libgfortran/generated/reshape_r8.c

   1 /* Implementation of the RESHAPE intrinsic
   2    Copyright (C) 2002-2018 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   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
  28
  29 #if defined (HAVE_GFC_REAL_8)
  30
  31 typedef GFC_FULL_ARRAY_DESCRIPTOR(1, index_type) shape_type;
  32
  33
  34 extern void reshape_r8 (gfc_array_r8 * const restrict,
  35         gfc_array_r8 * const restrict,
  36         shape_type * const restrict,
  37         gfc_array_r8 * const restrict,
  38         shape_type * const restrict);
  39 export_proto(reshape_r8);
  40
  41 void
  42 reshape_r8 (gfc_array_r8 * const restrict ret,
  43         gfc_array_r8 * const restrict source,
  44         shape_type * const restrict shape,
  45         gfc_array_r8 * const restrict pad,
  46         shape_type * const restrict order)
  47 {
  48   /* r.* indicates the return array.  */
  49   index_type rcount[GFC_MAX_DIMENSIONS];
  50   index_type rextent[GFC_MAX_DIMENSIONS];
  51   index_type rstride[GFC_MAX_DIMENSIONS];
  52   index_type rstride0;
  53   index_type rdim;
  54   index_type rsize;
  55   index_type rs;
  56   index_type rex;
  57   GFC_REAL_8 *rptr;
  58   /* s.* indicates the source array.  */
  59   index_type scount[GFC_MAX_DIMENSIONS];
  60   index_type sextent[GFC_MAX_DIMENSIONS];
  61   index_type sstride[GFC_MAX_DIMENSIONS];
  62   index_type sstride0;
  63   index_type sdim;
  64   index_type ssize;
  65   const GFC_REAL_8 *sptr;
  66   /* p.* indicates the pad array.  */
  67   index_type pcount[GFC_MAX_DIMENSIONS];
  68   index_type pextent[GFC_MAX_DIMENSIONS];
  69   index_type pstride[GFC_MAX_DIMENSIONS];
  70   index_type pdim;
  71   index_type psize;
  72   const GFC_REAL_8 *pptr;
  73
  74   const GFC_REAL_8 *src;
  75   int sempty, pempty, shape_empty;
  76   index_type shape_data[GFC_MAX_DIMENSIONS];
  77
  78   rdim = GFC_DESCRIPTOR_EXTENT(shape,0);
  79   /* rdim is always > 0; this lets the compiler optimize more and
  80    avoids a potential warning.  */
  81   GFC_ASSERT(rdim>0);
  82
  83   if (rdim != GFC_DESCRIPTOR_RANK(ret))
  84     runtime_error("rank of return array incorrect in RESHAPE intrinsic");
  85
  86   shape_empty = 0;
  87
  88   for (index_type n = 0; n < rdim; n++)
  89     {
  90       shape_data[n] = shape->base_addr[n * GFC_DESCRIPTOR_STRIDE(shape,0)];
  91       if (shape_data[n] <= 0)
  92       {
  93         shape_data[n] = 0;
  94         shape_empty = 1;
  95       }
  96     }
  97
  98   if (ret->base_addr == NULL)
  99     {
 100       index_type alloc_size;
 101
 102       rs = 1;
 103       for (index_type n = 0; n < rdim; n++)
 104         {
 105           rex = shape_data[n];
 106
 107           GFC_DIMENSION_SET(ret->dim[n], 0, rex - 1, rs);
 108
 109           rs *= rex;
 110         }
 111       ret->offset = 0;
 112
 113       if (unlikely (rs < 1))
 114         alloc_size = 0;
 115       else
 116         alloc_size = rs;
 117
 118       ret->base_addr = xmallocarray (alloc_size, sizeof (GFC_REAL_8));
 119       ret->dtype.rank = rdim;
 120     }
 121
 122   if (shape_empty)
 123     return;
 124
 125   if (pad)
 126     {
 127       pdim = GFC_DESCRIPTOR_RANK (pad);
 128       psize = 1;
 129       pempty = 0;
 130       for (index_type n = 0; n < pdim; n++)
 131         {
 132           pcount[n] = 0;
 133           pstride[n] = GFC_DESCRIPTOR_STRIDE(pad,n);
 134           pextent[n] = GFC_DESCRIPTOR_EXTENT(pad,n);
 135           if (pextent[n] <= 0)
 136             {
 137               pempty = 1;
 138               pextent[n] = 0;
 139             }
 140
 141           if (psize == pstride[n])
 142             psize *= pextent[n];
 143           else
 144             psize = 0;
 145         }
 146       pptr = pad->base_addr;
 147     }
 148   else
 149     {
 150       pdim = 0;
 151       psize = 1;
 152       pempty = 1;
 153       pptr = NULL;
 154     }
 155
 156   if (unlikely (compile_options.bounds_check))
 157     {
 158       index_type ret_extent, source_extent;
 159
 160       rs = 1;
 161       for (index_type n = 0; n < rdim; n++)
 162         {
 163           rs *= shape_data[n];
 164           ret_extent = GFC_DESCRIPTOR_EXTENT(ret,n);
 165           if (ret_extent != shape_data[n])
 166             runtime_error("Incorrect extent in return value of RESHAPE"
 167                           " intrinsic in dimension %ld: is %ld,"
 168                           " should be %ld", (long int) n+1,
 169                           (long int) ret_extent, (long int) shape_data[n]);
 170         }
 171
 172       source_extent = 1;
 173       sdim = GFC_DESCRIPTOR_RANK (source);
 174       for (index_type n = 0; n < sdim; n++)
 175         {
 176           index_type se;
 177           se = GFC_DESCRIPTOR_EXTENT(source,n);
 178           source_extent *= se > 0 ? se : 0;
 179         }
 180
 181       if (rs > source_extent && (!pad || pempty))
 182         runtime_error("Incorrect size in SOURCE argument to RESHAPE"
 183                       " intrinsic: is %ld, should be %ld",
 184                       (long int) source_extent, (long int) rs);
 185
 186       if (order)
 187         {
 188           int seen[GFC_MAX_DIMENSIONS];
 189           index_type v;
 190
 191           for (index_type n = 0; n < rdim; n++)
 192             seen[n] = 0;
 193
 194           for (index_type n = 0; n < rdim; n++)
 195             {
 196               v = order->base_addr[n * GFC_DESCRIPTOR_STRIDE(order,0)] - 1;
 197
 198               if (v < 0 || v >= rdim)
 199                 runtime_error("Value %ld out of range in ORDER argument"
 200                               " to RESHAPE intrinsic", (long int) v + 1);
 201
 202               if (seen[v] != 0)
 203                 runtime_error("Duplicate value %ld in ORDER argument to"
 204                               " RESHAPE intrinsic", (long int) v + 1);
 205
 206               seen[v] = 1;
 207             }
 208         }
 209     }
 210
 211   rsize = 1;
 212   for (index_type n = 0; n < rdim; n++)
 213     {
 214       index_type dim;
 215       if (order)
 216         dim = order->base_addr[n * GFC_DESCRIPTOR_STRIDE(order,0)] - 1;
 217       else
 218         dim = n;
 219
 220       rcount[n] = 0;
 221       rstride[n] = GFC_DESCRIPTOR_STRIDE(ret,dim);
 222       rextent[n] = GFC_DESCRIPTOR_EXTENT(ret,dim);
 223       if (rextent[n] < 0)
 224         rextent[n] = 0;
 225
 226       if (rextent[n] != shape_data[dim])
 227         runtime_error ("shape and target do not conform");
 228
 229       if (rsize == rstride[n])
 230         rsize *= rextent[n];
 231       else
 232         rsize = 0;
 233       if (rextent[n] <= 0)
 234         return;
 235     }
 236
 237   sdim = GFC_DESCRIPTOR_RANK (source);
 238
 239   /* sdim is always > 0; this lets the compiler optimize more and
 240    avoids a warning.  */
 241   GFC_ASSERT(sdim>0);
 242
 243   ssize = 1;
 244   sempty = 0;
 245   for (index_type n = 0; n < sdim; n++)
 246     {
 247       scount[n] = 0;
 248       sstride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
 249       sextent[n] = GFC_DESCRIPTOR_EXTENT(source,n);
 250       if (sextent[n] <= 0)
 251         {
 252           sempty = 1;
 253           sextent[n] = 0;
 254         }
 255
 256       if (ssize == sstride[n])
 257         ssize *= sextent[n];
 258       else
 259         ssize = 0;
 260     }
 261
 262   if (rsize != 0 && ssize != 0 && psize != 0)
 263     {
 264       rsize *= sizeof (GFC_REAL_8);
 265       ssize *= sizeof (GFC_REAL_8);
 266       psize *= sizeof (GFC_REAL_8);
 267       reshape_packed ((char *)ret->base_addr, rsize, (char *)source->base_addr,
 268                       ssize, pad ? (char *)pad->base_addr : NULL, psize);
 269       return;
 270     }
 271   rptr = ret->base_addr;
 272   src = sptr = source->base_addr;
 273   rstride0 = rstride[0];
 274   sstride0 = sstride[0];
 275
 276   if (sempty && pempty)
 277     abort ();
 278
 279   if (sempty)
 280     {
 281       /* Pretend we are using the pad array the first time around, too.  */
 282       src = pptr;
 283       sptr = pptr;
 284       sdim = pdim;
 285       for (index_type dim = 0; dim < pdim; dim++)
 286         {
 287           scount[dim] = pcount[dim];
 288           sextent[dim] = pextent[dim];
 289           sstride[dim] = pstride[dim];
 290           sstride0 = pstride[0];
 291         }
 292     }
 293
 294   while (rptr)
 295     {
 296       /* Select between the source and pad arrays.  */
 297       *rptr = *src;
 298       /* Advance to the next element.  */
 299       rptr += rstride0;
 300       src += sstride0;
 301       rcount[0]++;
 302       scount[0]++;
 303
 304       /* Advance to the next destination element.  */
 305       index_type n = 0;
 306       while (rcount[n] == rextent[n])
 307         {
 308           /* When we get to the end of a dimension, reset it and increment
 309              the next dimension.  */
 310           rcount[n] = 0;
 311           /* We could precalculate these products, but this is a less
 312              frequently used path so probably not worth it.  */
 313           rptr -= rstride[n] * rextent[n];
 314           n++;
 315           if (n == rdim)
 316             {
 317               /* Break out of the loop.  */
 318               rptr = NULL;
 319               break;
 320             }
 321           else
 322             {
 323               rcount[n]++;
 324               rptr += rstride[n];
 325             }
 326         }
 327       /* Advance to the next source element.  */
 328       n = 0;
 329       while (scount[n] == sextent[n])
 330         {
 331           /* When we get to the end of a dimension, reset it and increment
 332              the next dimension.  */
 333           scount[n] = 0;
 334           /* We could precalculate these products, but this is a less
 335              frequently used path so probably not worth it.  */
 336           src -= sstride[n] * sextent[n];
 337           n++;
 338           if (n == sdim)
 339             {
 340               if (sptr && pad)
 341                 {
 342                   /* Switch to the pad array.  */
 343                   sptr = NULL;
 344                   sdim = pdim;
 345                   for (index_type dim = 0; dim < pdim; dim++)
 346                     {
 347                       scount[dim] = pcount[dim];
 348                       sextent[dim] = pextent[dim];
 349                       sstride[dim] = pstride[dim];
 350                       sstride0 = sstride[0];
 351                     }
 352                 }
 353               /* We now start again from the beginning of the pad array.  */
 354               src = pptr;
 355               break;
 356             }
 357           else
 358             {
 359               scount[n]++;
 360               src += sstride[n];
 361             }
 362         }
 363     }
 364 }
 365
 366 #endif