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82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "kernel/ifftw.h"
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/* Given a solver which_dim, a vector sz, and whether or not the
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transform is out-of-place, return the actual dimension index that
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it corresponds to. The basic idea here is that we return the
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which_dim'th valid dimension, starting from the end if
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which_dim < 0. */
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static int really_pickdim(int which_dim, const tensor *sz, int oop, int *dp)
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{
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int i;
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int count_ok = 0;
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if (which_dim > 0) {
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for (i = 0; i < sz->rnk; ++i) {
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if (oop || sz->dims[i].is == sz->dims[i].os)
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if (++count_ok == which_dim) {
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*dp = i;
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return 1;
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}
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}
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}
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else if (which_dim < 0) {
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for (i = sz->rnk - 1; i >= 0; --i) {
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if (oop || sz->dims[i].is == sz->dims[i].os)
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if (++count_ok == -which_dim) {
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*dp = i;
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return 1;
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}
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}
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}
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else { /* zero: pick the middle, if valid */
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i = (sz->rnk - 1) / 2;
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if (i >= 0 && (oop || sz->dims[i].is == sz->dims[i].os)) {
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*dp = i;
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return 1;
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}
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}
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return 0;
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}
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/* Like really_pickdim, but only returns 1 if no previous "buddy"
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which_dim in the buddies list would give the same dim. */
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int X(pickdim)(int which_dim, const int *buddies, size_t nbuddies,
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const tensor *sz, int oop, int *dp)
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{
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size_t i;
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int d1;
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if (!really_pickdim(which_dim, sz, oop, dp))
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return 0;
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/* check whether some buddy solver would produce the same dim.
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If so, consider this solver unapplicable and let the buddy
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take care of it. The smallest-indexed buddy is applicable. */
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for (i = 0; i < nbuddies; ++i) {
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if (buddies[i] == which_dim)
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break; /* found self */
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if (really_pickdim(buddies[i], sz, oop, &d1) && *dp == d1)
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return 0; /* found equivalent buddy */
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}
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return 1;
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}
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