1 `/* Implementation of the RESHAPE
2 Copyright 2002 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 Libgfortran 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. */
34 #include "libgfortran.h"'
37 `#if defined (HAVE_'rtype_name`)'
39 typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type;
41 /* The shape parameter is ignored. We can currently deduce the shape from the
43 dnl Only the kind (ie size) is used to name the function.
45 extern void reshape_`'rtype_ccode (rtype * const restrict,
46 rtype * const restrict,
47 shape_type * const restrict,
48 rtype * const restrict,
49 shape_type * const restrict);
50 export_proto(reshape_`'rtype_ccode);
53 reshape_`'rtype_ccode (rtype * const restrict ret,
54 rtype * const restrict source,
55 shape_type * const restrict shape,
56 rtype * const restrict pad,
57 shape_type * const restrict order)
59 /* r.* indicates the return array. */
60 index_type rcount[GFC_MAX_DIMENSIONS];
61 index_type rextent[GFC_MAX_DIMENSIONS];
62 index_type rstride[GFC_MAX_DIMENSIONS];
69 /* s.* indicates the source array. */
70 index_type scount[GFC_MAX_DIMENSIONS];
71 index_type sextent[GFC_MAX_DIMENSIONS];
72 index_type sstride[GFC_MAX_DIMENSIONS];
76 const rtype_name *sptr;
77 /* p.* indicates the pad array. */
78 index_type pcount[GFC_MAX_DIMENSIONS];
79 index_type pextent[GFC_MAX_DIMENSIONS];
80 index_type pstride[GFC_MAX_DIMENSIONS];
83 const rtype_name *pptr;
85 const rtype_name *src;
89 if (source->dim[0].stride == 0)
90 source->dim[0].stride = 1;
91 if (shape->dim[0].stride == 0)
92 shape->dim[0].stride = 1;
93 if (pad && pad->dim[0].stride == 0)
94 pad->dim[0].stride = 1;
95 if (order && order->dim[0].stride == 0)
96 order->dim[0].stride = 1;
98 if (ret->data == NULL)
100 rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1;
102 for (n=0; n < rdim; n++)
104 ret->dim[n].lbound = 0;
105 rex = shape->data[n * shape->dim[0].stride];
106 ret->dim[n].ubound = rex - 1;
107 ret->dim[n].stride = rs;
111 ret->data = internal_malloc_size ( rs * sizeof (rtype_name));
112 ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rdim;
116 rdim = GFC_DESCRIPTOR_RANK (ret);
117 if (ret->dim[0].stride == 0)
118 ret->dim[0].stride = 1;
122 for (n = 0; n < rdim; n++)
125 dim = order->data[n * order->dim[0].stride] - 1;
130 rstride[n] = ret->dim[dim].stride;
131 rextent[n] = ret->dim[dim].ubound + 1 - ret->dim[dim].lbound;
133 if (rextent[n] != shape->data[dim * shape->dim[0].stride])
134 runtime_error ("shape and target do not conform");
136 if (rsize == rstride[n])
144 sdim = GFC_DESCRIPTOR_RANK (source);
146 for (n = 0; n < sdim; n++)
149 sstride[n] = source->dim[n].stride;
150 sextent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound;
154 if (ssize == sstride[n])
162 pdim = GFC_DESCRIPTOR_RANK (pad);
164 for (n = 0; n < pdim; n++)
167 pstride[n] = pad->dim[n].stride;
168 pextent[n] = pad->dim[n].ubound + 1 - pad->dim[n].lbound;
171 if (psize == pstride[n])
185 if (rsize != 0 && ssize != 0 && psize != 0)
187 rsize *= sizeof (rtype_name);
188 ssize *= sizeof (rtype_name);
189 psize *= sizeof (rtype_name);
190 reshape_packed ((char *)ret->data, rsize, (char *)source->data,
191 ssize, pad ? (char *)pad->data : NULL, psize);
195 src = sptr = source->data;
196 rstride0 = rstride[0];
197 sstride0 = sstride[0];
201 /* Select between the source and pad arrays. */
203 /* Advance to the next element. */
208 /* Advance to the next destination element. */
210 while (rcount[n] == rextent[n])
212 /* When we get to the end of a dimension, reset it and increment
213 the next dimension. */
215 /* We could precalculate these products, but this is a less
216 frequently used path so proabably not worth it. */
217 rptr -= rstride[n] * rextent[n];
221 /* Break out of the loop. */
231 /* Advance to the next source element. */
233 while (scount[n] == sextent[n])
235 /* When we get to the end of a dimension, reset it and increment
236 the next dimension. */
238 /* We could precalculate these products, but this is a less
239 frequently used path so proabably not worth it. */
240 src -= sstride[n] * sextent[n];
246 /* Switch to the pad array. */
249 for (dim = 0; dim < pdim; dim++)
251 scount[dim] = pcount[dim];
252 sextent[dim] = pextent[dim];
253 sstride[dim] = pstride[dim];
254 sstride0 = sstride[0];
257 /* We now start again from the beginning of the pad array. */