libgfortran/generated/parity_l1.c

   1 /* Implementation of the PARITY intrinsic
   2    Copyright (C) 2010-2019 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         {
 110           /* Make sure we have a zero-sized array.  */
 111           GFC_DIMENSION_SET(retarray->dim[0], 0, -1, 1);
 112           return;
 113
 114         }
 115     }
 116   else
 117     {
 118       if (rank != GFC_DESCRIPTOR_RANK (retarray))
 119         runtime_error ("rank of return array incorrect in"
 120                        " PARITY intrinsic: is %ld, should be %ld",
 121                        (long int) (GFC_DESCRIPTOR_RANK (retarray)),
 122                        (long int) rank);
 123
 124       if (unlikely (compile_options.bounds_check))
 125         bounds_ifunction_return ((array_t *) retarray, extent,
 126                                  "return value", "PARITY");
 127     }
 128
 129   for (n = 0; n < rank; n++)
 130     {
 131       count[n] = 0;
 132       dstride[n] = GFC_DESCRIPTOR_STRIDE(retarray,n);
 133       if (extent[n] <= 0)
 134         return;
 135     }
 136
 137   base = array->base_addr;
 138   dest = retarray->base_addr;
 139
 140   continue_loop = 1;
 141   while (continue_loop)
 142     {
 143       const GFC_LOGICAL_1 * restrict src;
 144       GFC_LOGICAL_1 result;
 145       src = base;
 146       {
 147
 148   result = 0;
 149         if (len <= 0)
 150           *dest = 0;
 151         else
 152           {
 153 #if ! defined HAVE_BACK_ARG
 154             for (n = 0; n < len; n++, src += delta)
 155               {
 156 #endif
 157
 158   result = result != *src;
 159               }
 160
 161             *dest = result;
 162           }
 163       }
 164       /* Advance to the next element.  */
 165       count[0]++;
 166       base += sstride[0];
 167       dest += dstride[0];
 168       n = 0;
 169       while (count[n] == extent[n])
 170         {
 171           /* When we get to the end of a dimension, reset it and increment
 172              the next dimension.  */
 173           count[n] = 0;
 174           /* We could precalculate these products, but this is a less
 175              frequently used path so probably not worth it.  */
 176           base -= sstride[n] * extent[n];
 177           dest -= dstride[n] * extent[n];
 178           n++;
 179           if (n >= rank)
 180             {
 181               /* Break out of the loop.  */
 182               continue_loop = 0;
 183               break;
 184             }
 185           else
 186             {
 187               count[n]++;
 188               base += sstride[n];
 189               dest += dstride[n];
 190             }
 191         }
 192     }
 193 }
 194
 195 #endif