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      1 /* Helper function for repacking arrays.
      2    Copyright (C) 2003-2024 Free Software Foundation, Inc.
      3    Contributed by Paul Brook <paul (at) nowt.org>
      4 
      5 This file is part of the GNU Fortran runtime library (libgfortran).
      6 
      7 Libgfortran is free software; you can redistribute it and/or
      8 modify it under the terms of the GNU General Public
      9 License as published by the Free Software Foundation; either
     10 version 3 of the License, or (at your option) any later version.
     11 
     12 Libgfortran is distributed in the hope that it will be useful,
     13 but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 GNU General Public License for more details.
     16 
     17 Under Section 7 of GPL version 3, you are granted additional
     18 permissions described in the GCC Runtime Library Exception, version
     19 3.1, as published by the Free Software Foundation.
     20 
     21 You should have received a copy of the GNU General Public License and
     22 a copy of the GCC Runtime Library Exception along with this program;
     23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     24 <http://www.gnu.org/licenses/>.  */
     25 
     26 #include "libgfortran.h"
     27 
     28 
     29 #if defined (HAVE_GFC_REAL_17)
     30 
     31 /* Allocates a block of memory with internal_malloc if the array needs
     32    repacking.  */
     33 
     34 GFC_REAL_17 *
     35 internal_pack_r17 (gfc_array_r17 * source)
     36 {
     37   index_type count[GFC_MAX_DIMENSIONS];
     38   index_type extent[GFC_MAX_DIMENSIONS];
     39   index_type stride[GFC_MAX_DIMENSIONS];
     40   index_type stride0;
     41   index_type dim;
     42   index_type ssize;
     43   const GFC_REAL_17 *src;
     44   GFC_REAL_17 * restrict dest;
     45   GFC_REAL_17 *destptr;
     46   int packed;
     47 
     48   /* TODO: Investigate how we can figure out if this is a temporary
     49      since the stride=0 thing has been removed from the frontend.  */
     50 
     51   dim = GFC_DESCRIPTOR_RANK (source);
     52   ssize = 1;
     53   packed = 1;
     54   for (index_type n = 0; n < dim; n++)
     55     {
     56       count[n] = 0;
     57       stride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
     58       extent[n] = GFC_DESCRIPTOR_EXTENT(source,n);
     59       if (extent[n] <= 0)
     60         {
     61           /* Do nothing.  */
     62           packed = 1;
     63           break;
     64         }
     65 
     66       if (ssize != stride[n])
     67         packed = 0;
     68 
     69       ssize *= extent[n];
     70     }
     71 
     72   if (packed)
     73     return source->base_addr;
     74 
     75   /* Allocate storage for the destination.  */
     76   destptr = xmallocarray (ssize, sizeof (GFC_REAL_17));
     77   dest = destptr;
     78   src = source->base_addr;
     79   stride0 = stride[0];
     80 
     81 
     82   while (src)
     83     {
     84       /* Copy the data.  */
     85       *(dest++) = *src;
     86       /* Advance to the next element.  */
     87       src += stride0;
     88       count[0]++;
     89       /* Advance to the next source element.  */
     90       index_type n = 0;
     91       while (count[n] == extent[n])
     92         {
     93           /* When we get to the end of a dimension, reset it and increment
     94              the next dimension.  */
     95           count[n] = 0;
     96           /* We could precalculate these products, but this is a less
     97              frequently used path so probably not worth it.  */
     98           src -= stride[n] * extent[n];
     99           n++;
    100           if (n == dim)
    101             {
    102               src = NULL;
    103               break;
    104             }
    105           else
    106             {
    107               count[n]++;
    108               src += stride[n];
    109             }
    110         }
    111     }
    112   return destptr;
    113 }
    114 
    115 #endif
    116 
    117