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111
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1 /* Helper function for repacking arrays.
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2 Copyright (C) 2003-2017 Free Software Foundation, Inc.
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3 Contributed by Paul Brook <paul@nowt.org>
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4
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5 This file is part of the GNU Fortran runtime library (libgfortran).
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6
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7 Libgfortran is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU General Public
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9 License as published by the Free Software Foundation; either
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10 version 3 of the License, or (at your option) any later version.
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11
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12 Libgfortran is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "libgfortran.h"
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27 #include <string.h>
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28
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29
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30 #if defined (HAVE_GFC_REAL_4)
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31
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32 void
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33 internal_unpack_r4 (gfc_array_r4 * d, const GFC_REAL_4 * src)
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34 {
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35 index_type count[GFC_MAX_DIMENSIONS];
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36 index_type extent[GFC_MAX_DIMENSIONS];
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37 index_type stride[GFC_MAX_DIMENSIONS];
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38 index_type stride0;
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39 index_type dim;
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40 index_type dsize;
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41 GFC_REAL_4 * restrict dest;
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42 int n;
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43
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44 dest = d->base_addr;
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45 if (src == dest || !src)
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46 return;
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47
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48 dim = GFC_DESCRIPTOR_RANK (d);
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49 dsize = 1;
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50 for (n = 0; n < dim; n++)
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51 {
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52 count[n] = 0;
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53 stride[n] = GFC_DESCRIPTOR_STRIDE(d,n);
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54 extent[n] = GFC_DESCRIPTOR_EXTENT(d,n);
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55 if (extent[n] <= 0)
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56 return;
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57
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58 if (dsize == stride[n])
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59 dsize *= extent[n];
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60 else
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61 dsize = 0;
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62 }
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63
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64 if (dsize != 0)
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65 {
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66 memcpy (dest, src, dsize * sizeof (GFC_REAL_4));
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67 return;
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68 }
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69
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70 stride0 = stride[0];
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71
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72 while (dest)
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73 {
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74 /* Copy the data. */
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75 *dest = *(src++);
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76 /* Advance to the next element. */
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77 dest += stride0;
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78 count[0]++;
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79 /* Advance to the next source element. */
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80 n = 0;
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81 while (count[n] == extent[n])
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82 {
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83 /* When we get to the end of a dimension, reset it and increment
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84 the next dimension. */
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85 count[n] = 0;
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86 /* We could precalculate these products, but this is a less
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87 frequently used path so probably not worth it. */
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88 dest -= stride[n] * extent[n];
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89 n++;
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90 if (n == dim)
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91 {
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92 dest = NULL;
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93 break;
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94 }
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95 else
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96 {
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97 count[n]++;
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98 dest += stride[n];
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99 }
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100 }
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101 }
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102 }
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103
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104 #endif
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105
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