libgfortran/generated/reshape_i4.c

   1 /* Implementation of the RESHAPE intrinsic
   2    Copyright (C) 2002-2014 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 #include <stdlib.h>
  28 #include <assert.h>
  29
  30
  31 #if defined (HAVE_GFC_INTEGER_4)
  32
  33 typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type;
  34
  35
  36 extern void reshape_4 (gfc_array_i4 * const restrict,
  37         gfc_array_i4 * const restrict,
  38         shape_type * const restrict,
  39         gfc_array_i4 * const restrict,
  40         shape_type * const restrict);
  41 export_proto(reshape_4);
  42
  43 void
  44 reshape_4 (gfc_array_i4 * const restrict ret,
  45         gfc_array_i4 * const restrict source,
  46         shape_type * const restrict shape,
  47         gfc_array_i4 * const restrict pad,
  48         shape_type * const restrict order)
  49 {
  50   /* r.* indicates the return array.  */
  51   index_type rcount[GFC_MAX_DIMENSIONS];
  52   index_type rextent[GFC_MAX_DIMENSIONS];
  53   index_type rstride[GFC_MAX_DIMENSIONS];
  54   index_type rstride0;
  55   index_type rdim;
  56   index_type rsize;
  57   index_type rs;
  58   index_type rex;
  59   GFC_INTEGER_4 *rptr;
  60   /* s.* indicates the source array.  */
  61   index_type scount[GFC_MAX_DIMENSIONS];
  62   index_type sextent[GFC_MAX_DIMENSIONS];
  63   index_type sstride[GFC_MAX_DIMENSIONS];
  64   index_type sstride0;
  65   index_type sdim;
  66   index_type ssize;
  67   const GFC_INTEGER_4 *sptr;
  68   /* p.* indicates the pad array.  */
  69   index_type pcount[GFC_MAX_DIMENSIONS];
  70   index_type pextent[GFC_MAX_DIMENSIONS];
  71   index_type pstride[GFC_MAX_DIMENSIONS];
  72   index_type pdim;
  73   index_type psize;
  74   const GFC_INTEGER_4 *pptr;
  75
  76   const GFC_INTEGER_4 *src;
  77   int n;
  78   int dim;
  79   int sempty, pempty, shape_empty;
  80   index_type shape_data[GFC_MAX_DIMENSIONS];
  81
  82   rdim = GFC_DESCRIPTOR_EXTENT(shape,0);
  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 (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 (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_INTEGER_4));
 119       ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | 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 (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 (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 (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 (n = 0; n < rdim; n++)
 192             seen[n] = 0;
 193
 194           for (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 (n = 0; n < rdim; n++)
 213     {
 214       if (order)
 215         dim = order->base_addr[n * GFC_DESCRIPTOR_STRIDE(order,0)] - 1;
 216       else
 217         dim = n;
 218
 219       rcount[n] = 0;
 220       rstride[n] = GFC_DESCRIPTOR_STRIDE(ret,dim);
 221       rextent[n] = GFC_DESCRIPTOR_EXTENT(ret,dim);
 222       if (rextent[n] < 0)
 223         rextent[n] = 0;
 224
 225       if (rextent[n] != shape_data[dim])
 226         runtime_error ("shape and target do not conform");
 227
 228       if (rsize == rstride[n])
 229         rsize *= rextent[n];
 230       else
 231         rsize = 0;
 232       if (rextent[n] <= 0)
 233         return;
 234     }
 235
 236   sdim = GFC_DESCRIPTOR_RANK (source);
 237   ssize = 1;
 238   sempty = 0;
 239   for (n = 0; n < sdim; n++)
 240     {
 241       scount[n] = 0;
 242       sstride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
 243       sextent[n] = GFC_DESCRIPTOR_EXTENT(source,n);
 244       if (sextent[n] <= 0)
 245         {
 246           sempty = 1;
 247           sextent[n] = 0;
 248         }
 249
 250       if (ssize == sstride[n])
 251         ssize *= sextent[n];
 252       else
 253         ssize = 0;
 254     }
 255
 256   if (rsize != 0 && ssize != 0 && psize != 0)
 257     {
 258       rsize *= sizeof (GFC_INTEGER_4);
 259       ssize *= sizeof (GFC_INTEGER_4);
 260       psize *= sizeof (GFC_INTEGER_4);
 261       reshape_packed ((char *)ret->base_addr, rsize, (char *)source->base_addr,
 262                       ssize, pad ? (char *)pad->base_addr : NULL, psize);
 263       return;
 264     }
 265   rptr = ret->base_addr;
 266   src = sptr = source->base_addr;
 267   rstride0 = rstride[0];
 268   sstride0 = sstride[0];
 269
 270   if (sempty && pempty)
 271     abort ();
 272
 273   if (sempty)
 274     {
 275       /* Pretend we are using the pad array the first time around, too.  */
 276       src = pptr;
 277       sptr = pptr;
 278       sdim = pdim;
 279       for (dim = 0; dim < pdim; dim++)
 280         {
 281           scount[dim] = pcount[dim];
 282           sextent[dim] = pextent[dim];
 283           sstride[dim] = pstride[dim];
 284           sstride0 = pstride[0];
 285         }
 286     }
 287
 288   while (rptr)
 289     {
 290       /* Select between the source and pad arrays.  */
 291       *rptr = *src;
 292       /* Advance to the next element.  */
 293       rptr += rstride0;
 294       src += sstride0;
 295       rcount[0]++;
 296       scount[0]++;
 297
 298       /* Advance to the next destination element.  */
 299       n = 0;
 300       while (rcount[n] == rextent[n])
 301         {
 302           /* When we get to the end of a dimension, reset it and increment
 303              the next dimension.  */
 304           rcount[n] = 0;
 305           /* We could precalculate these products, but this is a less
 306              frequently used path so probably not worth it.  */
 307           rptr -= rstride[n] * rextent[n];
 308           n++;
 309           if (n == rdim)
 310             {
 311               /* Break out of the loop.  */
 312               rptr = NULL;
 313               break;
 314             }
 315           else
 316             {
 317               rcount[n]++;
 318               rptr += rstride[n];
 319             }
 320         }
 321       /* Advance to the next source element.  */
 322       n = 0;
 323       while (scount[n] == sextent[n])
 324         {
 325           /* When we get to the end of a dimension, reset it and increment
 326              the next dimension.  */
 327           scount[n] = 0;
 328           /* We could precalculate these products, but this is a less
 329              frequently used path so probably not worth it.  */
 330           src -= sstride[n] * sextent[n];
 331           n++;
 332           if (n == sdim)
 333             {
 334               if (sptr && pad)
 335                 {
 336                   /* Switch to the pad array.  */
 337                   sptr = NULL;
 338                   sdim = pdim;
 339                   for (dim = 0; dim < pdim; dim++)
 340                     {
 341                       scount[dim] = pcount[dim];
 342                       sextent[dim] = pextent[dim];
 343                       sstride[dim] = pstride[dim];
 344                       sstride0 = sstride[0];
 345                     }
 346                 }
 347               /* We now start again from the beginning of the pad array.  */
 348               src = pptr;
 349               break;
 350             }
 351           else
 352             {
 353               scount[n]++;
 354               src += sstride[n];
 355             }
 356         }
 357     }
 358 }
 359
 360 #endif