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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 #include "ifftw-mpi.h"
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22
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23 /* common functions for rearrangements of the data for the *-rank1-bigvec
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24 solvers */
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25
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26 static int div_mult(INT b, INT a) {
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27 return (a > b && a % b == 0);
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28 }
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29 static int div_mult2(INT b, INT a, INT n) {
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30 return (div_mult(b, a) && div_mult(n, b));
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31 }
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32
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33 int XM(rearrange_applicable)(rearrangement rearrange,
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34 ddim dim0, INT vn, int n_pes)
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35 {
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36 /* note: it is important that cases other than CONTIG be
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37 applicable only when the resulting transpose dimension
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38 is divisible by n_pes; otherwise, the allocation size
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39 returned by the API will be incorrect */
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40 return ((rearrange != DISCONTIG || div_mult(n_pes, vn))
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41 && (rearrange != SQUARE_BEFORE
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42 || div_mult2(dim0.b[IB], vn, n_pes))
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43 && (rearrange != SQUARE_AFTER
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44 || (dim0.b[IB] != dim0.b[OB]
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45 && div_mult2(dim0.b[OB], vn, n_pes)))
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46 && (rearrange != SQUARE_MIDDLE
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47 || div_mult(dim0.n * n_pes, vn)));
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48 }
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49
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50 INT XM(rearrange_ny)(rearrangement rearrange, ddim dim0, INT vn, int n_pes)
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51 {
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52 switch (rearrange) {
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53 case CONTIG:
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54 return vn;
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55 case DISCONTIG:
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56 return n_pes;
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57 case SQUARE_BEFORE:
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58 return dim0.b[IB];
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59 case SQUARE_AFTER:
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60 return dim0.b[OB];
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61 case SQUARE_MIDDLE:
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62 return dim0.n * n_pes;
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63 }
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64 return 0;
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65 }
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