1 /* Generic implementation of the RESHAPE intrinsic
2 Copyright (C) 2002-2017 Free Software Foundation, Inc.
3 Contributed by Paul Brook <paul@nowt.org>
5 This file is part of the GNU Fortran 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"
29 typedef GFC_ARRAY_DESCRIPTOR(1, index_type
) shape_type
;
30 typedef GFC_ARRAY_DESCRIPTOR(GFC_MAX_DIMENSIONS
, char) parray
;
33 reshape_internal (parray
*ret
, parray
*source
, shape_type
*shape
,
34 parray
*pad
, shape_type
*order
, index_type size
)
36 /* r.* indicates the return array. */
37 index_type rcount
[GFC_MAX_DIMENSIONS
];
38 index_type rextent
[GFC_MAX_DIMENSIONS
];
39 index_type rstride
[GFC_MAX_DIMENSIONS
];
46 /* s.* indicates the source array. */
47 index_type scount
[GFC_MAX_DIMENSIONS
];
48 index_type sextent
[GFC_MAX_DIMENSIONS
];
49 index_type sstride
[GFC_MAX_DIMENSIONS
];
54 /* p.* indicates the pad array. */
55 index_type pcount
[GFC_MAX_DIMENSIONS
];
56 index_type pextent
[GFC_MAX_DIMENSIONS
];
57 index_type pstride
[GFC_MAX_DIMENSIONS
];
65 int sempty
, pempty
, shape_empty
;
66 index_type shape_data
[GFC_MAX_DIMENSIONS
];
68 rdim
= GFC_DESCRIPTOR_EXTENT(shape
,0);
69 /* rdim is always > 0; this lets the compiler optimize more and
71 GFC_ASSERT (rdim
> 0);
73 if (rdim
!= GFC_DESCRIPTOR_RANK(ret
))
74 runtime_error("rank of return array incorrect in RESHAPE intrinsic");
78 for (n
= 0; n
< rdim
; n
++)
80 shape_data
[n
] = shape
->base_addr
[n
* GFC_DESCRIPTOR_STRIDE(shape
,0)];
81 if (shape_data
[n
] <= 0)
88 if (ret
->base_addr
== NULL
)
90 index_type alloc_size
;
93 for (n
= 0; n
< rdim
; n
++)
97 GFC_DIMENSION_SET(ret
->dim
[n
],0,rex
- 1,rs
);
103 if (unlikely (rs
< 1))
104 alloc_size
= 0; /* xmalloc will allocate 1 byte. */
108 ret
->base_addr
= xmallocarray (alloc_size
, size
);
110 ret
->dtype
= (source
->dtype
& ~GFC_DTYPE_RANK_MASK
) | rdim
;
118 pdim
= GFC_DESCRIPTOR_RANK (pad
);
121 for (n
= 0; n
< pdim
; n
++)
124 pstride
[n
] = GFC_DESCRIPTOR_STRIDE(pad
,n
);
125 pextent
[n
] = GFC_DESCRIPTOR_EXTENT(pad
,n
);
132 if (psize
== pstride
[n
])
137 pptr
= pad
->base_addr
;
147 if (unlikely (compile_options
.bounds_check
))
149 index_type ret_extent
, source_extent
;
152 for (n
= 0; n
< rdim
; n
++)
155 ret_extent
= GFC_DESCRIPTOR_EXTENT(ret
,n
);
156 if (ret_extent
!= shape_data
[n
])
157 runtime_error("Incorrect extent in return value of RESHAPE"
158 " intrinsic in dimension %ld: is %ld,"
159 " should be %ld", (long int) n
+1,
160 (long int) ret_extent
, (long int) shape_data
[n
]);
164 sdim
= GFC_DESCRIPTOR_RANK (source
);
165 /* sdim is always > 0; this lets the compiler optimize more and
169 for (n
= 0; n
< sdim
; n
++)
172 se
= GFC_DESCRIPTOR_EXTENT(source
,n
);
173 source_extent
*= se
> 0 ? se
: 0;
176 if (rs
> source_extent
&& (!pad
|| pempty
))
177 runtime_error("Incorrect size in SOURCE argument to RESHAPE"
178 " intrinsic: is %ld, should be %ld",
179 (long int) source_extent
, (long int) rs
);
183 int seen
[GFC_MAX_DIMENSIONS
];
186 for (n
= 0; n
< rdim
; n
++)
189 for (n
= 0; n
< rdim
; n
++)
191 v
= order
->base_addr
[n
* GFC_DESCRIPTOR_STRIDE(order
,0)] - 1;
193 if (v
< 0 || v
>= rdim
)
194 runtime_error("Value %ld out of range in ORDER argument"
195 " to RESHAPE intrinsic", (long int) v
+ 1);
198 runtime_error("Duplicate value %ld in ORDER argument to"
199 " RESHAPE intrinsic", (long int) v
+ 1);
207 for (n
= 0; n
< rdim
; n
++)
210 dim
= order
->base_addr
[n
* GFC_DESCRIPTOR_STRIDE(order
,0)] - 1;
215 rstride
[n
] = GFC_DESCRIPTOR_STRIDE(ret
,dim
);
216 rextent
[n
] = GFC_DESCRIPTOR_EXTENT(ret
,dim
);
218 if (rextent
[n
] != shape_data
[dim
])
219 runtime_error ("shape and target do not conform");
221 if (rsize
== rstride
[n
])
229 sdim
= GFC_DESCRIPTOR_RANK (source
);
230 /* sdim is always > 0; this lets the compiler optimize more and
236 for (n
= 0; n
< sdim
; n
++)
239 sstride
[n
] = GFC_DESCRIPTOR_STRIDE(source
,n
);
240 sextent
[n
] = GFC_DESCRIPTOR_EXTENT(source
,n
);
247 if (ssize
== sstride
[n
])
253 if (rsize
!= 0 && ssize
!= 0 && psize
!= 0)
258 reshape_packed (ret
->base_addr
, rsize
, source
->base_addr
, ssize
,
259 pad
? pad
->base_addr
: NULL
, psize
);
262 rptr
= ret
->base_addr
;
263 src
= sptr
= source
->base_addr
;
264 rstride0
= rstride
[0] * size
;
265 sstride0
= sstride
[0] * size
;
267 if (sempty
&& pempty
)
272 /* Pretend we are using the pad array the first time around, too. */
276 for (dim
= 0; dim
< pdim
; dim
++)
278 scount
[dim
] = pcount
[dim
];
279 sextent
[dim
] = pextent
[dim
];
280 sstride
[dim
] = pstride
[dim
];
281 sstride0
= pstride
[0] * size
;
287 /* Select between the source and pad arrays. */
288 memcpy(rptr
, src
, size
);
289 /* Advance to the next element. */
295 /* Advance to the next destination element. */
297 while (rcount
[n
] == rextent
[n
])
299 /* When we get to the end of a dimension, reset it and increment
300 the next dimension. */
302 /* We could precalculate these products, but this is a less
303 frequently used path so probably not worth it. */
304 rptr
-= rstride
[n
] * rextent
[n
] * size
;
308 /* Break out of the loop. */
315 rptr
+= rstride
[n
] * size
;
319 /* Advance to the next source element. */
321 while (scount
[n
] == sextent
[n
])
323 /* When we get to the end of a dimension, reset it and increment
324 the next dimension. */
326 /* We could precalculate these products, but this is a less
327 frequently used path so probably not worth it. */
328 src
-= sstride
[n
] * sextent
[n
] * size
;
334 /* Switch to the pad array. */
337 for (dim
= 0; dim
< pdim
; dim
++)
339 scount
[dim
] = pcount
[dim
];
340 sextent
[dim
] = pextent
[dim
];
341 sstride
[dim
] = pstride
[dim
];
342 sstride0
= sstride
[0] * size
;
345 /* We now start again from the beginning of the pad array. */
352 src
+= sstride
[n
] * size
;
358 extern void reshape (parray
*, parray
*, shape_type
*, parray
*, shape_type
*);
359 export_proto(reshape
);
362 reshape (parray
*ret
, parray
*source
, shape_type
*shape
, parray
*pad
,
365 reshape_internal (ret
, source
, shape
, pad
, order
,
366 GFC_DESCRIPTOR_SIZE (source
));
370 extern void reshape_char (parray
*, gfc_charlen_type
, parray
*, shape_type
*,
371 parray
*, shape_type
*, gfc_charlen_type
,
373 export_proto(reshape_char
);
376 reshape_char (parray
*ret
, gfc_charlen_type ret_length
__attribute__((unused
)),
377 parray
*source
, shape_type
*shape
, parray
*pad
,
378 shape_type
*order
, gfc_charlen_type source_length
,
379 gfc_charlen_type pad_length
__attribute__((unused
)))
381 reshape_internal (ret
, source
, shape
, pad
, order
, source_length
);
385 extern void reshape_char4 (parray
*, gfc_charlen_type
, parray
*, shape_type
*,
386 parray
*, shape_type
*, gfc_charlen_type
,
388 export_proto(reshape_char4
);
391 reshape_char4 (parray
*ret
, gfc_charlen_type ret_length
__attribute__((unused
)),
392 parray
*source
, shape_type
*shape
, parray
*pad
,
393 shape_type
*order
, gfc_charlen_type source_length
,
394 gfc_charlen_type pad_length
__attribute__((unused
)))
396 reshape_internal (ret
, source
, shape
, pad
, order
,
397 source_length
* sizeof (gfc_char4_t
));