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cpy1d.c

/*
 * Copyright (c) 2003, 2006 Matteo Frigo
 * Copyright (c) 2003, 2006 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
 *
 */

/* 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;
     }
}

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