1 /* Generic implementation of the RESHAPE intrinsic
2 Copyright 2002, 2006, 2007 Free Software Foundation, Inc.
3 Contributed by Paul Brook <paul@nowt.org>
5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
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.
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
21 Ligbfortran 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.
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. */
31 #include "libgfortran.h"
36 typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type;
37 typedef GFC_ARRAY_DESCRIPTOR(GFC_MAX_DIMENSIONS, char) parray;
40 reshape_internal (parray *ret, parray *source, shape_type *shape,
41 parray *pad, shape_type *order, index_type size)
43 /* r.* indicates the return array. */
44 index_type rcount[GFC_MAX_DIMENSIONS];
45 index_type rextent[GFC_MAX_DIMENSIONS];
46 index_type rstride[GFC_MAX_DIMENSIONS];
53 /* s.* indicates the source array. */
54 index_type scount[GFC_MAX_DIMENSIONS];
55 index_type sextent[GFC_MAX_DIMENSIONS];
56 index_type sstride[GFC_MAX_DIMENSIONS];
61 /* p.* indicates the pad array. */
62 index_type pcount[GFC_MAX_DIMENSIONS];
63 index_type pextent[GFC_MAX_DIMENSIONS];
64 index_type pstride[GFC_MAX_DIMENSIONS];
72 int sempty, pempty, shape_empty;
73 index_type shape_data[GFC_MAX_DIMENSIONS];
75 rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1;
76 if (rdim != GFC_DESCRIPTOR_RANK(ret))
77 runtime_error("rank of return array incorrect in RESHAPE intrinsic");
81 for (n = 0; n < rdim; n++)
83 shape_data[n] = shape->data[n * shape->dim[0].stride];
84 if (shape_data[n] <= 0)
91 if (ret->data == NULL)
93 rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1;
95 for (n = 0; n < rdim; n++)
97 ret->dim[n].lbound = 0;
99 ret->dim[n].ubound = rex - 1;
100 ret->dim[n].stride = rs;
104 ret->data = internal_malloc_size ( rs * size );
105 ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rdim;
111 if (unlikely (compile_options.bounds_check))
115 int seen[GFC_MAX_DIMENSIONS];
118 for (n = 0; n < rdim; n++)
121 for (n = 0; n < rdim; n++)
123 v = order->data[n * order->dim[0].stride] - 1;
125 if (v < 0 || v >= rdim)
126 runtime_error("Value %ld out of range in ORDER argument"
127 " to RESHAPE intrinsic", (long int) v + 1);
130 runtime_error("Duplicate value %ld in ORDER argument to"
131 " RESHAPE intrinsic", (long int) v + 1);
139 for (n = 0; n < rdim; n++)
142 dim = order->data[n * order->dim[0].stride] - 1;
147 rstride[n] = ret->dim[dim].stride;
148 rextent[n] = ret->dim[dim].ubound + 1 - ret->dim[dim].lbound;
150 if (rextent[n] != shape_data[dim])
151 runtime_error ("shape and target do not conform");
153 if (rsize == rstride[n])
161 sdim = GFC_DESCRIPTOR_RANK (source);
164 for (n = 0; n < sdim; n++)
167 sstride[n] = source->dim[n].stride;
168 sextent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
175 if (ssize == sstride[n])
183 pdim = GFC_DESCRIPTOR_RANK (pad);
186 for (n = 0; n < pdim; n++)
189 pstride[n] = pad->dim[n].stride;
190 pextent[n] = pad->dim[n].ubound + 1 - pad->dim[n].lbound;
197 if (psize == pstride[n])
212 if (rsize != 0 && ssize != 0 && psize != 0)
217 reshape_packed (ret->data, rsize, source->data, ssize,
218 pad ? pad->data : NULL, psize);
222 src = sptr = source->data;
223 rstride0 = rstride[0] * size;
224 sstride0 = sstride[0] * size;
226 if (sempty && pempty)
231 /* Switch immediately to the pad array. */
235 for (dim = 0; dim < pdim; dim++)
237 scount[dim] = pcount[dim];
238 sextent[dim] = pextent[dim];
239 sstride[dim] = pstride[dim];
240 sstride0 = sstride[0] * size;
246 /* Select between the source and pad arrays. */
247 memcpy(rptr, src, size);
248 /* Advance to the next element. */
254 /* Advance to the next destination element. */
256 while (rcount[n] == rextent[n])
258 /* When we get to the end of a dimension, reset it and increment
259 the next dimension. */
261 /* We could precalculate these products, but this is a less
262 frequently used path so probably not worth it. */
263 rptr -= rstride[n] * rextent[n] * size;
267 /* Break out of the loop. */
274 rptr += rstride[n] * size;
278 /* Advance to the next source element. */
280 while (scount[n] == sextent[n])
282 /* When we get to the end of a dimension, reset it and increment
283 the next dimension. */
285 /* We could precalculate these products, but this is a less
286 frequently used path so probably not worth it. */
287 src -= sstride[n] * sextent[n] * size;
293 /* Switch to the pad array. */
296 for (dim = 0; dim < pdim; dim++)
298 scount[dim] = pcount[dim];
299 sextent[dim] = pextent[dim];
300 sstride[dim] = pstride[dim];
301 sstride0 = sstride[0] * size;
304 /* We now start again from the beginning of the pad array. */
311 src += sstride[n] * size;
317 extern void reshape (parray *, parray *, shape_type *, parray *, shape_type *);
318 export_proto(reshape);
321 reshape (parray *ret, parray *source, shape_type *shape, parray *pad,
324 reshape_internal (ret, source, shape, pad, order,
325 GFC_DESCRIPTOR_SIZE (source));
329 extern void reshape_char (parray *, gfc_charlen_type, parray *, shape_type *,
330 parray *, shape_type *, gfc_charlen_type,
332 export_proto(reshape_char);
335 reshape_char (parray *ret, gfc_charlen_type ret_length __attribute__((unused)),
336 parray *source, shape_type *shape, parray *pad,
337 shape_type *order, gfc_charlen_type source_length,
338 gfc_charlen_type pad_length __attribute__((unused)))
340 reshape_internal (ret, source, shape, pad, order, source_length);
344 extern void reshape_char4 (parray *, gfc_charlen_type, parray *, shape_type *,
345 parray *, shape_type *, gfc_charlen_type,
347 export_proto(reshape_char4);
350 reshape_char4 (parray *ret, gfc_charlen_type ret_length __attribute__((unused)),
351 parray *source, shape_type *shape, parray *pad,
352 shape_type *order, gfc_charlen_type source_length,
353 gfc_charlen_type pad_length __attribute__((unused)))
355 reshape_internal (ret, source, shape, pad, order,
356 source_length * sizeof (gfc_char4_t));