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
;
112 for (n
= 0; n
< rdim
; n
++)
115 dim
= order
->data
[n
* order
->dim
[0].stride
] - 1;
120 rstride
[n
] = ret
->dim
[dim
].stride
;
121 rextent
[n
] = ret
->dim
[dim
].ubound
+ 1 - ret
->dim
[dim
].lbound
;
123 if (rextent
[n
] != shape_data
[dim
])
124 runtime_error ("shape and target do not conform");
126 if (rsize
== rstride
[n
])
134 sdim
= GFC_DESCRIPTOR_RANK (source
);
137 for (n
= 0; n
< sdim
; n
++)
140 sstride
[n
] = source
->dim
[n
].stride
;
141 sextent
[n
] = source
->dim
[n
].ubound
+ 1 - source
->dim
[n
].lbound
;
148 if (ssize
== sstride
[n
])
156 pdim
= GFC_DESCRIPTOR_RANK (pad
);
159 for (n
= 0; n
< pdim
; n
++)
162 pstride
[n
] = pad
->dim
[n
].stride
;
163 pextent
[n
] = pad
->dim
[n
].ubound
+ 1 - pad
->dim
[n
].lbound
;
170 if (psize
== pstride
[n
])
185 if (rsize
!= 0 && ssize
!= 0 && psize
!= 0)
190 reshape_packed (ret
->data
, rsize
, source
->data
, ssize
,
191 pad
? pad
->data
: NULL
, psize
);
195 src
= sptr
= source
->data
;
196 rstride0
= rstride
[0] * size
;
197 sstride0
= sstride
[0] * size
;
199 if (sempty
&& pempty
)
204 /* Switch immediately to the pad array. */
208 for (dim
= 0; dim
< pdim
; dim
++)
210 scount
[dim
] = pcount
[dim
];
211 sextent
[dim
] = pextent
[dim
];
212 sstride
[dim
] = pstride
[dim
];
213 sstride0
= sstride
[0] * size
;
219 /* Select between the source and pad arrays. */
220 memcpy(rptr
, src
, size
);
221 /* Advance to the next element. */
227 /* Advance to the next destination element. */
229 while (rcount
[n
] == rextent
[n
])
231 /* When we get to the end of a dimension, reset it and increment
232 the next dimension. */
234 /* We could precalculate these products, but this is a less
235 frequently used path so probably not worth it. */
236 rptr
-= rstride
[n
] * rextent
[n
] * size
;
240 /* Break out of the loop. */
247 rptr
+= rstride
[n
] * size
;
251 /* Advance to the next source element. */
253 while (scount
[n
] == sextent
[n
])
255 /* When we get to the end of a dimension, reset it and increment
256 the next dimension. */
258 /* We could precalculate these products, but this is a less
259 frequently used path so probably not worth it. */
260 src
-= sstride
[n
] * sextent
[n
] * size
;
266 /* Switch to the pad array. */
269 for (dim
= 0; dim
< pdim
; dim
++)
271 scount
[dim
] = pcount
[dim
];
272 sextent
[dim
] = pextent
[dim
];
273 sstride
[dim
] = pstride
[dim
];
274 sstride0
= sstride
[0] * size
;
277 /* We now start again from the beginning of the pad array. */
284 src
+= sstride
[n
] * size
;
290 extern void reshape (parray
*, parray
*, shape_type
*, parray
*, shape_type
*);
291 export_proto(reshape
);
294 reshape (parray
*ret
, parray
*source
, shape_type
*shape
, parray
*pad
,
297 reshape_internal (ret
, source
, shape
, pad
, order
,
298 GFC_DESCRIPTOR_SIZE (source
));
301 extern void reshape_char (parray
*, GFC_INTEGER_4
, parray
*, shape_type
*,
302 parray
*, shape_type
*, GFC_INTEGER_4
,
304 export_proto(reshape_char
);
307 reshape_char (parray
*ret
, GFC_INTEGER_4 ret_length
__attribute__((unused
)),
308 parray
*source
, shape_type
*shape
, parray
*pad
,
309 shape_type
*order
, GFC_INTEGER_4 source_length
,
310 GFC_INTEGER_4 pad_length
__attribute__((unused
)))
312 reshape_internal (ret
, source
, shape
, pad
, order
, source_length
);