mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-27 06:53:01 +00:00
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
|
|
* 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;
|
|
}
|
|
}
|