mirror of
https://github.com/tildearrow/furnace.git
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70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/* out of place 1D copy routine */
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#include "kernel/ifftw.h"
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void X(cpy1d)(R *I, R *O, INT n0, INT is0, INT os0, INT vl)
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{
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INT i0, v;
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A(I != O);
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switch (vl) {
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case 1:
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if ((n0 & 1) || is0 != 1 || os0 != 1) {
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for (; n0 > 0; --n0, I += is0, O += os0)
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*O = *I;
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break;
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}
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n0 /= 2; is0 = 2; os0 = 2;
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/* fall through */
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case 2:
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if ((n0 & 1) || is0 != 2 || os0 != 2) {
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for (; n0 > 0; --n0, I += is0, O += os0) {
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R x0 = I[0];
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R x1 = I[1];
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O[0] = x0;
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O[1] = x1;
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}
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break;
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}
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n0 /= 2; is0 = 4; os0 = 4;
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/* fall through */
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case 4:
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for (; n0 > 0; --n0, I += is0, O += os0) {
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R x0 = I[0];
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R x1 = I[1];
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R x2 = I[2];
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R x3 = I[3];
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O[0] = x0;
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O[1] = x1;
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O[2] = x2;
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O[3] = x3;
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}
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break;
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default:
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for (i0 = 0; i0 < n0; ++i0)
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for (v = 0; v < vl; ++v) {
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R x0 = I[i0 * is0 + v];
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O[i0 * os0 + v] = x0;
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}
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break;
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}
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}
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