Chris@10: /*
Chris@10:  * Copyright (c) 2003, 2007-11 Matteo Frigo
Chris@10:  * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
Chris@10:  *
Chris@10:  * This program is free software; you can redistribute it and/or modify
Chris@10:  * it under the terms of the GNU General Public License as published by
Chris@10:  * the Free Software Foundation; either version 2 of the License, or
Chris@10:  * (at your option) any later version.
Chris@10:  *
Chris@10:  * This program is distributed in the hope that it will be useful,
Chris@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@10:  * GNU General Public License for more details.
Chris@10:  *
Chris@10:  * You should have received a copy of the GNU General Public License
Chris@10:  * along with this program; if not, write to the Free Software
Chris@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@10:  *
Chris@10:  */
Chris@10: 
Chris@10: /* out of place 1D copy routine */
Chris@10: #include "ifftw.h"
Chris@10: 
Chris@10: void X(cpy1d)(R *I, R *O, INT n0, INT is0, INT os0, INT vl)
Chris@10: {
Chris@10:      INT i0, v;
Chris@10: 
Chris@10:      A(I != O);
Chris@10:      switch (vl) {
Chris@10: 	 case 1:
Chris@10: 	      if ((n0 & 1) || is0 != 1 || os0 != 1) {
Chris@10: 		   for (; n0 > 0; --n0, I += is0, O += os0)
Chris@10: 			*O = *I;
Chris@10: 		   break;
Chris@10: 	      }
Chris@10: 	      n0 /= 2; is0 = 2; os0 = 2;
Chris@10: 	      /* fall through */
Chris@10: 	 case 2:
Chris@10: 	      if ((n0 & 1) || is0 != 2 || os0 != 2) {
Chris@10: 		   for (; n0 > 0; --n0, I += is0, O += os0) {
Chris@10: 			R x0 = I[0];
Chris@10: 			R x1 = I[1];
Chris@10: 			O[0] = x0;
Chris@10: 			O[1] = x1;
Chris@10: 		   }
Chris@10: 		   break;
Chris@10: 	      }
Chris@10: 	      n0 /= 2; is0 = 4; os0 = 4;
Chris@10: 	      /* fall through */
Chris@10: 	 case 4:
Chris@10: 	      for (; n0 > 0; --n0, I += is0, O += os0) {
Chris@10: 		   R x0 = I[0];
Chris@10: 		   R x1 = I[1];
Chris@10: 		   R x2 = I[2];
Chris@10: 		   R x3 = I[3];
Chris@10: 		   O[0] = x0;
Chris@10: 		   O[1] = x1;
Chris@10: 		   O[2] = x2;
Chris@10: 		   O[3] = x3;
Chris@10: 	      }
Chris@10: 	      break;
Chris@10: 	 default:
Chris@10: 	      for (i0 = 0; i0 < n0; ++i0)
Chris@10: 		   for (v = 0; v < vl; ++v) {
Chris@10: 			R x0 = I[i0 * is0 + v];
Chris@10: 			O[i0 * os0 + v] = x0;
Chris@10: 		   }
Chris@10: 	      break;
Chris@10:      }
Chris@10: }