libgfortran/generated/maxloc1_4_r8.c

   1 /* Implementation of the MAXLOC intrinsic
   2    Copyright 2002 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 (libgfor).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Lesser General Public
   9 License as published by the Free Software Foundation; either
  10 version 2.1 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 Lesser General Public License for more details.
  16
  17 You should have received a copy of the GNU Lesser General Public
  18 License along with libgfor; see the file COPYING.LIB.  If not,
  19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include <stdlib.h>
  24 #include <assert.h>
  25 #include <float.h>
  26 #include <limits.h>
  27 #include "libgfortran.h"
  28
  29 void
  30 __maxloc1_4_r8 (gfc_array_i4 * retarray, gfc_array_r8 *array, index_type *pdim)
  31 {
  32   index_type count[GFC_MAX_DIMENSIONS - 1];
  33   index_type extent[GFC_MAX_DIMENSIONS - 1];
  34   index_type sstride[GFC_MAX_DIMENSIONS - 1];
  35   index_type dstride[GFC_MAX_DIMENSIONS - 1];
  36   GFC_REAL_8 *base;
  37   GFC_INTEGER_4 *dest;
  38   index_type rank;
  39   index_type n;
  40   index_type len;
  41   index_type delta;
  42   index_type dim;
  43
  44   /* Make dim zero based to avoid confusion.  */
  45   dim = (*pdim) - 1;
  46   rank = GFC_DESCRIPTOR_RANK (array) - 1;
  47   assert (rank == GFC_DESCRIPTOR_RANK (retarray));
  48   if (array->dim[0].stride == 0)
  49     array->dim[0].stride = 1;
  50   if (retarray->dim[0].stride == 0)
  51     retarray->dim[0].stride = 1;
  52
  53   len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
  54   delta = array->dim[dim].stride;
  55
  56   for (n = 0; n < dim; n++)
  57     {
  58       sstride[n] = array->dim[n].stride;
  59       extent[n] = array->dim[n].ubound + 1 - array->dim[n].lbound;
  60     }
  61   for (n = dim; n < rank; n++)
  62     {
  63       sstride[n] = array->dim[n + 1].stride;
  64       extent[n] =
  65         array->dim[n + 1].ubound + 1 - array->dim[n + 1].lbound;
  66     }
  67
  68   if (retarray->data == NULL)
  69     {
  70       for (n = 0; n < rank; n++)
  71         {
  72           retarray->dim[n].lbound = 0;
  73           retarray->dim[n].ubound = extent[n]-1;
  74           if (n == 0)
  75             retarray->dim[n].stride = 1;
  76           else
  77             retarray->dim[n].stride = retarray->dim[n-1].stride * extent[n-1];
  78         }
  79
  80       retarray->data = internal_malloc (sizeof (GFC_INTEGER_4) *
  81                                         (retarray->dim[rank-1].stride * extent[rank-1]));
  82       retarray->base = 0;
  83     }
  84
  85   for (n = 0; n < rank; n++)
  86     {
  87       count[n] = 0;
  88       dstride[n] = retarray->dim[n].stride;
  89       if (extent[n] <= 0)
  90         len = 0;
  91     }
  92
  93   base = array->data;
  94   dest = retarray->data;
  95
  96   while (base)
  97     {
  98       GFC_REAL_8 *src;
  99       GFC_INTEGER_4 result;
 100       src = base;
 101       {
 102
 103   GFC_REAL_8 maxval;
 104   maxval = -GFC_REAL_8_HUGE;
 105   result = 1;
 106         if (len <= 0)
 107           *dest = 0;
 108         else
 109           {
 110             for (n = 0; n < len; n++, src += delta)
 111               {
 112
 113   if (*src > maxval)
 114     {
 115       maxval = *src;
 116       result = (GFC_INTEGER_4)n + 1;
 117     }
 118           }
 119             *dest = result;
 120           }
 121       }
 122       /* Advance to the next element.  */
 123       count[0]++;
 124       base += sstride[0];
 125       dest += dstride[0];
 126       n = 0;
 127       while (count[n] == extent[n])
 128         {
 129           /* When we get to the end of a dimension, reset it and increment
 130              the next dimension.  */
 131           count[n] = 0;
 132           /* We could precalculate these products, but this is a less
 133              frequently used path so proabably not worth it.  */
 134           base -= sstride[n] * extent[n];
 135           dest -= dstride[n] * extent[n];
 136           n++;
 137           if (n == rank)
 138             {
 139               /* Break out of the look.  */
 140               base = NULL;
 141               break;
 142             }
 143           else
 144             {
 145               count[n]++;
 146               base += sstride[n];
 147               dest += dstride[n];
 148             }
 149         }
 150     }
 151 }
 152
 153 void
 154 __mmaxloc1_4_r8 (gfc_array_i4 * retarray, gfc_array_r8 * array, index_type *pdim, gfc_array_l4 * mask)
 155 {
 156   index_type count[GFC_MAX_DIMENSIONS - 1];
 157   index_type extent[GFC_MAX_DIMENSIONS - 1];
 158   index_type sstride[GFC_MAX_DIMENSIONS - 1];
 159   index_type dstride[GFC_MAX_DIMENSIONS - 1];
 160   index_type mstride[GFC_MAX_DIMENSIONS - 1];
 161   GFC_INTEGER_4 *dest;
 162   GFC_REAL_8 *base;
 163   GFC_LOGICAL_4 *mbase;
 164   int rank;
 165   int dim;
 166   index_type n;
 167   index_type len;
 168   index_type delta;
 169   index_type mdelta;
 170
 171   dim = (*pdim) - 1;
 172   rank = GFC_DESCRIPTOR_RANK (array) - 1;
 173   assert (rank == GFC_DESCRIPTOR_RANK (retarray));
 174   if (array->dim[0].stride == 0)
 175     array->dim[0].stride = 1;
 176   if (retarray->dim[0].stride == 0)
 177     retarray->dim[0].stride = 1;
 178
 179   len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
 180   if (len <= 0)
 181     return;
 182   delta = array->dim[dim].stride;
 183   mdelta = mask->dim[dim].stride;
 184
 185   for (n = 0; n < dim; n++)
 186     {
 187       sstride[n] = array->dim[n].stride;
 188       mstride[n] = mask->dim[n].stride;
 189       extent[n] = array->dim[n].ubound + 1 - array->dim[n].lbound;
 190     }
 191   for (n = dim; n < rank; n++)
 192     {
 193       sstride[n] = array->dim[n + 1].stride;
 194       mstride[n] = mask->dim[n + 1].stride;
 195       extent[n] =
 196         array->dim[n + 1].ubound + 1 - array->dim[n + 1].lbound;
 197     }
 198
 199   for (n = 0; n < rank; n++)
 200     {
 201       count[n] = 0;
 202       dstride[n] = retarray->dim[n].stride;
 203       if (extent[n] <= 0)
 204         return;
 205     }
 206
 207   dest = retarray->data;
 208   base = array->data;
 209   mbase = mask->data;
 210
 211   if (GFC_DESCRIPTOR_SIZE (mask) != 4)
 212     {
 213       /* This allows the same loop to be used for all logical types.  */
 214       assert (GFC_DESCRIPTOR_SIZE (mask) == 8);
 215       for (n = 0; n < rank; n++)
 216         mstride[n] <<= 1;
 217       mdelta <<= 1;
 218       mbase = (GFOR_POINTER_L8_TO_L4 (mbase));
 219     }
 220
 221   while (base)
 222     {
 223       GFC_REAL_8 *src;
 224       GFC_LOGICAL_4 *msrc;
 225       GFC_INTEGER_4 result;
 226       src = base;
 227       msrc = mbase;
 228       {
 229
 230   GFC_REAL_8 maxval;
 231   maxval = -GFC_REAL_8_HUGE;
 232   result = 1;
 233         if (len <= 0)
 234           *dest = 0;
 235         else
 236           {
 237             for (n = 0; n < len; n++, src += delta, msrc += mdelta)
 238               {
 239
 240   if (*msrc && *src > maxval)
 241     {
 242       maxval = *src;
 243       result = (GFC_INTEGER_4)n + 1;
 244     }
 245               }
 246             *dest = result;
 247           }
 248       }
 249       /* Advance to the next element.  */
 250       count[0]++;
 251       base += sstride[0];
 252       mbase += mstride[0];
 253       dest += dstride[0];
 254       n = 0;
 255       while (count[n] == extent[n])
 256         {
 257           /* When we get to the end of a dimension, reset it and increment
 258              the next dimension.  */
 259           count[n] = 0;
 260           /* We could precalculate these products, but this is a less
 261              frequently used path so proabably not worth it.  */
 262           base -= sstride[n] * extent[n];
 263           mbase -= mstride[n] * extent[n];
 264           dest -= dstride[n] * extent[n];
 265           n++;
 266           if (n == rank)
 267             {
 268               /* Break out of the look.  */
 269               base = NULL;
 270               break;
 271             }
 272           else
 273             {
 274               count[n]++;
 275               base += sstride[n];
 276               mbase += mstride[n];
 277               dest += dstride[n];
 278             }
 279         }
 280     }
 281 }
 282