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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
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28
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29 #if defined (HAVE_GFC_INTEGER_2)
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30
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31 /* Allocates a block of memory with internal_malloc if the array needs
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32 repacking. */
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33
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34 GFC_INTEGER_2 *
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35 internal_pack_2 (gfc_array_i2 * source)
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36 {
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37 index_type count[GFC_MAX_DIMENSIONS];
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38 index_type extent[GFC_MAX_DIMENSIONS];
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39 index_type stride[GFC_MAX_DIMENSIONS];
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40 index_type stride0;
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41 index_type dim;
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42 index_type ssize;
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43 const GFC_INTEGER_2 *src;
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44 GFC_INTEGER_2 * restrict dest;
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45 GFC_INTEGER_2 *destptr;
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46 int n;
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47 int packed;
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48
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49 /* TODO: Investigate how we can figure out if this is a temporary
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50 since the stride=0 thing has been removed from the frontend. */
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51
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52 dim = GFC_DESCRIPTOR_RANK (source);
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53 ssize = 1;
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54 packed = 1;
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55 for (n = 0; n < dim; n++)
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56 {
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57 count[n] = 0;
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58 stride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
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59 extent[n] = GFC_DESCRIPTOR_EXTENT(source,n);
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60 if (extent[n] <= 0)
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61 {
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62 /* Do nothing. */
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63 packed = 1;
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64 break;
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65 }
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66
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67 if (ssize != stride[n])
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68 packed = 0;
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69
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70 ssize *= extent[n];
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71 }
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72
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73 if (packed)
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74 return source->base_addr;
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75
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76 /* Allocate storage for the destination. */
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77 destptr = xmallocarray (ssize, sizeof (GFC_INTEGER_2));
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78 dest = destptr;
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79 src = source->base_addr;
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80 stride0 = stride[0];
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81
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82
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83 while (src)
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84 {
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85 /* Copy the data. */
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86 *(dest++) = *src;
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87 /* Advance to the next element. */
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88 src += stride0;
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89 count[0]++;
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90 /* Advance to the next source element. */
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91 n = 0;
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92 while (count[n] == extent[n])
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93 {
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94 /* When we get to the end of a dimension, reset it and increment
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95 the next dimension. */
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96 count[n] = 0;
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97 /* We could precalculate these products, but this is a less
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98 frequently used path so probably not worth it. */
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99 src -= stride[n] * extent[n];
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100 n++;
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101 if (n == dim)
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102 {
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103 src = NULL;
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104 break;
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105 }
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106 else
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107 {
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108 count[n]++;
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109 src += stride[n];
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110 }
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111 }
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112 }
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113 return destptr;
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114 }
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115
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116 #endif
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117
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