1 /*
2 * Copyright (c) 2003, 2007-14 Matteo Frigo
3 * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20
21 /* common routines for Cooley-Tukey algorithms */
22
23 #include "kernel/ifftw.h"
24
25 #define POW2P(n) (((n) > 0) && (((n) & ((n) - 1)) == 0))
26
27 /* TRUE if radix-r is ugly for size n */
X(ct_uglyp)28 int X(ct_uglyp)(INT min_n, INT v, INT n, INT r)
29 {
30 return (n <= min_n) || (POW2P(n) && (v * (n / r)) <= 4);
31 }
32