libgfortran/generated/count_4_l4.c

   1 /* Implementation of the COUNT intrinsic
   2    Copyright 2002, 2007 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 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Libgfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 Boston, MA 02110-1301, USA.  */
  30
  31 #include "libgfortran.h"
  32 #include <stdlib.h>
  33 #include <assert.h>
  34
  35
  36 #if defined (HAVE_GFC_LOGICAL_4) && defined (HAVE_GFC_INTEGER_4)
  37
  38
  39 extern void count_4_l4 (gfc_array_i4 * const restrict,
  40         gfc_array_l4 * const restrict, const index_type * const restrict);
  41 export_proto(count_4_l4);
  42
  43 void
  44 count_4_l4 (gfc_array_i4 * const restrict retarray,
  45         gfc_array_l4 * const restrict array,
  46         const index_type * const restrict pdim)
  47 {
  48   index_type count[GFC_MAX_DIMENSIONS];
  49   index_type extent[GFC_MAX_DIMENSIONS];
  50   index_type sstride[GFC_MAX_DIMENSIONS];
  51   index_type dstride[GFC_MAX_DIMENSIONS];
  52   const GFC_LOGICAL_4 * restrict base;
  53   GFC_INTEGER_4 * restrict dest;
  54   index_type rank;
  55   index_type n;
  56   index_type len;
  57   index_type delta;
  58   index_type dim;
  59
  60   /* Make dim zero based to avoid confusion.  */
  61   dim = (*pdim) - 1;
  62   rank = GFC_DESCRIPTOR_RANK (array) - 1;
  63
  64   len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
  65   delta = array->dim[dim].stride;
  66
  67   for (n = 0; n < dim; n++)
  68     {
  69       sstride[n] = array->dim[n].stride;
  70       extent[n] = array->dim[n].ubound + 1 - array->dim[n].lbound;
  71
  72       if (extent[n] < 0)
  73         extent[n] = 0;
  74     }
  75   for (n = dim; n < rank; n++)
  76     {
  77       sstride[n] = array->dim[n + 1].stride;
  78       extent[n] =
  79         array->dim[n + 1].ubound + 1 - array->dim[n + 1].lbound;
  80
  81       if (extent[n] < 0)
  82         extent[n] = 0;
  83     }
  84
  85   if (retarray->data == NULL)
  86     {
  87       size_t alloc_size;
  88
  89       for (n = 0; n < rank; n++)
  90         {
  91           retarray->dim[n].lbound = 0;
  92           retarray->dim[n].ubound = extent[n]-1;
  93           if (n == 0)
  94             retarray->dim[n].stride = 1;
  95           else
  96             retarray->dim[n].stride = retarray->dim[n-1].stride * extent[n-1];
  97         }
  98
  99       retarray->offset = 0;
 100       retarray->dtype = (array->dtype & ~GFC_DTYPE_RANK_MASK) | rank;
 101
 102       alloc_size = sizeof (GFC_INTEGER_4) * retarray->dim[rank-1].stride
 103                    * extent[rank-1];
 104
 105       if (alloc_size == 0)
 106         {
 107           /* Make sure we have a zero-sized array.  */
 108           retarray->dim[0].lbound = 0;
 109           retarray->dim[0].ubound = -1;
 110           return;
 111         }
 112       else
 113         retarray->data = internal_malloc_size (alloc_size);
 114     }
 115   else
 116     {
 117       if (rank != GFC_DESCRIPTOR_RANK (retarray))
 118         runtime_error ("rank of return array incorrect");
 119     }
 120
 121   for (n = 0; n < rank; n++)
 122     {
 123       count[n] = 0;
 124       dstride[n] = retarray->dim[n].stride;
 125       if (extent[n] <= 0)
 126         len = 0;
 127     }
 128
 129   base = array->data;
 130   dest = retarray->data;
 131
 132   while (base)
 133     {
 134       const GFC_LOGICAL_4 * restrict src;
 135       GFC_INTEGER_4 result;
 136       src = base;
 137       {
 138
 139   result = 0;
 140         if (len <= 0)
 141           *dest = 0;
 142         else
 143           {
 144             for (n = 0; n < len; n++, src += delta)
 145               {
 146
 147   if (*src)
 148     result++;
 149           }
 150             *dest = result;
 151           }
 152       }
 153       /* Advance to the next element.  */
 154       count[0]++;
 155       base += sstride[0];
 156       dest += dstride[0];
 157       n = 0;
 158       while (count[n] == extent[n])
 159         {
 160           /* When we get to the end of a dimension, reset it and increment
 161              the next dimension.  */
 162           count[n] = 0;
 163           /* We could precalculate these products, but this is a less
 164              frequently used path so probably not worth it.  */
 165           base -= sstride[n] * extent[n];
 166           dest -= dstride[n] * extent[n];
 167           n++;
 168           if (n == rank)
 169             {
 170               /* Break out of the look.  */
 171               base = NULL;
 172               break;
 173             }
 174           else
 175             {
 176               count[n]++;
 177               base += sstride[n];
 178               dest += dstride[n];
 179             }
 180         }
 181     }
 182 }
 183
 184 #endif