view Lib/fftw-3.2.1/kernel/tensor4.c @ 1:e86e9c111b29

Updates stuff that potentially fixes the memory leak and also makes it work on Windows and Linux (Need to test). Still have to fix fftw include for linux in Jucer.

/*
 * Copyright (c) 2003, 2007-8 Matteo Frigo
 * Copyright (c) 2003, 2007-8 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
 *
 */


#include "ifftw.h"

INT X(tensor_max_index)(const tensor *sz)
{
     int i;
     INT ni = 0, no = 0;

     A(FINITE_RNK(sz->rnk));
     for (i = 0; i < sz->rnk; ++i) {
          const iodim *p = sz->dims + i;
          ni += (p->n - 1) * X(iabs)(p->is);
          no += (p->n - 1) * X(iabs)(p->os);
     }
     return X(imax)(ni, no);
}

#define tensor_min_xstride(sz, xs) {			\
     A(FINITE_RNK(sz->rnk));				\
     if (sz->rnk == 0) return 0;			\
     else {						\
          int i;					\
          INT s = X(iabs)(sz->dims[0].xs);		\
          for (i = 1; i < sz->rnk; ++i)			\
               s = X(imin)(s, X(iabs)(sz->dims[i].xs));	\
          return s;					\
     }							\
}

INT X(tensor_min_istride)(const tensor *sz) tensor_min_xstride(sz, is)
INT X(tensor_min_ostride)(const tensor *sz) tensor_min_xstride(sz, os)

INT X(tensor_min_stride)(const tensor *sz)
{
     return X(imin)(X(tensor_min_istride)(sz), X(tensor_min_ostride)(sz));
}

int X(tensor_inplace_strides)(const tensor *sz)
{
     int i;
     A(FINITE_RNK(sz->rnk));
     for (i = 0; i < sz->rnk; ++i) {
          const iodim *p = sz->dims + i;
          if (p->is != p->os)
               return 0;
     }
     return 1;
}

int X(tensor_inplace_strides2)(const tensor *a, const tensor *b)
{
     return X(tensor_inplace_strides(a)) && X(tensor_inplace_strides(b));
}

/* return true (1) iff *any* strides of sz decrease when we
   tensor_inplace_copy(sz, k). */
static int tensor_strides_decrease(const tensor *sz, inplace_kind k)
{
     if (FINITE_RNK(sz->rnk)) {
          int i;
          for (i = 0; i < sz->rnk; ++i)
               if ((sz->dims[i].os - sz->dims[i].is)
                   * (k == INPLACE_OS ? (INT)1 : (INT)-1) < 0)
                    return 1;
     }
     return 0;
}

/* Return true (1) iff *any* strides of sz decrease when we
   tensor_inplace_copy(k) *or* if *all* strides of sz are unchanged
   but *any* strides of vecsz decrease.  This is used in indirect.c
   to determine whether to use INPLACE_IS or INPLACE_OS.

   Note: X(tensor_strides_decrease)(sz, vecsz, INPLACE_IS)
         || X(tensor_strides_decrease)(sz, vecsz, INPLACE_OS)
         || X(tensor_inplace_strides2)(p->sz, p->vecsz)
   must always be true. */
int X(tensor_strides_decrease)(const tensor *sz, const tensor *vecsz,
			       inplace_kind k)
{
     return(tensor_strides_decrease(sz, k)
	    || (X(tensor_inplace_strides)(sz)
		&& tensor_strides_decrease(vecsz, k)));
}