libgfortran/generated/parity_l1.c

   1 /* Implementation of the PARITY intrinsic
   2    Copyright (C) 2010-2013 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 #include <stdlib.h>
  28 #include <math.h>
  29 #include <assert.h>
  30
  31
  32 #if defined (HAVE_GFC_LOGICAL_1) && defined (HAVE_GFC_LOGICAL_1)
  33
  34
  35 extern void parity_l1 (gfc_array_l1 * const restrict,
  36         gfc_array_l1 * const restrict, const index_type * const restrict);
  37 export_proto(parity_l1);
  38
  39 void
  40 parity_l1 (gfc_array_l1 * const restrict retarray,
  41         gfc_array_l1 * const restrict array,
  42         const index_type * const restrict pdim)
  43 {
  44   index_type count[GFC_MAX_DIMENSIONS];
  45   index_type extent[GFC_MAX_DIMENSIONS];
  46   index_type sstride[GFC_MAX_DIMENSIONS];
  47   index_type dstride[GFC_MAX_DIMENSIONS];
  48   const GFC_LOGICAL_1 * restrict base;
  49   GFC_LOGICAL_1 * restrict dest;
  50   index_type rank;
  51   index_type n;
  52   index_type len;
  53   index_type delta;
  54   index_type dim;
  55   int continue_loop;
  56
  57   /* Make dim zero based to avoid confusion.  */
  58   dim = (*pdim) - 1;
  59   rank = GFC_DESCRIPTOR_RANK (array) - 1;
  60
  61   len = GFC_DESCRIPTOR_EXTENT(array,dim);
  62   if (len < 0)
  63     len = 0;
  64   delta = GFC_DESCRIPTOR_STRIDE(array,dim);
  65
  66   for (n = 0; n < dim; n++)
  67     {
  68       sstride[n] = GFC_DESCRIPTOR_STRIDE(array,n);
  69       extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
  70
  71       if (extent[n] < 0)
  72         extent[n] = 0;
  73     }
  74   for (n = dim; n < rank; n++)
  75     {
  76       sstride[n] = GFC_DESCRIPTOR_STRIDE(array, n + 1);
  77       extent[n] = GFC_DESCRIPTOR_EXTENT(array, n + 1);
  78
  79       if (extent[n] < 0)
  80         extent[n] = 0;
  81     }
  82
  83   if (retarray->base_addr == NULL)
  84     {
  85       size_t alloc_size, str;
  86
  87       for (n = 0; n < rank; n++)
  88         {
  89           if (n == 0)
  90             str = 1;
  91           else
  92             str = GFC_DESCRIPTOR_STRIDE(retarray,n-1) * extent[n-1];
  93
  94           GFC_DIMENSION_SET(retarray->dim[n], 0, extent[n] - 1, str);
  95
  96         }
  97
  98       retarray->offset = 0;
  99       retarray->dtype = (array->dtype & ~GFC_DTYPE_RANK_MASK) | rank;
 100
 101       alloc_size = sizeof (GFC_LOGICAL_1) * GFC_DESCRIPTOR_STRIDE(retarray,rank-1)
 102                    * extent[rank-1];
 103
 104       retarray->base_addr = xmalloc (alloc_size);
 105       if (alloc_size == 0)
 106         {
 107           /* Make sure we have a zero-sized array.  */
 108           GFC_DIMENSION_SET(retarray->dim[0], 0, -1, 1);
 109           return;
 110
 111         }
 112     }
 113   else
 114     {
 115       if (rank != GFC_DESCRIPTOR_RANK (retarray))
 116         runtime_error ("rank of return array incorrect in"
 117                        " PARITY intrinsic: is %ld, should be %ld",
 118                        (long int) (GFC_DESCRIPTOR_RANK (retarray)),
 119                        (long int) rank);
 120
 121       if (unlikely (compile_options.bounds_check))
 122         bounds_ifunction_return ((array_t *) retarray, extent,
 123                                  "return value", "PARITY");
 124     }
 125
 126   for (n = 0; n < rank; n++)
 127     {
 128       count[n] = 0;
 129       dstride[n] = GFC_DESCRIPTOR_STRIDE(retarray,n);
 130       if (extent[n] <= 0)
 131         return;
 132     }
 133
 134   base = array->base_addr;
 135   dest = retarray->base_addr;
 136
 137   continue_loop = 1;
 138   while (continue_loop)
 139     {
 140       const GFC_LOGICAL_1 * restrict src;
 141       GFC_LOGICAL_1 result;
 142       src = base;
 143       {
 144
 145   result = 0;
 146         if (len <= 0)
 147           *dest = 0;
 148         else
 149           {
 150             for (n = 0; n < len; n++, src += delta)
 151               {
 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 look.  */
 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