diff src/fftw-3.3.8/kernel/tile2d.c @ 82:d0c2a83c1364

Add FFTW 3.3.8 source, and a Linux build

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fftw-3.3.8/kernel/tile2d.c	Tue Nov 19 14:52:55 2019 +0000
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2003, 2007-14 Matteo Frigo
+ * Copyright (c) 2003, 2007-14 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
+ *
+ */
+
+/* out of place 2D copy routines */
+#include "kernel/ifftw.h"
+
+void X(tile2d)(INT n0l, INT n0u, INT n1l, INT n1u, INT tilesz,
+	       void (*f)(INT n0l, INT n0u, INT n1l, INT n1u, void *args),
+	       void *args)
+{
+     INT d0, d1;
+
+     A(tilesz > 0); /* infinite loops otherwise */
+     
+ tail:
+     d0 = n0u - n0l;
+     d1 = n1u - n1l;
+
+     if (d0 >= d1 && d0 > tilesz) {
+	  INT n0m = (n0u + n0l) / 2;
+	  X(tile2d)(n0l, n0m, n1l, n1u, tilesz, f, args);
+	  n0l = n0m; goto tail;
+     } else if (/* d1 >= d0 && */ d1 > tilesz) {
+	  INT n1m = (n1u + n1l) / 2;
+	  X(tile2d)(n0l, n0u, n1l, n1m, tilesz, f, args);
+	  n1l = n1m; goto tail;
+     } else {
+	  f(n0l, n0u, n1l, n1u, args);
+     }
+}
+
+INT X(compute_tilesz)(INT vl, int how_many_tiles_in_cache)
+{
+     return X(isqrt)(CACHESIZE / 
+		     (((INT)sizeof(R)) * vl * (INT)how_many_tiles_in_cache));
+}