1 /* Generic implementation of the RESHAPE intrinsic
2 Copyright 2002, 2006, 2007, 2009 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 3 of the License, or (at your option) any later version.
12 Ligbfortran 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.
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.
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/>. */
26 #include "libgfortran.h"
31 typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type;
32 typedef GFC_ARRAY_DESCRIPTOR(GFC_MAX_DIMENSIONS, char) parray;
35 reshape_internal (parray *ret, parray *source, shape_type *shape,
36 parray *pad, shape_type *order, index_type size)
38 /* r.* indicates the return array. */
39 index_type rcount[GFC_MAX_DIMENSIONS];
40 index_type rextent[GFC_MAX_DIMENSIONS];
41 index_type rstride[GFC_MAX_DIMENSIONS];
48 /* s.* indicates the source array. */
49 index_type scount[GFC_MAX_DIMENSIONS];
50 index_type sextent[GFC_MAX_DIMENSIONS];
51 index_type sstride[GFC_MAX_DIMENSIONS];
56 /* p.* indicates the pad array. */
57 index_type pcount[GFC_MAX_DIMENSIONS];
58 index_type pextent[GFC_MAX_DIMENSIONS];
59 index_type pstride[GFC_MAX_DIMENSIONS];
67 int sempty, pempty, shape_empty;
68 index_type shape_data[GFC_MAX_DIMENSIONS];
70 rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1;
71 if (rdim != GFC_DESCRIPTOR_RANK(ret))
72 runtime_error("rank of return array incorrect in RESHAPE intrinsic");
76 for (n = 0; n < rdim; n++)
78 shape_data[n] = shape->data[n * shape->dim[0].stride];
79 if (shape_data[n] <= 0)
86 if (ret->data == NULL)
88 rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1;
90 for (n = 0; n < rdim; n++)
92 ret->dim[n].lbound = 0;
94 ret->dim[n].ubound = rex - 1;
95 ret->dim[n].stride = rs;
99 ret->data = internal_malloc_size ( rs * size );
100 ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rdim;
108 pdim = GFC_DESCRIPTOR_RANK (pad);
111 for (n = 0; n < pdim; n++)
114 pstride[n] = pad->dim[n].stride;
115 pextent[n] = pad->dim[n].ubound + 1 - pad->dim[n].lbound;
122 if (psize == pstride[n])
137 if (unlikely (compile_options.bounds_check))
139 index_type ret_extent, source_extent;
142 for (n = 0; n < rdim; n++)
145 ret_extent = ret->dim[n].ubound + 1 - ret->dim[n].lbound;
146 if (ret_extent != shape_data[n])
147 runtime_error("Incorrect extent in return value of RESHAPE"
148 " intrinsic in dimension %ld: is %ld,"
149 " should be %ld", (long int) n+1,
150 (long int) ret_extent, (long int) shape_data[n]);
154 sdim = GFC_DESCRIPTOR_RANK (source);
155 for (n = 0; n < sdim; n++)
158 se = source->dim[n].ubound + 1 - source->dim[0].lbound;
159 source_extent *= se > 0 ? se : 0;
162 if (rs > source_extent && (!pad || pempty))
163 runtime_error("Incorrect size in SOURCE argument to RESHAPE"
164 " intrinsic: is %ld, should be %ld",
165 (long int) source_extent, (long int) rs);
169 int seen[GFC_MAX_DIMENSIONS];
172 for (n = 0; n < rdim; n++)
175 for (n = 0; n < rdim; n++)
177 v = order->data[n * order->dim[0].stride] - 1;
179 if (v < 0 || v >= rdim)
180 runtime_error("Value %ld out of range in ORDER argument"
181 " to RESHAPE intrinsic", (long int) v + 1);
184 runtime_error("Duplicate value %ld in ORDER argument to"
185 " RESHAPE intrinsic", (long int) v + 1);
193 for (n = 0; n < rdim; n++)
196 dim = order->data[n * order->dim[0].stride] - 1;
201 rstride[n] = ret->dim[dim].stride;
202 rextent[n] = ret->dim[dim].ubound + 1 - ret->dim[dim].lbound;
204 if (rextent[n] != shape_data[dim])
205 runtime_error ("shape and target do not conform");
207 if (rsize == rstride[n])
215 sdim = GFC_DESCRIPTOR_RANK (source);
218 for (n = 0; n < sdim; n++)
221 sstride[n] = source->dim[n].stride;
222 sextent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
229 if (ssize == sstride[n])
235 if (rsize != 0 && ssize != 0 && psize != 0)
240 reshape_packed (ret->data, rsize, source->data, ssize,
241 pad ? pad->data : NULL, psize);
245 src = sptr = source->data;
246 rstride0 = rstride[0] * size;
247 sstride0 = sstride[0] * size;
249 if (sempty && pempty)
254 /* Pretend we are using the pad array the first time around, too. */
258 for (dim = 0; dim < pdim; dim++)
260 scount[dim] = pcount[dim];
261 sextent[dim] = pextent[dim];
262 sstride[dim] = pstride[dim];
263 sstride0 = pstride[0] * size;
269 /* Select between the source and pad arrays. */
270 memcpy(rptr, src, size);
271 /* Advance to the next element. */
277 /* Advance to the next destination element. */
279 while (rcount[n] == rextent[n])
281 /* When we get to the end of a dimension, reset it and increment
282 the next dimension. */
284 /* We could precalculate these products, but this is a less
285 frequently used path so probably not worth it. */
286 rptr -= rstride[n] * rextent[n] * size;
290 /* Break out of the loop. */
297 rptr += rstride[n] * size;
301 /* Advance to the next source element. */
303 while (scount[n] == sextent[n])
305 /* When we get to the end of a dimension, reset it and increment
306 the next dimension. */
308 /* We could precalculate these products, but this is a less
309 frequently used path so probably not worth it. */
310 src -= sstride[n] * sextent[n] * size;
316 /* Switch to the pad array. */
319 for (dim = 0; dim < pdim; dim++)
321 scount[dim] = pcount[dim];
322 sextent[dim] = pextent[dim];
323 sstride[dim] = pstride[dim];
324 sstride0 = sstride[0] * size;
327 /* We now start again from the beginning of the pad array. */
334 src += sstride[n] * size;
340 extern void reshape (parray *, parray *, shape_type *, parray *, shape_type *);
341 export_proto(reshape);
344 reshape (parray *ret, parray *source, shape_type *shape, parray *pad,
347 reshape_internal (ret, source, shape, pad, order,
348 GFC_DESCRIPTOR_SIZE (source));
352 extern void reshape_char (parray *, gfc_charlen_type, parray *, shape_type *,
353 parray *, shape_type *, gfc_charlen_type,
355 export_proto(reshape_char);
358 reshape_char (parray *ret, gfc_charlen_type ret_length __attribute__((unused)),
359 parray *source, shape_type *shape, parray *pad,
360 shape_type *order, gfc_charlen_type source_length,
361 gfc_charlen_type pad_length __attribute__((unused)))
363 reshape_internal (ret, source, shape, pad, order, source_length);
367 extern void reshape_char4 (parray *, gfc_charlen_type, parray *, shape_type *,
368 parray *, shape_type *, gfc_charlen_type,
370 export_proto(reshape_char4);
373 reshape_char4 (parray *ret, gfc_charlen_type ret_length __attribute__((unused)),
374 parray *source, shape_type *shape, parray *pad,
375 shape_type *order, gfc_charlen_type source_length,
376 gfc_charlen_type pad_length __attribute__((unused)))
378 reshape_internal (ret, source, shape, pad, order,
379 source_length * sizeof (gfc_char4_t));