) & 0x000000ff00000000ull) >> 8)                                  \
 121       | (((x) & 0x00000000ff000000ull) << 8)                                  \
 122       | (((x) & 0x0000000000ff0000ull) << 24)                                 \
 123       | (((x) & 0x000000000000ff00ull) << 40)                                 \
 124       | (((x) & 0x00000000000000ffull) << 56))
 125
 126 __extension__
 127 static __inline unsigned long long int
 128 __bswap_64 (unsigned long long int __bsx)
 129 {
 130   return __bswap_constant_64 (__bsx);
 131 }
 132 #endif
 133
 134 #endif /* _BITS_BYTESWAP_H */