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/*
* Copyright (c) 2003 Matteo Frigo
* Copyright (c) 2003 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"
/* $Id: pickdim.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
/* Given a solver which_dim, a vector sz, and whether or not the
transform is out-of-place, return the actual dimension index that
it corresponds to. The basic idea here is that we return the
which_dim'th valid dimension, starting from the end if
which_dim < 0. */
static int really_pickdim(int which_dim, const tensor *sz, int oop, int *dp)
{
int i;
int count_ok = 0;
if (which_dim > 0) {
for (i = 0; i < sz->rnk; ++i) {
if (oop || sz->dims[i].is == sz->dims[i].os)
if (++count_ok == which_dim) {
*dp = i;
return 1;
}
}
}
else if (which_dim < 0) {
for (i = sz->rnk; i > 0; --i) {
if (oop || sz->dims[i - 1].is == sz->dims[i - 1].os)
if (++count_ok == -which_dim) {
*dp = i - 1;
return 1;
}
}
}
else { /* zero: pick the middle, if valid */
i = sz->rnk / 2 - 1;
if (i < sz->rnk && (oop || sz->dims[i].is == sz->dims[i].os)) {
*dp = i;
return 1;
}
}
return 0;
}
/* Like really_pickdim, but only returns 1 if no previous "buddy"
which_dim in the buddies list would give the same dim. */
int X(pickdim)(int which_dim, const int *buddies, int nbuddies,
const tensor *sz, int oop, int *dp)
{
int i, d1;
if (!really_pickdim(which_dim, sz, oop, dp))
return 0;
/* check whether some buddy solver would produce the same dim.
If so, consider this solver unapplicable and let the buddy
take care of it. The smallest-indexed buddy is applicable. */
for (i = 0; i < nbuddies; ++i) {
if (buddies[i] == which_dim)
break; /* found self */
if (really_pickdim(buddies[i], sz, oop, &d1) && *dp == d1)
return 0; /* found equivalent buddy */
}
return 1;
}
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