First commit - moving from LuaForge to SourceForge

1 files changed, 44 insertions, 0 deletions

diff --git a/src/fftw3/kernel/kbuffered.c b/src/fftw3/kernel/kbuffered.c
new file mode 100644
index 0000000..d20403f
--- /dev/null
+++ b/src/fftw3/kernel/kbuffered.c
@@ -0,0 +1,44 @@
+/*
+ * 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
+ *
+ */
+
+/* routines shared by the various buffered solvers */
+
+#include "ifftw.h"
+
+int X(compute_nbuf)(int n, int vl, int nbuf, int maxbufsz)
+{
+     int i; 
+
+     if (nbuf * n > maxbufsz)
+          nbuf = X(imax)((int)1, maxbufsz / n);
+
+     /*
+      * Look for a buffer number (not too big) that divides the
+      * vector length, in order that we only need one child plan:
+      */
+     for (i = nbuf; i < vl && i < 2 * nbuf; ++i)
+          if (vl % i == 0)
+               return i;
+
+     /* whatever... */
+     nbuf = X(imin)(nbuf, vl);
+     return nbuf;
+}
+