comparison src/fftw-3.3.3/kernel/tensor4.c @ 10:37bf6b4a2645

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 "ifftw.h"
+
+INT X(tensor_max_index)(const tensor *sz)
+{
+     int i;
+     INT ni = 0, no = 0;
+
+     A(FINITE_RNK(sz->rnk));
+     for (i = 0; i < sz->rnk; ++i) {
+          const iodim *p = sz->dims + i;
+          ni += (p->n - 1) * X(iabs)(p->is);
+          no += (p->n - 1) * X(iabs)(p->os);
+     }
+     return X(imax)(ni, no);
+}
+
+#define tensor_min_xstride(sz, xs) {			\
+     A(FINITE_RNK(sz->rnk));				\
+     if (sz->rnk == 0) return 0;			\
+     else {						\
+          int i;					\
+          INT s = X(iabs)(sz->dims[0].xs);		\
+          for (i = 1; i < sz->rnk; ++i)			\
+               s = X(imin)(s, X(iabs)(sz->dims[i].xs));	\
+          return s;					\
+     }							\
+}
+
+INT X(tensor_min_istride)(const tensor *sz) tensor_min_xstride(sz, is)
+INT X(tensor_min_ostride)(const tensor *sz) tensor_min_xstride(sz, os)
+
+INT X(tensor_min_stride)(const tensor *sz)
+{
+     return X(imin)(X(tensor_min_istride)(sz), X(tensor_min_ostride)(sz));
+}
+
+int X(tensor_inplace_strides)(const tensor *sz)
+{
+     int i;
+     A(FINITE_RNK(sz->rnk));
+     for (i = 0; i < sz->rnk; ++i) {
+          const iodim *p = sz->dims + i;
+          if (p->is != p->os)
+               return 0;
+     }
+     return 1;
+}
+
+int X(tensor_inplace_strides2)(const tensor *a, const tensor *b)
+{
+     return X(tensor_inplace_strides(a)) && X(tensor_inplace_strides(b));
+}
+
+/* return true (1) iff *any* strides of sz decrease when we
+   tensor_inplace_copy(sz, k). */
+static int tensor_strides_decrease(const tensor *sz, inplace_kind k)
+{
+     if (FINITE_RNK(sz->rnk)) {
+          int i;
+          for (i = 0; i < sz->rnk; ++i)
+               if ((sz->dims[i].os - sz->dims[i].is)
+                   * (k == INPLACE_OS ? (INT)1 : (INT)-1) < 0)
+                    return 1;
+     }
+     return 0;
+}
+
+/* Return true (1) iff *any* strides of sz decrease when we
+   tensor_inplace_copy(k) *or* if *all* strides of sz are unchanged
+   but *any* strides of vecsz decrease.  This is used in indirect.c
+   to determine whether to use INPLACE_IS or INPLACE_OS.
+
+   Note: X(tensor_strides_decrease)(sz, vecsz, INPLACE_IS)
+         || X(tensor_strides_decrease)(sz, vecsz, INPLACE_OS)
+         || X(tensor_inplace_strides2)(p->sz, p->vecsz)
+   must always be true. */
+int X(tensor_strides_decrease)(const tensor *sz, const tensor *vecsz,
+			       inplace_kind k)
+{
+     return(tensor_strides_decrease(sz, k)
+	    || (X(tensor_inplace_strides)(sz)
+		&& tensor_strides_decrease(vecsz, k)));
+}