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};
32 __eoshift3_4 (gfc_array_char
* ret
, gfc_array_char
* array
,
33 gfc_array_i4
* h
, const gfc_array_char
* bound
, GFC_INTEGER_4
* pwhich
)
35 /* r.* indicates the return array. */
36 index_type rstride
[GFC_MAX_DIMENSIONS
- 1];
41 /* s.* indicates the source array. */
42 index_type sstride
[GFC_MAX_DIMENSIONS
- 1];
47 /* h.* indicates the shift array. */
48 index_type hstride
[GFC_MAX_DIMENSIONS
- 1];
50 const GFC_INTEGER_4
*hptr
;
51 /* b.* indicates the bound array. */
52 index_type bstride
[GFC_MAX_DIMENSIONS
- 1];
56 index_type count
[GFC_MAX_DIMENSIONS
- 1];
57 index_type extent
[GFC_MAX_DIMENSIONS
- 1];
71 size
= GFC_DESCRIPTOR_SIZE (ret
);
75 size
= GFC_DESCRIPTOR_SIZE (array
);
77 for (dim
= 0; dim
< GFC_DESCRIPTOR_RANK (array
); dim
++)
81 roffset
= ret
->dim
[dim
].stride
* size
;
84 soffset
= array
->dim
[dim
].stride
* size
;
87 len
= array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
92 extent
[n
] = array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
93 rstride
[n
] = ret
->dim
[dim
].stride
* size
;
94 sstride
[n
] = array
->dim
[dim
].stride
* size
;
96 hstride
[n
] = h
->dim
[n
].stride
;
98 bstride
[n
] = bound
->dim
[n
].stride
;
110 if (bound
&& bstride
[0] == 0)
113 dim
= GFC_DESCRIPTOR_RANK (array
);
114 rstride0
= rstride
[0];
115 sstride0
= sstride
[0];
116 hstride0
= hstride
[0];
117 bstride0
= bstride
[0];
128 /* Do the shift for this dimension. */
130 delta
= (sh
>= 0) ? sh
: -sh
;
133 src
= &sptr
[delta
* soffset
];
139 dest
= &rptr
[delta
* roffset
];
141 for (n
= 0; n
< len
- delta
; n
++)
143 memcpy (dest
, src
, size
);
153 memcpy (dest
, bptr
, size
);
157 /* Advance to the next section. */
164 while (count
[n
] == extent
[n
])
166 /* When we get to the end of a dimension, reset it and increment
167 the next dimension. */
169 /* We could precalculate these products, but this is a less
170 frequently used path so proabably not worth it. */
171 rptr
-= rstride
[n
] * extent
[n
];
172 sptr
-= sstride
[n
] * extent
[n
];
173 hptr
-= hstride
[n
] * extent
[n
];
174 bptr
-= bstride
[n
] * extent
[n
];
178 /* Break out of the loop. */