|
Chris@42
|
1 /*
|
|
Chris@42
|
2 * Copyright (c) 2003, 2007-14 Matteo Frigo
|
|
Chris@42
|
3 * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
|
|
Chris@42
|
4 *
|
|
Chris@42
|
5 * This program is free software; you can redistribute it and/or modify
|
|
Chris@42
|
6 * it under the terms of the GNU General Public License as published by
|
|
Chris@42
|
7 * the Free Software Foundation; either version 2 of the License, or
|
|
Chris@42
|
8 * (at your option) any later version.
|
|
Chris@42
|
9 *
|
|
Chris@42
|
10 * This program is distributed in the hope that it will be useful,
|
|
Chris@42
|
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Chris@42
|
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
Chris@42
|
13 * GNU General Public License for more details.
|
|
Chris@42
|
14 *
|
|
Chris@42
|
15 * You should have received a copy of the GNU General Public License
|
|
Chris@42
|
16 * along with this program; if not, write to the Free Software
|
|
Chris@42
|
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
Chris@42
|
18 *
|
|
Chris@42
|
19 */
|
|
Chris@42
|
20
|
|
Chris@42
|
21 #include "ifftw.h"
|
|
Chris@42
|
22
|
|
Chris@42
|
23
|
|
Chris@42
|
24 /* Given a solver which_dim, a vector sz, and whether or not the
|
|
Chris@42
|
25 transform is out-of-place, return the actual dimension index that
|
|
Chris@42
|
26 it corresponds to. The basic idea here is that we return the
|
|
Chris@42
|
27 which_dim'th valid dimension, starting from the end if
|
|
Chris@42
|
28 which_dim < 0. */
|
|
Chris@42
|
29 static int really_pickdim(int which_dim, const tensor *sz, int oop, int *dp)
|
|
Chris@42
|
30 {
|
|
Chris@42
|
31 int i;
|
|
Chris@42
|
32 int count_ok = 0;
|
|
Chris@42
|
33 if (which_dim > 0) {
|
|
Chris@42
|
34 for (i = 0; i < sz->rnk; ++i) {
|
|
Chris@42
|
35 if (oop || sz->dims[i].is == sz->dims[i].os)
|
|
Chris@42
|
36 if (++count_ok == which_dim) {
|
|
Chris@42
|
37 *dp = i;
|
|
Chris@42
|
38 return 1;
|
|
Chris@42
|
39 }
|
|
Chris@42
|
40 }
|
|
Chris@42
|
41 }
|
|
Chris@42
|
42 else if (which_dim < 0) {
|
|
Chris@42
|
43 for (i = sz->rnk - 1; i >= 0; --i) {
|
|
Chris@42
|
44 if (oop || sz->dims[i].is == sz->dims[i].os)
|
|
Chris@42
|
45 if (++count_ok == -which_dim) {
|
|
Chris@42
|
46 *dp = i;
|
|
Chris@42
|
47 return 1;
|
|
Chris@42
|
48 }
|
|
Chris@42
|
49 }
|
|
Chris@42
|
50 }
|
|
Chris@42
|
51 else { /* zero: pick the middle, if valid */
|
|
Chris@42
|
52 i = (sz->rnk - 1) / 2;
|
|
Chris@42
|
53 if (i >= 0 && (oop || sz->dims[i].is == sz->dims[i].os)) {
|
|
Chris@42
|
54 *dp = i;
|
|
Chris@42
|
55 return 1;
|
|
Chris@42
|
56 }
|
|
Chris@42
|
57 }
|
|
Chris@42
|
58 return 0;
|
|
Chris@42
|
59 }
|
|
Chris@42
|
60
|
|
Chris@42
|
61 /* Like really_pickdim, but only returns 1 if no previous "buddy"
|
|
Chris@42
|
62 which_dim in the buddies list would give the same dim. */
|
|
Chris@42
|
63 int X(pickdim)(int which_dim, const int *buddies, size_t nbuddies,
|
|
Chris@42
|
64 const tensor *sz, int oop, int *dp)
|
|
Chris@42
|
65 {
|
|
Chris@42
|
66 size_t i;
|
|
Chris@42
|
67 int d1;
|
|
Chris@42
|
68
|
|
Chris@42
|
69 if (!really_pickdim(which_dim, sz, oop, dp))
|
|
Chris@42
|
70 return 0;
|
|
Chris@42
|
71
|
|
Chris@42
|
72 /* check whether some buddy solver would produce the same dim.
|
|
Chris@42
|
73 If so, consider this solver unapplicable and let the buddy
|
|
Chris@42
|
74 take care of it. The smallest-indexed buddy is applicable. */
|
|
Chris@42
|
75 for (i = 0; i < nbuddies; ++i) {
|
|
Chris@42
|
76 if (buddies[i] == which_dim)
|
|
Chris@42
|
77 break; /* found self */
|
|
Chris@42
|
78 if (really_pickdim(buddies[i], sz, oop, &d1) && *dp == d1)
|
|
Chris@42
|
79 return 0; /* found equivalent buddy */
|
|
Chris@42
|
80 }
|
|
Chris@42
|
81 return 1;
|
|
Chris@42
|
82 }
|
