/*

 * 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 1D copy routine */

#include "kernel/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;

     }

}