1 /* Generic implementation of the EOSHIFT intrinsic
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 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., 59 Temple Place - Suite 330,
29 Boston, MA 02111-1307, USA. */
35 #include "libgfortran.h"
37 static const char zeros
[16] =
38 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
40 /* TODO: make this work for large shifts when
41 sizeof(int) < sizeof (index_type). */
44 eoshift2 (gfc_array_char
*ret
, const gfc_array_char
*array
,
45 int shift
, const gfc_array_char
*bound
, int which
)
47 /* r.* indicates the return array. */
48 index_type rstride
[GFC_MAX_DIMENSIONS
- 1];
53 /* s.* indicates the source array. */
54 index_type sstride
[GFC_MAX_DIMENSIONS
- 1];
59 /* b.* indicates the bound array. */
60 index_type bstride
[GFC_MAX_DIMENSIONS
- 1];
64 index_type count
[GFC_MAX_DIMENSIONS
- 1];
65 index_type extent
[GFC_MAX_DIMENSIONS
- 1];
71 size
= GFC_DESCRIPTOR_SIZE (ret
);
73 if (ret
->data
== NULL
)
77 ret
->data
= internal_malloc_size (size
* size0 ((array_t
*)array
));
79 ret
->dtype
= array
->dtype
;
80 for (i
= 0; i
< GFC_DESCRIPTOR_RANK (array
); i
++)
82 ret
->dim
[i
].lbound
= 0;
83 ret
->dim
[i
].ubound
= array
->dim
[i
].ubound
- array
->dim
[i
].lbound
;
86 ret
->dim
[i
].stride
= 1;
88 ret
->dim
[i
].stride
= (ret
->dim
[i
-1].ubound
+ 1) * ret
->dim
[i
-1].stride
;
96 size
= GFC_DESCRIPTOR_SIZE (array
);
98 for (dim
= 0; dim
< GFC_DESCRIPTOR_RANK (array
); dim
++)
102 roffset
= ret
->dim
[dim
].stride
* size
;
105 soffset
= array
->dim
[dim
].stride
* size
;
108 len
= array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
113 extent
[n
] = array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
114 rstride
[n
] = ret
->dim
[dim
].stride
* size
;
115 sstride
[n
] = array
->dim
[dim
].stride
* size
;
117 bstride
[n
] = bound
->dim
[n
].stride
* size
;
127 if (bound
&& bstride
[0] == 0)
130 dim
= GFC_DESCRIPTOR_RANK (array
);
131 rstride0
= rstride
[0];
132 sstride0
= sstride
[0];
133 bstride0
= bstride
[0];
148 /* Do the shift for this dimension. */
151 src
= &sptr
[shift
* soffset
];
157 dest
= &rptr
[-shift
* roffset
];
159 for (n
= 0; n
< len
; n
++)
161 memcpy (dest
, src
, size
);
177 memcpy (dest
, bptr
, size
);
181 /* Advance to the next section. */
187 while (count
[n
] == extent
[n
])
189 /* When we get to the end of a dimension, reset it and increment
190 the next dimension. */
192 /* We could precalculate these products, but this is a less
193 frequently used path so proabably not worth it. */
194 rptr
-= rstride
[n
] * extent
[n
];
195 sptr
-= sstride
[n
] * extent
[n
];
196 bptr
-= bstride
[n
] * extent
[n
];
200 /* Break out of the loop. */
216 extern void eoshift2_1 (gfc_array_char
*, const gfc_array_char
*,
217 const GFC_INTEGER_1
*, const gfc_array_char
*,
218 const GFC_INTEGER_1
*);
219 export_proto(eoshift2_1
);
222 eoshift2_1 (gfc_array_char
*ret
, const gfc_array_char
*array
,
223 const GFC_INTEGER_1
*pshift
, const gfc_array_char
*bound
,
224 const GFC_INTEGER_1
*pdim
)
226 eoshift2 (ret
, array
, *pshift
, bound
, pdim
? *pdim
: 1);
230 extern void eoshift2_2 (gfc_array_char
*, const gfc_array_char
*,
231 const GFC_INTEGER_2
*, const gfc_array_char
*,
232 const GFC_INTEGER_2
*);
233 export_proto(eoshift2_2
);
236 eoshift2_2 (gfc_array_char
*ret
, const gfc_array_char
*array
,
237 const GFC_INTEGER_2
*pshift
, const gfc_array_char
*bound
,
238 const GFC_INTEGER_2
*pdim
)
240 eoshift2 (ret
, array
, *pshift
, bound
, pdim
? *pdim
: 1);
244 extern void eoshift2_4 (gfc_array_char
*, const gfc_array_char
*,
245 const GFC_INTEGER_4
*, const gfc_array_char
*,
246 const GFC_INTEGER_4
*);
247 export_proto(eoshift2_4
);
250 eoshift2_4 (gfc_array_char
*ret
, const gfc_array_char
*array
,
251 const GFC_INTEGER_4
*pshift
, const gfc_array_char
*bound
,
252 const GFC_INTEGER_4
*pdim
)
254 eoshift2 (ret
, array
, *pshift
, bound
, pdim
? *pdim
: 1);
258 extern void eoshift2_8 (gfc_array_char
*, const gfc_array_char
*,
259 const GFC_INTEGER_8
*, const gfc_array_char
*,
260 const GFC_INTEGER_8
*);
261 export_proto(eoshift2_8
);
264 eoshift2_8 (gfc_array_char
*ret
, const gfc_array_char
*array
,
265 const GFC_INTEGER_8
*pshift
, const gfc_array_char
*bound
,
266 const GFC_INTEGER_8
*pdim
)
268 eoshift2 (ret
, array
, *pshift
, bound
, pdim
? *pdim
: 1);