libgfortran/generated/count_4_l.c

   1 /* Implementation of the COUNT intrinsic
   2    Copyright 2002, 2007, 2009 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran 95 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 <assert.h>
  29
  30
  31 #if defined (HAVE_GFC_INTEGER_4)
  32
  33
  34 extern void count_4_l (gfc_array_i4 * const restrict,
  35         gfc_array_l1 * const restrict, const index_type * const restrict);
  36 export_proto(count_4_l);
  37
  38 void
  39 count_4_l (gfc_array_i4 * const restrict retarray,
  40         gfc_array_l1 * const restrict array,
  41         const index_type * const restrict pdim)
  42 {
  43   index_type count[GFC_MAX_DIMENSIONS];
  44   index_type extent[GFC_MAX_DIMENSIONS];
  45   index_type sstride[GFC_MAX_DIMENSIONS];
  46   index_type dstride[GFC_MAX_DIMENSIONS];
  47   const GFC_LOGICAL_1 * restrict base;
  48   GFC_INTEGER_4 * restrict dest;
  49   index_type rank;
  50   index_type n;
  51   index_type len;
  52   index_type delta;
  53   index_type dim;
  54   int src_kind;
  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   src_kind = GFC_DESCRIPTOR_SIZE (array);
  62
  63   len = GFC_DESCRIPTOR_EXTENT(array,dim);
  64   if (len < 0)
  65     len = 0;
  66
  67   delta = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
  68
  69   for (n = 0; n < dim; n++)
  70     {
  71       sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,n);
  72       extent[n] = GFC_DESCRIPTOR_EXTENT(array,n);
  73
  74       if (extent[n] < 0)
  75         extent[n] = 0;
  76     }
  77   for (n = dim; n < rank; n++)
  78     {
  79       sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,n + 1);
  80       extent[n] = GFC_DESCRIPTOR_EXTENT(array,n + 1);
  81
  82       if (extent[n] < 0)
  83         extent[n] = 0;
  84     }
  85
  86   if (retarray->data == NULL)
  87     {
  88       size_t alloc_size, str;
  89
  90       for (n = 0; n < rank; n++)
  91         {
  92           if (n == 0)
  93             str = 1;
  94           else
  95             str = GFC_DESCRIPTOR_STRIDE(retarray,n-1) * extent[n-1];
  96
  97           GFC_DIMENSION_SET(retarray->dim[n], 0, extent[n] - 1, str);
  98
  99         }
 100
 101       retarray->offset = 0;
 102       retarray->dtype = (array->dtype & ~GFC_DTYPE_RANK_MASK) | rank;
 103
 104       alloc_size = sizeof (GFC_INTEGER_4) * GFC_DESCRIPTOR_STRIDE(retarray,rank-1)
 105                    * extent[rank-1];
 106
 107       if (alloc_size == 0)
 108         {
 109           /* Make sure we have a zero-sized array.  */
 110           GFC_DIMENSION_SET(retarray->dim[0], 0, -1, 1);
 111           return;
 112         }
 113       else
 114         retarray->data = internal_malloc_size (alloc_size);
 115     }
 116   else
 117     {
 118       if (rank != GFC_DESCRIPTOR_RANK (retarray))
 119         runtime_error ("rank of return array incorrect in"
 120                        " COUNT 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         {
 126           for (n=0; n < rank; n++)
 127             {
 128               index_type ret_extent;
 129
 130               ret_extent = GFC_DESCRIPTOR_EXTENT(retarray,n);
 131               if (extent[n] != ret_extent)
 132                 runtime_error ("Incorrect extent in return value of"
 133                                " COUNT intrinsic in dimension %d:"
 134                                " is %ld, should be %ld", (int) n + 1,
 135                                (long int) ret_extent, (long int) extent[n]);
 136             }
 137         }
 138     }
 139
 140   for (n = 0; n < rank; n++)
 141     {
 142       count[n] = 0;
 143       dstride[n] = GFC_DESCRIPTOR_STRIDE(retarray,n);
 144       if (extent[n] <= 0)
 145         len = 0;
 146     }
 147
 148   base = array->data;
 149
 150   if (src_kind == 1 || src_kind == 2 || src_kind == 4 || src_kind == 8
 151 #ifdef HAVE_GFC_LOGICAL_16
 152       || src_kind == 16
 153 #endif
 154     )
 155     {
 156       if (base)
 157         base = GFOR_POINTER_TO_L1 (base, src_kind);
 158     }
 159   else
 160     internal_error (NULL, "Funny sized logical array in COUNT intrinsic");
 161
 162   dest = retarray->data;
 163
 164   continue_loop = 1;
 165   while (continue_loop)
 166     {
 167       const GFC_LOGICAL_1 * restrict src;
 168       GFC_INTEGER_4 result;
 169       src = base;
 170       {
 171
 172   result = 0;
 173         if (len <= 0)
 174           *dest = 0;
 175         else
 176           {
 177             for (n = 0; n < len; n++, src += delta)
 178               {
 179
 180   if (*src)
 181     result++;
 182           }
 183             *dest = result;
 184           }
 185       }
 186       /* Advance to the next element.  */
 187       count[0]++;
 188       base += sstride[0];
 189       dest += dstride[0];
 190       n = 0;
 191       while (count[n] == extent[n])
 192         {
 193           /* When we get to the end of a dimension, reset it and increment
 194              the next dimension.  */
 195           count[n] = 0;
 196           /* We could precalculate these products, but this is a less
 197              frequently used path so probably not worth it.  */
 198           base -= sstride[n] * extent[n];
 199           dest -= dstride[n] * extent[n];
 200           n++;
 201           if (n == rank)
 202             {
 203               /* Break out of the look.  */
 204               continue_loop = 0;
 205               break;
 206             }
 207           else
 208             {
 209               count[n]++;
 210               base += sstride[n];
 211               dest += dstride[n];
 212             }
 213         }
 214     }
 215 }
 216
 217 #endif