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))
113 index_type ret_extent, source_extent;
116 for (n = 0; n < rdim; n++)
119 ret_extent = ret->dim[n].ubound + 1 - ret->dim[n].lbound;
120 if (ret_extent != shape_data[n])
121 runtime_error("Incorrect extent in return value of RESHAPE"
122 " intrinsic in dimension %ld: is %ld,"
123 " should be %ld", (long int) n+1,
124 (long int) ret_extent, (long int) shape_data[n]);
127 source_extent = source->dim[0].ubound + 1 - source->dim[0].lbound;
129 if (rs != source_extent)
130 runtime_error("Incorrect size in SOURCE argument to RESHAPE"
131 " intrinsic: is %ld, should be %ld",
132 (long int) source_extent, (long int) rs);
136 int seen[GFC_MAX_DIMENSIONS];
139 for (n = 0; n < rdim; n++)
142 for (n = 0; n < rdim; n++)
144 v = order->data[n * order->dim[0].stride] - 1;
146 if (v < 0 || v >= rdim)
147 runtime_error("Value %ld out of range in ORDER argument"
148 " to RESHAPE intrinsic", (long int) v + 1);
151 runtime_error("Duplicate value %ld in ORDER argument to"
152 " RESHAPE intrinsic", (long int) v + 1);
160 for (n = 0; n < rdim; n++)
163 dim = order->data[n * order->dim[0].stride] - 1;
168 rstride[n] = ret->dim[dim].stride;
169 rextent[n] = ret->dim[dim].ubound + 1 - ret->dim[dim].lbound;
171 if (rextent[n] != shape_data[dim])
172 runtime_error ("shape and target do not conform");
174 if (rsize == rstride[n])
182 sdim = GFC_DESCRIPTOR_RANK (source);
185 for (n = 0; n < sdim; n++)
188 sstride[n] = source->dim[n].stride;
189 sextent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
196 if (ssize == sstride[n])
204 pdim = GFC_DESCRIPTOR_RANK (pad);
207 for (n = 0; n < pdim; n++)
210 pstride[n] = pad->dim[n].stride;
211 pextent[n] = pad->dim[n].ubound + 1 - pad->dim[n].lbound;
218 if (psize == pstride[n])
233 if (rsize != 0 && ssize != 0 && psize != 0)
238 reshape_packed (ret->data, rsize, source->data, ssize,
239 pad ? pad->data : NULL, psize);
243 src = sptr = source->data;
244 rstride0 = rstride[0] * size;
245 sstride0 = sstride[0] * size;
247 if (sempty && pempty)
252 /* Switch immediately to the pad array. */
256 for (dim = 0; dim < pdim; dim++)
258 scount[dim] = pcount[dim];
259 sextent[dim] = pextent[dim];
260 sstride[dim] = pstride[dim];
261 sstride0 = sstride[0] * size;
267 /* Select between the source and pad arrays. */
268 memcpy(rptr, src, size);
269 /* Advance to the next element. */
275 /* Advance to the next destination element. */
277 while (rcount[n] == rextent[n])
279 /* When we get to the end of a dimension, reset it and increment
280 the next dimension. */
282 /* We could precalculate these products, but this is a less
283 frequently used path so probably not worth it. */
284 rptr -= rstride[n] * rextent[n] * size;
288 /* Break out of the loop. */
295 rptr += rstride[n] * size;
299 /* Advance to the next source element. */
301 while (scount[n] == sextent[n])
303 /* When we get to the end of a dimension, reset it and increment
304 the next dimension. */
306 /* We could precalculate these products, but this is a less
307 frequently used path so probably not worth it. */
308 src -= sstride[n] * sextent[n] * size;
314 /* Switch to the pad array. */
317 for (dim = 0; dim < pdim; dim++)
319 scount[dim] = pcount[dim];
320 sextent[dim] = pextent[dim];
321 sstride[dim] = pstride[dim];
322 sstride0 = sstride[0] * size;
325 /* We now start again from the beginning of the pad array. */
332 src += sstride[n] * size;
338 extern void reshape (parray *, parray *, shape_type *, parray *, shape_type *);
339 export_proto(reshape);
342 reshape (parray *ret, parray *source, shape_type *shape, parray *pad,
345 reshape_internal (ret, source, shape, pad, order,
346 GFC_DESCRIPTOR_SIZE (source));
350 extern void reshape_char (parray *, gfc_charlen_type, parray *, shape_type *,
351 parray *, shape_type *, gfc_charlen_type,
353 export_proto(reshape_char);
356 reshape_char (parray *ret, gfc_charlen_type ret_length __attribute__((unused)),
357 parray *source, shape_type *shape, parray *pad,
358 shape_type *order, gfc_charlen_type source_length,
359 gfc_charlen_type pad_length __attribute__((unused)))
361 reshape_internal (ret, source, shape, pad, order, source_length);
365 extern void reshape_char4 (parray *, gfc_charlen_type, parray *, shape_type *,
366 parray *, shape_type *, gfc_charlen_type,
368 export_proto(reshape_char4);
371 reshape_char4 (parray *ret, gfc_charlen_type ret_length __attribute__((unused)),
372 parray *source, shape_type *shape, parray *pad,
373 shape_type *order, gfc_charlen_type source_length,
374 gfc_charlen_type pad_length __attribute__((unused)))
376 reshape_internal (ret, source, shape, pad, order,
377 source_length * sizeof (gfc_char4_t));