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1 | /* Implementation of the RESHAPE |
2 | Copyright 2002, 2006 Free Software Foundation, Inc. | |
3 | Contributed by Paul Brook <paul@nowt.org> | |
4 | ||
5 | This file is part of the GNU Fortran 95 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 2 of the License, or (at your option) any later version. | |
11 | ||
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 | |
19 | executable.) | |
20 | ||
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. | |
25 | ||
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. */ | |
30 | ||
31 | #include "config.h" | |
32 | #include <stdlib.h> | |
33 | #include <assert.h> | |
34 | #include "libgfortran.h" | |
35 | ||
36 | #if defined (HAVE_GFC_REAL_4) | |
37 | ||
38 | typedef GFC_ARRAY_DESCRIPTOR(1, index_type) shape_type; | |
39 | ||
40 | /* The shape parameter is ignored. We can currently deduce the shape from the | |
41 | return array. */ | |
42 | ||
43 | extern void reshape_r4 (gfc_array_r4 * const restrict, | |
44 | gfc_array_r4 * const restrict, | |
45 | shape_type * const restrict, | |
46 | gfc_array_r4 * const restrict, | |
47 | shape_type * const restrict); | |
48 | export_proto(reshape_r4); | |
49 | ||
50 | void | |
51 | reshape_r4 (gfc_array_r4 * const restrict ret, | |
52 | gfc_array_r4 * const restrict source, | |
53 | shape_type * const restrict shape, | |
54 | gfc_array_r4 * const restrict pad, | |
55 | shape_type * const restrict order) | |
56 | { | |
57 | /* r.* indicates the return array. */ | |
58 | index_type rcount[GFC_MAX_DIMENSIONS]; | |
59 | index_type rextent[GFC_MAX_DIMENSIONS]; | |
60 | index_type rstride[GFC_MAX_DIMENSIONS]; | |
61 | index_type rstride0; | |
62 | index_type rdim; | |
63 | index_type rsize; | |
64 | index_type rs; | |
65 | index_type rex; | |
66 | GFC_REAL_4 *rptr; | |
67 | /* s.* indicates the source array. */ | |
68 | index_type scount[GFC_MAX_DIMENSIONS]; | |
69 | index_type sextent[GFC_MAX_DIMENSIONS]; | |
70 | index_type sstride[GFC_MAX_DIMENSIONS]; | |
71 | index_type sstride0; | |
72 | index_type sdim; | |
73 | index_type ssize; | |
74 | const GFC_REAL_4 *sptr; | |
75 | /* p.* indicates the pad array. */ | |
76 | index_type pcount[GFC_MAX_DIMENSIONS]; | |
77 | index_type pextent[GFC_MAX_DIMENSIONS]; | |
78 | index_type pstride[GFC_MAX_DIMENSIONS]; | |
79 | index_type pdim; | |
80 | index_type psize; | |
81 | const GFC_REAL_4 *pptr; | |
82 | ||
83 | const GFC_REAL_4 *src; | |
84 | int n; | |
85 | int dim; | |
86 | ||
87 | if (ret->data == NULL) | |
88 | { | |
89 | rdim = shape->dim[0].ubound - shape->dim[0].lbound + 1; | |
90 | rs = 1; | |
91 | for (n=0; n < rdim; n++) | |
92 | { | |
93 | ret->dim[n].lbound = 0; | |
94 | rex = shape->data[n * shape->dim[0].stride]; | |
95 | ret->dim[n].ubound = rex - 1; | |
96 | ret->dim[n].stride = rs; | |
97 | rs *= rex; | |
98 | } | |
99 | ret->offset = 0; | |
100 | ret->data = internal_malloc_size ( rs * sizeof (GFC_REAL_4)); | |
101 | ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rdim; | |
102 | } | |
103 | else | |
104 | { | |
105 | rdim = GFC_DESCRIPTOR_RANK (ret); | |
106 | } | |
107 | ||
108 | rsize = 1; | |
109 | for (n = 0; n < rdim; n++) | |
110 | { | |
111 | if (order) | |
112 | dim = order->data[n * order->dim[0].stride] - 1; | |
113 | else | |
114 | dim = n; | |
115 | ||
116 | rcount[n] = 0; | |
117 | rstride[n] = ret->dim[dim].stride; | |
118 | rextent[n] = ret->dim[dim].ubound + 1 - ret->dim[dim].lbound; | |
119 | ||
120 | if (rextent[n] != shape->data[dim * shape->dim[0].stride]) | |
121 | runtime_error ("shape and target do not conform"); | |
122 | ||
123 | if (rsize == rstride[n]) | |
124 | rsize *= rextent[n]; | |
125 | else | |
126 | rsize = 0; | |
127 | if (rextent[n] <= 0) | |
128 | return; | |
129 | } | |
130 | ||
131 | sdim = GFC_DESCRIPTOR_RANK (source); | |
132 | ssize = 1; | |
133 | for (n = 0; n < sdim; n++) | |
134 | { | |
135 | scount[n] = 0; | |
136 | sstride[n] = source->dim[n].stride; | |
137 | sextent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound; | |
138 | if (sextent[n] <= 0) | |
139 | abort (); | |
140 | ||
141 | if (ssize == sstride[n]) | |
142 | ssize *= sextent[n]; | |
143 | else | |
144 | ssize = 0; | |
145 | } | |
146 | ||
147 | if (pad) | |
148 | { | |
149 | pdim = GFC_DESCRIPTOR_RANK (pad); | |
150 | psize = 1; | |
151 | for (n = 0; n < pdim; n++) | |
152 | { | |
153 | pcount[n] = 0; | |
154 | pstride[n] = pad->dim[n].stride; | |
155 | pextent[n] = pad->dim[n].ubound + 1 - pad->dim[n].lbound; | |
156 | if (pextent[n] <= 0) | |
157 | abort (); | |
158 | if (psize == pstride[n]) | |
159 | psize *= pextent[n]; | |
160 | else | |
161 | psize = 0; | |
162 | } | |
163 | pptr = pad->data; | |
164 | } | |
165 | else | |
166 | { | |
167 | pdim = 0; | |
168 | psize = 1; | |
169 | pptr = NULL; | |
170 | } | |
171 | ||
172 | if (rsize != 0 && ssize != 0 && psize != 0) | |
173 | { | |
174 | rsize *= sizeof (GFC_REAL_4); | |
175 | ssize *= sizeof (GFC_REAL_4); | |
176 | psize *= sizeof (GFC_REAL_4); | |
177 | reshape_packed ((char *)ret->data, rsize, (char *)source->data, | |
178 | ssize, pad ? (char *)pad->data : NULL, psize); | |
179 | return; | |
180 | } | |
181 | rptr = ret->data; | |
182 | src = sptr = source->data; | |
183 | rstride0 = rstride[0]; | |
184 | sstride0 = sstride[0]; | |
185 | ||
186 | while (rptr) | |
187 | { | |
188 | /* Select between the source and pad arrays. */ | |
189 | *rptr = *src; | |
190 | /* Advance to the next element. */ | |
191 | rptr += rstride0; | |
192 | src += sstride0; | |
193 | rcount[0]++; | |
194 | scount[0]++; | |
195 | /* Advance to the next destination element. */ | |
196 | n = 0; | |
197 | while (rcount[n] == rextent[n]) | |
198 | { | |
199 | /* When we get to the end of a dimension, reset it and increment | |
200 | the next dimension. */ | |
201 | rcount[n] = 0; | |
202 | /* We could precalculate these products, but this is a less | |
5d7adf7a | 203 | frequently used path so probably not worth it. */ |
ecebfb8b FXC |
204 | rptr -= rstride[n] * rextent[n]; |
205 | n++; | |
206 | if (n == rdim) | |
207 | { | |
208 | /* Break out of the loop. */ | |
209 | rptr = NULL; | |
210 | break; | |
211 | } | |
212 | else | |
213 | { | |
214 | rcount[n]++; | |
215 | rptr += rstride[n]; | |
216 | } | |
217 | } | |
218 | /* Advance to the next source element. */ | |
219 | n = 0; | |
220 | while (scount[n] == sextent[n]) | |
221 | { | |
222 | /* When we get to the end of a dimension, reset it and increment | |
223 | the next dimension. */ | |
224 | scount[n] = 0; | |
225 | /* We could precalculate these products, but this is a less | |
5d7adf7a | 226 | frequently used path so probably not worth it. */ |
ecebfb8b FXC |
227 | src -= sstride[n] * sextent[n]; |
228 | n++; | |
229 | if (n == sdim) | |
230 | { | |
231 | if (sptr && pad) | |
232 | { | |
233 | /* Switch to the pad array. */ | |
234 | sptr = NULL; | |
235 | sdim = pdim; | |
236 | for (dim = 0; dim < pdim; dim++) | |
237 | { | |
238 | scount[dim] = pcount[dim]; | |
239 | sextent[dim] = pextent[dim]; | |
240 | sstride[dim] = pstride[dim]; | |
241 | sstride0 = sstride[0]; | |
242 | } | |
243 | } | |
244 | /* We now start again from the beginning of the pad array. */ | |
245 | src = pptr; | |
246 | break; | |
247 | } | |
248 | else | |
249 | { | |
250 | scount[n]++; | |
251 | src += sstride[n]; | |
252 | } | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
257 | #endif |