libgfortran/generated/parity_l4.c

   1 /* Implementation of the PARITY intrinsic
   2    Copyright (C) 2010-2014 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_4) && defined (HAVE_GFC_LOGICAL_4)
  33
  34
  35 extern void parity_l4 (gfc_array_l4 * const restrict,
  36         gfc_array_l4 * const restrict, const index_type * const restrict);
  37 export_proto(parity_l4);
  38
  39 void
  40 parity_l4 (gfc_array_l4 * const restrict retarray,
  41         gfc_array_l4 * 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_4 * restrict base;
  49   GFC_LOGICAL_4 * 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 = GFC_DESCRIPTOR_STRIDE(retarray,rank-1) * extent[rank-1];
 102
 103       retarray->base_addr = xmallocarray (alloc_size, sizeof (GFC_LOGICAL_4));
 104       if (alloc_size == 0)
 105         {
 106           /* Make sure we have a zero-sized array.  */
 107           GFC_DIMENSION_SET(retarray->dim[0], 0, -1, 1);
 108           return;
 109
 110         }
 111     }
 112   else
 113     {
 114       if (rank != GFC_DESCRIPTOR_RANK (retarray))
 115         runtime_error ("rank of return array incorrect in"
 116                        " PARITY intrinsic: is %ld, should be %ld",
 117                        (long int) (GFC_DESCRIPTOR_RANK (retarray)),
 118                        (long int) rank);
 119
 120       if (unlikely (compile_options.bounds_check))
 121         bounds_ifunction_return ((array_t *) retarray, extent,
 122                                  "return value", "PARITY");
 123     }
 124
 125   for (n = 0; n < rank; n++)
 126     {
 127       count[n] = 0;
 128       dstride[n] = GFC_DESCRIPTOR_STRIDE(retarray,n);
 129       if (extent[n] <= 0)
 130         return;
 131     }
 132
 133   base = array->base_addr;
 134   dest = retarray->base_addr;
 135
 136   continue_loop = 1;
 137   while (continue_loop)
 138     {
 139       const GFC_LOGICAL_4 * restrict src;
 140       GFC_LOGICAL_4 result;
 141       src = base;
 142       {
 143
 144   result = 0;
 145         if (len <= 0)
 146           *dest = 0;
 147         else
 148           {
 149             for (n = 0; n < len; n++, src += delta)
 150               {
 151
 152   result = result != *src;
 153               }
 154
 155             *dest = result;
 156           }
 157       }
 158       /* Advance to the next element.  */
 159       count[0]++;
 160       base += sstride[0];
 161       dest += dstride[0];
 162       n = 0;
 163       while (count[n] == extent[n])
 164         {
 165           /* When we get to the end of a dimension, reset it and increment
 166              the next dimension.  */
 167           count[n] = 0;
 168           /* We could precalculate these products, but this is a less
 169              frequently used path so probably not worth it.  */
 170           base -= sstride[n] * extent[n];
 171           dest -= dstride[n] * extent[n];
 172           n++;
 173           if (n == rank)
 174             {
 175               /* Break out of the look.  */
 176               continue_loop = 0;
 177               break;
 178             }
 179           else
 180             {
 181               count[n]++;
 182               base += sstride[n];
 183               dest += dstride[n];
 184             }
 185         }
 186     }
 187 }
 188
 189 #endif