1 /* 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 (libgfor).
7 Libgfor is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 Ligbfor 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 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with libgfor; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "libgfortran.h"
28 static const char zeros
[16] =
29 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
31 extern void eoshift1_8 (const gfc_array_char
*,
32 const gfc_array_char
*,
33 const gfc_array_i8
*, const char *,
34 const GFC_INTEGER_8
*);
35 export_proto(eoshift1_8
);
38 eoshift1_8 (const gfc_array_char
*ret
,
39 const gfc_array_char
*array
,
40 const gfc_array_i8
*h
, const char *pbound
,
41 const GFC_INTEGER_8
*pwhich
)
43 /* r.* indicates the return array. */
44 index_type rstride
[GFC_MAX_DIMENSIONS
- 1];
49 /* s.* indicates the source array. */
50 index_type sstride
[GFC_MAX_DIMENSIONS
- 1];
55 /* h.* indicates the shift array. */
56 index_type hstride
[GFC_MAX_DIMENSIONS
- 1];
58 const GFC_INTEGER_8
*hptr
;
60 index_type count
[GFC_MAX_DIMENSIONS
- 1];
61 index_type extent
[GFC_MAX_DIMENSIONS
- 1];
78 size
= GFC_DESCRIPTOR_SIZE (ret
);
82 size
= GFC_DESCRIPTOR_SIZE (array
);
84 for (dim
= 0; dim
< GFC_DESCRIPTOR_RANK (array
); dim
++)
88 roffset
= ret
->dim
[dim
].stride
* size
;
91 soffset
= array
->dim
[dim
].stride
* size
;
94 len
= array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
99 extent
[n
] = array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
100 rstride
[n
] = ret
->dim
[dim
].stride
* size
;
101 sstride
[n
] = array
->dim
[dim
].stride
* size
;
103 hstride
[n
] = h
->dim
[n
].stride
;
114 dim
= GFC_DESCRIPTOR_RANK (array
);
115 rstride0
= rstride
[0];
116 sstride0
= sstride
[0];
117 hstride0
= hstride
[0];
124 /* Do the shift for this dimension. */
126 delta
= (sh
>= 0) ? sh
: -sh
;
129 src
= &sptr
[delta
* soffset
];
135 dest
= &rptr
[delta
* roffset
];
137 for (n
= 0; n
< len
- delta
; n
++)
139 memcpy (dest
, src
, size
);
149 memcpy (dest
, pbound
, size
);
153 /* Advance to the next section. */
159 while (count
[n
] == extent
[n
])
161 /* When we get to the end of a dimension, reset it and increment
162 the next dimension. */
164 /* We could precalculate these products, but this is a less
165 frequently used path so proabably not worth it. */
166 rptr
-= rstride
[n
] * extent
[n
];
167 sptr
-= sstride
[n
] * extent
[n
];
168 hptr
-= hstride
[n
] * extent
[n
];
172 /* Break out of the loop. */