libgfortran/generated/parity_l1.c

   1 /* Implementation of the PARITY intrinsic
   2    Copyright (C) 2010-2018 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 #ifdef HAVE_BACK_ARG
  55   assert(back == 0);
  56 #endif
  57
  58   /* Make dim zero based to avoid confusion.  */
  59   rank = GFC_DESCRIPTOR_RANK (array) - 1;
  60   dim = (*pdim) - 1;
  61
  62   if (unlikely (dim < 0 || dim > rank))
  63     {
  64       runtime_error ("Dim argument incorrect in PARITY intrinsic: "
  65                      "is %ld, should be between 1 and %ld",
  66                      (long int) dim + 1, (long int) rank + 1);
  67     }
  68
  69   len = GFC_DESCRIPTOR_EXTENT(array,dim);
  70   if (len < 0)
  71     len = 0;
  72   delta = GFC_DESCRIPTOR_STRIDE(array,dim);
  73
  74   for (n = 0; n < dim; n++)
  75     {
  76       sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);
  77       extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
  78
  79       if (extent[n] < 0)
  80         extent[n] = 0;
  81     }
  82   for (n = dim; n < rank; n++)
  83     {
  84       sstride[n] = GFC_DESCRIPTOR_STRIDE(array, n + 1);
  85       extent[n] = GFC_DESCRIPTOR_EXTENT(array, n + 1);
  86
  87       if (extent[n] < 0)
  88         extent[n] = 0;
  89     }
  90
  91   if (retarray->base_addr == NULL)
  92     {
  93       size_t alloc_size, str;
  94
  95       for (n = 0; n < rank; n++)
  96         {
  97           if (n == 0)
  98             str = 1;
  99           else
 100             str = GFC_DESCRIPTOR_STRIDE(retarray,n-1) * extent[n-1];
 101
 102           GFC_DIMENSION_SET(retarray->dim[n], 0, extent[n] - 1, str);
 103
 104         }
 105
 106       retarray->offset = 0;
 107       GFC_DTYPE_COPY_SETRANK(retarray,array,rank);
 108
 109       alloc_size = GFC_DESCRIPTOR_STRIDE(retarray,rank-1) * extent[rank-1];
 110
 111       retarray->base_addr = xmallocarray (alloc_size, sizeof (GFC_LOGICAL_1));
 112       if (alloc_size == 0)
 113         {
 114           /* Make sure we have a zero-sized array.  */
 115           GFC_DIMENSION_SET(retarray->dim[0], 0, -1, 1);
 116           return;
 117
 118         }
 119     }
 120   else
 121     {
 122       if (rank != GFC_DESCRIPTOR_RANK (retarray))
 123         runtime_error ("rank of return array incorrect in"
 124                        " PARITY intrinsic: is %ld, should be %ld",
 125                        (long int) (GFC_DESCRIPTOR_RANK (retarray)),
 126                        (long int) rank);
 127
 128       if (unlikely (compile_options.bounds_check))
 129         bounds_ifunction_return ((array_t *) retarray, extent,
 130                                  "return value", "PARITY");
 131     }
 132
 133   for (n = 0; n < rank; n++)
 134     {
 135       count[n] = 0;
 136       dstride[n] = GFC_DESCRIPTOR_STRIDE(retarray,n);
 137       if (extent[n] <= 0)
 138         return;
 139     }
 140
 141   base = array->base_addr;
 142   dest = retarray->base_addr;
 143
 144   continue_loop = 1;
 145   while (continue_loop)
 146     {
 147       const GFC_LOGICAL_1 * restrict src;
 148       GFC_LOGICAL_1 result;
 149       src = base;
 150       {
 151
 152   result = 0;
 153         if (len <= 0)
 154           *dest = 0;
 155         else
 156           {
 157             for (n = 0; n < len; n++, src += delta)
 158               {
 159
 160   result = result != *src;
 161               }
 162
 163             *dest = result;
 164           }
 165       }
 166       /* Advance to the next element.  */
 167       count[0]++;
 168       base += sstride[0];
 169       dest += dstride[0];
 170       n = 0;
 171       while (count[n] == extent[n])
 172         {
 173           /* When we get to the end of a dimension, reset it and increment
 174              the next dimension.  */
 175           count[n] = 0;
 176           /* We could precalculate these products, but this is a less
 177              frequently used path so probably not worth it.  */
 178           base -= sstride[n] * extent[n];
 179           dest -= dstride[n] * extent[n];
 180           n++;
 181           if (n >= rank)
 182             {
 183               /* Break out of the loop.  */
 184               continue_loop = 0;
 185               break;
 186             }
 187           else
 188             {
 189               count[n]++;
 190               base += sstride[n];
 191               dest += dstride[n];
 192             }
 193         }
 194     }
 195 }
 196
 197 #endif