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1 /*
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2 * Copyright (c) 2003, 2007-14 Matteo Frigo
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3 * Copyright (c) 2003, 2007-14 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 1D copy routine */
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22 #include "ifftw.h"
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23
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24 void X(cpy1d)(R *I, R *O, INT n0, INT is0, INT os0, INT vl)
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25 {
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26 INT i0, v;
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27
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28 A(I != O);
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29 switch (vl) {
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30 case 1:
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31 if ((n0 & 1) || is0 != 1 || os0 != 1) {
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32 for (; n0 > 0; --n0, I += is0, O += os0)
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33 *O = *I;
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34 break;
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35 }
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36 n0 /= 2; is0 = 2; os0 = 2;
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37 /* fall through */
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38 case 2:
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39 if ((n0 & 1) || is0 != 2 || os0 != 2) {
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40 for (; n0 > 0; --n0, I += is0, O += os0) {
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41 R x0 = I[0];
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42 R x1 = I[1];
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43 O[0] = x0;
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44 O[1] = x1;
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45 }
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46 break;
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47 }
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48 n0 /= 2; is0 = 4; os0 = 4;
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49 /* fall through */
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50 case 4:
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51 for (; n0 > 0; --n0, I += is0, O += os0) {
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52 R x0 = I[0];
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53 R x1 = I[1];
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54 R x2 = I[2];
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55 R x3 = I[3];
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56 O[0] = x0;
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57 O[1] = x1;
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58 O[2] = x2;
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59 O[3] = x3;
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60 }
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61 break;
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62 default:
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63 for (i0 = 0; i0 < n0; ++i0)
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64 for (v = 0; v < vl; ++v) {
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65 R x0 = I[i0 * is0 + v];
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66 O[i0 * os0 + v] = x0;
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67 }
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68 break;
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69 }
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70 }
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