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align.c

/*
 * Copyright (c) 2003, 2006 Matteo Frigo
 * Copyright (c) 2003, 2006 Massachusetts Institute of Technology
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/* $Id: align.c,v 1.29 2006-01-15 20:12:08 athena Exp $ */

#include "ifftw.h"

#if HAVE_SIMD
#  define ALGN 16
#elif HAVE_K7
#  define ALGN 8
#else
   /* disable the alignment machinery, because it will break,
      e.g., if sizeof(R) == 12 (as in long-double/x86) */
#  define ALGN 0
#endif

/* NONPORTABLE */
int X(alignment_of)(R *p)
{
     if (ALGN > 0)
        return (int)(((uintptr_t) p) % ALGN);
     else
        return 0;
}

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