sysdeps/tile/bits/byteswap.h

   1 /* Copyright (C) 2011 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   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 /* gcc __builtin_bswap64() can constant-fold, etc, so always use it. */
  27 #define __bswap_16(x) ((unsigned short)(__builtin_bswap32(x) >> 16))
  28 #define __bswap_32(x) ((unsigned int)__builtin_bswap32(x))
  29 #define __bswap_64(x) ((unsigned long long)__builtin_bswap64(x))
  30
  31 #define __bswap_constant_16(x) __bswap_16(x)
  32 #define __bswap_constant_32(x) __bswap_32(x)
  33 #define __bswap_constant_64(x) __bswap_64(x)
  34
  35 #endif /* _BITS_BYTESWAP_H */