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1 /*
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2 * Copyright (c) 2003, 2007-11 Matteo Frigo
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3 * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
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4 *
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5 * This program is free software; you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation; either version 2 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program; if not, write to the Free Software
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17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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18 *
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19 */
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20
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21 /* out of place copy routines for pairs of isomorphic 2D arrays */
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22 #include "ifftw.h"
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23
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24 void X(cpy2d_pair)(R *I0, R *I1, R *O0, R *O1,
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25 INT n0, INT is0, INT os0,
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26 INT n1, INT is1, INT os1)
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27 {
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28 INT i0, i1;
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29
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30 for (i1 = 0; i1 < n1; ++i1)
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31 for (i0 = 0; i0 < n0; ++i0) {
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32 R x0 = I0[i0 * is0 + i1 * is1];
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33 R x1 = I1[i0 * is0 + i1 * is1];
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34 O0[i0 * os0 + i1 * os1] = x0;
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35 O1[i0 * os0 + i1 * os1] = x1;
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36 }
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37 }
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38
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39 /* like cpy2d_pair, but read input contiguously if possible */
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40 void X(cpy2d_pair_ci)(R *I0, R *I1, R *O0, R *O1,
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41 INT n0, INT is0, INT os0,
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42 INT n1, INT is1, INT os1)
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43 {
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44 if (IABS(is0) < IABS(is1)) /* inner loop is for n0 */
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45 X(cpy2d_pair) (I0, I1, O0, O1, n0, is0, os0, n1, is1, os1);
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46 else
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47 X(cpy2d_pair) (I0, I1, O0, O1, n1, is1, os1, n0, is0, os0);
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48 }
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49
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50 /* like cpy2d_pair, but write output contiguously if possible */
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51 void X(cpy2d_pair_co)(R *I0, R *I1, R *O0, R *O1,
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52 INT n0, INT is0, INT os0,
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53 INT n1, INT is1, INT os1)
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54 {
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55 if (IABS(os0) < IABS(os1)) /* inner loop is for n0 */
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56 X(cpy2d_pair) (I0, I1, O0, O1, n0, is0, os0, n1, is1, os1);
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57 else
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58 X(cpy2d_pair) (I0, I1, O0, O1, n1, is1, os1, n0, is0, os0);
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59 }
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