1 files changed, 73 insertions, 0 deletions
diff --git a/src/fftw3/kernel/tensor4.c b/src/fftw3/kernel/tensor4.c
new file mode 100644
index 0000000..9b6cd28
--- /dev/null
+++ b/src/fftw3/kernel/tensor4.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2003 Matteo Frigo
+ * Copyright (c) 2003 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/* $Id: tensor4.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
+
+#include "ifftw.h"
+
+int X(tensor_max_index)(const tensor *sz)
+{
+     int i;
+     int n = 0;
+
+     A(FINITE_RNK(sz->rnk));
+     for (i = 0; i < sz->rnk; ++i) {
+          const iodim *p = sz->dims + i;
+          n += (p->n - 1) * X(imax)(X(iabs)(p->is), X(iabs)(p->os));
+     }
+     return n;
+}
+
+#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));
+}