libgfortran/generated/parity_l1.c

   1 /* Implementation of the PARITY intrinsic
   2    Copyright (C) 2010-2024 Free Software Foundation, Inc.
   3    Contributed by Tobias Burnus  <burnus@net-b.de>
   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_LOGICAL_1) && defined (HAVE_GFC_LOGICAL_1)
  30
  31
  32 extern void parity_l1 (gfc_array_l1 * const restrict,
  33         gfc_array_l1 * const restrict, const index_type * const restrict);
  34 export_proto(parity_l1);
  35
  36 void
  37 parity_l1 (gfc_array_l1 * const restrict retarray,
  38         gfc_array_l1 * const restrict array,
  39         const index_type * const restrict pdim)
  40 {
  41   index_type count[GFC_MAX_DIMENSIONS];
  42   index_type extent[GFC_MAX_DIMENSIONS];
  43   index_type sstride[GFC_MAX_DIMENSIONS];
  44   index_type dstride[GFC_MAX_DIMENSIONS];
  45   const GFC_LOGICAL_1 * restrict base;
  46   GFC_LOGICAL_1 * restrict dest;
  47   index_type rank;
  48   index_type n;
  49   index_type len;
  50   index_type delta;
  51   index_type dim;
  52   int continue_loop;
  53
  54   /* Make dim zero based to avoid confusion.  */
  55   rank = GFC_DESCRIPTOR_RANK (array) - 1;
  56   dim = (*pdim) - 1;
  57
  58   if (unlikely (dim < 0 || dim > rank))
  59     {
  60       runtime_error ("Dim argument incorrect in PARITY intrinsic: "
  61                      "is %ld, should be between 1 and %ld",
  62                      (long int) dim + 1, (long int) rank + 1);
  63     }
  64
  65   len = GFC_DESCRIPTOR_EXTENT(array,dim);
  66   if (len < 0)
  67     len = 0;
  68   delta = GFC_DESCRIPTOR_STRIDE(array,dim);
  69
  70   for (n = 0; n < dim; n++)
  71     {
  72       sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);
  73       extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
  74
  75       if (extent[n] < 0)
  76         extent[n] = 0;
  77     }
  78   for (n = dim; n < rank; n++)
  79     {
  80       sstride[n] = GFC_DESCRIPTOR_STRIDE(array, n + 1);
  81       extent[n] = GFC_DESCRIPTOR_EXTENT(array, n + 1);
  82
  83       if (extent[n] < 0)
  84         extent[n] = 0;
  85     }
  86
  87   if (retarray->base_addr == NULL)
  88     {
  89       size_t alloc_size, str;
  90
  91       for (n = 0; n < rank; n++)
  92         {
  93           if (n == 0)
  94             str = 1;
  95           else
  96             str = GFC_DESCRIPTOR_STRIDE(retarray,n-1) * extent[n-1];
  97
  98           GFC_DIMENSION_SET(retarray->dim[n], 0, extent[n] - 1, str);
  99
 100         }
 101
 102       retarray->offset = 0;
 103       retarray->dtype.rank = rank;
 104
 105       alloc_size = GFC_DESCRIPTOR_STRIDE(retarray,rank-1) * extent[rank-1];
 106
 107       retarray->base_addr = xmallocarray (alloc_size, sizeof (GFC_LOGICAL_1));
 108       if (alloc_size == 0)
 109         return;
 110     }
 111   else
 112     {
 113       if (rank != GFC_DESCRIPTOR_RANK (retarray))
 114         runtime_error ("rank of return array incorrect in"
 115                        " PARITY intrinsic: is %ld, should be %ld",
 116                        (long int) (GFC_DESCRIPTOR_RANK (retarray)),
 117                        (long int) rank);
 118
 119       if (unlikely (compile_options.bounds_check))
 120         bounds_ifunction_return ((array_t *) retarray, extent,
 121                                  "return value", "PARITY");
 122     }
 123
 124   for (n = 0; n < rank; n++)
 125     {
 126       count[n] = 0;
 127       dstride[n] = GFC_DESCRIPTOR_STRIDE(retarray,n);
 128       if (extent[n] <= 0)
 129         return;
 130     }
 131
 132   base = array->base_addr;
 133   dest = retarray->base_addr;
 134
 135   continue_loop = 1;
 136   while (continue_loop)
 137     {
 138       const GFC_LOGICAL_1 * restrict src;
 139       GFC_LOGICAL_1 result;
 140       src = base;
 141       {
 142
 143   result = 0;
 144         if (len <= 0)
 145           *dest = 0;
 146         else
 147           {
 148 #if ! defined HAVE_BACK_ARG
 149             for (n = 0; n < len; n++, src += delta)
 150               {
 151 #endif
 152
 153   result = result != *src;
 154               }
 155
 156             *dest = result;
 157           }
 158       }
 159       /* Advance to the next element.  */
 160       count[0]++;
 161       base += sstride[0];
 162       dest += dstride[0];
 163       n = 0;
 164       while (count[n] == extent[n])
 165         {
 166           /* When we get to the end of a dimension, reset it and increment
 167              the next dimension.  */
 168           count[n] = 0;
 169           /* We could precalculate these products, but this is a less
 170              frequently used path so probably not worth it.  */
 171           base -= sstride[n] * extent[n];
 172           dest -= dstride[n] * extent[n];
 173           n++;
 174           if (n >= rank)
 175             {
 176               /* Break out of the loop.  */
 177               continue_loop = 0;
 178               break;
 179             }
 180           else
 181             {
 182               count[n]++;
 183               base += sstride[n];
 184               dest += dstride[n];
 185             }
 186         }
 187     }
 188 }
 189
 190 #endif