comparison src/fftw-3.3.3/rdft/rdft2-strides.c @ 95:89f5e221ed7b

Add FFTW3

+/*
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include "rdft.h"
+
+/* Deal with annoyance because the tensor (is,os) applies to
+   (r,rio/iio) for R2HC and vice-versa for HC2R.  We originally had
+   (is,os) always apply to (r,rio/iio), but this causes other
+   headaches with the tensor functions. */
+void X(rdft2_strides)(rdft_kind kind, const iodim *d, INT *rs, INT *cs)
+{
+     if (kind == R2HC) {
+	  *rs = d->is;
+	  *cs = d->os;
+     }
+     else {
+	  A(kind == HC2R);
+	  *rs = d->os;
+	  *cs = d->is;
+     }
+}