libmpeg2/attributes.h

   1 /*
   2  * attributes.h
   3  * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
   4  * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
   5  *
   6  * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
   7  * See http://libmpeg2.sourceforge.net/ for updates.
   8  *
   9  * mpeg2dec is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * mpeg2dec is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 /* use gcc attribs to align critical data structures */
  25 #ifdef ATTRIBUTE_ALIGNED_MAX
  26 #define ATTR_ALIGN(align) __attribute__ ((__aligned__ ((ATTRIBUTE_ALIGNED_MAX < align) ? ATTRIBUTE_ALIGNED_MAX : align)))
  27 #else
  28 #define ATTR_ALIGN(align)
  29 #endif
  30
  31 #ifdef HAVE_BUILTIN_EXPECT
  32 #define likely(x) __builtin_expect ((x) != 0, 1)
  33 #define unlikely(x) __builtin_expect ((x) != 0, 0)
  34 #else
  35 #define likely(x) (x)
  36 #define unlikely(x) (x)
  37 #endif