comparison src/fftw-3.3.3/kernel/cpy1d.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
+ *
+ */
+
+/* out of place 1D copy routine */
+#include "ifftw.h"
+
+void X(cpy1d)(R *I, R *O, INT n0, INT is0, INT os0, INT vl)
+{
+     INT i0, v;
+
+     A(I != O);
+     switch (vl) {
+	 case 1:
+	      if ((n0 & 1) || is0 != 1 || os0 != 1) {
+		   for (; n0 > 0; --n0, I += is0, O += os0)
+			*O = *I;
+		   break;
+	      }
+	      n0 /= 2; is0 = 2; os0 = 2;
+	      /* fall through */
+	 case 2:
+	      if ((n0 & 1) || is0 != 2 || os0 != 2) {
+		   for (; n0 > 0; --n0, I += is0, O += os0) {
+			R x0 = I[0];
+			R x1 = I[1];
+			O[0] = x0;
+			O[1] = x1;
+		   }
+		   break;
+	      }
+	      n0 /= 2; is0 = 4; os0 = 4;
+	      /* fall through */
+	 case 4:
+	      for (; n0 > 0; --n0, I += is0, O += os0) {
+		   R x0 = I[0];
+		   R x1 = I[1];
+		   R x2 = I[2];
+		   R x3 = I[3];
+		   O[0] = x0;
+		   O[1] = x1;
+		   O[2] = x2;
+		   O[3] = x3;
+	      }
+	      break;
+	 default:
+	      for (i0 = 0; i0 < n0; ++i0)
+		   for (v = 0; v < vl; ++v) {
+			R x0 = I[i0 * is0 + v];
+			O[i0 * os0 + v] = x0;
+		   }
+	      break;
+     }
+}