libgfortran/generated/reshape_r4.c

   1 /* Implementation of the RESHAPE
   2    Copyright 2002, 2006 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 "config.h"
  32 #include <stdlib.h>
  33 #include <assert.h>
  34 #include "libgfortran.h"
  35
  36 #if defined (HAVE_GFC_REAL_4)
  37
  38 typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type;
  39
  40
  41 extern void reshape_r4 (gfc_array_r4 * const restrict,
  42         gfc_array_r4 * const restrict,
  43         shape_type * const restrict,
  44         gfc_array_r4 * const restrict,
  45         shape_type * const restrict);
  46 export_proto(reshape_r4);
  47
  48 void
  49 reshape_r4 (gfc_array_r4 * const restrict ret,
  50         gfc_array_r4 * const restrict source,
  51         shape_type * const restrict shape,
  52         gfc_array_r4 * const restrict pad,
  53         shape_type * const restrict order)
  54 {
  55   /* r.* indicates the return array.  */
  56   index_type rcount[GFC_MAX_DIMENSIONS];
  57   index_type rextent[GFC_MAX_DIMENSIONS];
  58   index_type rstride[GFC_MAX_DIMENSIONS];
  59   index_type rstride0;
  60   index_type rdim;
  61   index_type rsize;
  62   index_type rs;
  63   index_type rex;
  64   GFC_REAL_4 *rptr;
  65   /* s.* indicates the source array.  */
  66   index_type scount[GFC_MAX_DIMENSIONS];
  67   index_type sextent[GFC_MAX_DIMENSIONS];
  68   index_type sstride[GFC_MAX_DIMENSIONS];
  69   index_type sstride0;
  70   index_type sdim;
  71   index_type ssize;
  72   const GFC_REAL_4 *sptr;
  73   /* p.* indicates the pad array.  */
  74   index_type pcount[GFC_MAX_DIMENSIONS];
  75   index_type pextent[GFC_MAX_DIMENSIONS];
  76   index_type pstride[GFC_MAX_DIMENSIONS];
  77   index_type pdim;
  78   index_type psize;
  79   const GFC_REAL_4 *pptr;
  80
  81   const GFC_REAL_4 *src;
  82   int n;
  83   int dim;
  84   int sempty, pempty;
  85
  86   if (ret->data == NULL)
  87     {
  88       rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1;
  89       rs = 1;
  90       for (n = 0; n < rdim; n++)
  91         {
  92           ret->dim[n].lbound = 0;
  93           rex = shape->data[n * shape->dim[0].stride];
  94           ret->dim[n].ubound =  rex - 1;
  95           ret->dim[n].stride = rs;
  96           rs *= rex;
  97         }
  98       ret->offset = 0;
  99       ret->data = internal_malloc_size ( rs * sizeof (GFC_REAL_4));
 100       ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rdim;
 101     }
 102   else
 103     {
 104       rdim = GFC_DESCRIPTOR_RANK (ret);
 105     }
 106
 107   rsize = 1;
 108   for (n = 0; n < rdim; n++)
 109     {
 110       if (order)
 111         dim = order->data[n * order->dim[0].stride] - 1;
 112       else
 113         dim = n;
 114
 115       rcount[n] = 0;
 116       rstride[n] = ret->dim[dim].stride;
 117       rextent[n] = ret->dim[dim].ubound + 1 - ret->dim[dim].lbound;
 118
 119       if (rextent[n] != shape->data[dim * shape->dim[0].stride])
 120         runtime_error ("shape and target do not conform");
 121
 122       if (rsize == rstride[n])
 123         rsize *= rextent[n];
 124       else
 125         rsize = 0;
 126       if (rextent[n] <= 0)
 127         return;
 128     }
 129
 130   sdim = GFC_DESCRIPTOR_RANK (source);
 131   ssize = 1;
 132   sempty = 0;
 133   for (n = 0; n < sdim; n++)
 134     {
 135       scount[n] = 0;
 136       sstride[n] = source->dim[n].stride;
 137       sextent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
 138       if (sextent[n] <= 0)
 139         {
 140           sempty = 1;
 141           sextent[n] = 0;
 142         }
 143
 144       if (ssize == sstride[n])
 145         ssize *= sextent[n];
 146       else
 147         ssize = 0;
 148     }
 149
 150   if (pad)
 151     {
 152       pdim = GFC_DESCRIPTOR_RANK (pad);
 153       psize = 1;
 154       pempty = 0;
 155       for (n = 0; n < pdim; n++)
 156         {
 157           pcount[n] = 0;
 158           pstride[n] = pad->dim[n].stride;
 159           pextent[n] = pad->dim[n].ubound + 1 - pad->dim[n].lbound;
 160           if (pextent[n] <= 0)
 161             {
 162               pempty = 1;
 163               pextent[n] = 0;
 164             }
 165
 166           if (psize == pstride[n])
 167             psize *= pextent[n];
 168           else
 169             psize = 0;
 170         }
 171       pptr = pad->data;
 172     }
 173   else
 174     {
 175       pdim = 0;
 176       psize = 1;
 177       pempty = 1;
 178       pptr = NULL;
 179     }
 180
 181   if (rsize != 0 && ssize != 0 && psize != 0)
 182     {
 183       rsize *= sizeof (GFC_REAL_4);
 184       ssize *= sizeof (GFC_REAL_4);
 185       psize *= sizeof (GFC_REAL_4);
 186       reshape_packed ((char *)ret->data, rsize, (char *)source->data,
 187                       ssize, pad ? (char *)pad->data : NULL, psize);
 188       return;
 189     }
 190   rptr = ret->data;
 191   src = sptr = source->data;
 192   rstride0 = rstride[0];
 193   sstride0 = sstride[0];
 194
 195   if (sempty && pempty)
 196     abort ();
 197
 198   if (sempty)
 199     {
 200       /* Switch immediately to the pad array.  */
 201       src = pptr;
 202       sptr = NULL;
 203       sdim = pdim;
 204       for (dim = 0; dim < pdim; dim++)
 205         {
 206           scount[dim] = pcount[dim];
 207           sextent[dim] = pextent[dim];
 208           sstride[dim] = pstride[dim];
 209           sstride0 = sstride[0] * sizeof (GFC_REAL_4);
 210         }
 211     }
 212
 213   while (rptr)
 214     {
 215       /* Select between the source and pad arrays.  */
 216       *rptr = *src;
 217       /* Advance to the next element.  */
 218       rptr += rstride0;
 219       src += sstride0;
 220       rcount[0]++;
 221       scount[0]++;
 222
 223       /* Advance to the next destination element.  */
 224       n = 0;
 225       while (rcount[n] == rextent[n])
 226         {
 227           /* When we get to the end of a dimension, reset it and increment
 228              the next dimension.  */
 229           rcount[n] = 0;
 230           /* We could precalculate these products, but this is a less
 231              frequently used path so probably not worth it.  */
 232           rptr -= rstride[n] * rextent[n];
 233           n++;
 234           if (n == rdim)
 235             {
 236               /* Break out of the loop.  */
 237               rptr = NULL;
 238               break;
 239             }
 240           else
 241             {
 242               rcount[n]++;
 243               rptr += rstride[n];
 244             }
 245         }
 246       /* Advance to the next source element.  */
 247       n = 0;
 248       while (scount[n] == sextent[n])
 249         {
 250           /* When we get to the end of a dimension, reset it and increment
 251              the next dimension.  */
 252           scount[n] = 0;
 253           /* We could precalculate these products, but this is a less
 254              frequently used path so probably not worth it.  */
 255           src -= sstride[n] * sextent[n];
 256           n++;
 257           if (n == sdim)
 258             {
 259               if (sptr && pad)
 260                 {
 261                   /* Switch to the pad array.  */
 262                   sptr = NULL;
 263                   sdim = pdim;
 264                   for (dim = 0; dim < pdim; dim++)
 265                     {
 266                       scount[dim] = pcount[dim];
 267                       sextent[dim] = pextent[dim];
 268                       sstride[dim] = pstride[dim];
 269                       sstride0 = sstride[0];
 270                     }
 271                 }
 272               /* We now start again from the beginning of the pad array.  */
 273               src = pptr;
 274               break;
 275             }
 276           else
 277             {
 278               scount[n]++;
 279               src += sstride[n];
 280             }
 281         }
 282     }
 283 }
 284
 285 #endif