1 /* Implementation of the CSHIFT intrinsic
2 Copyright 2003 Free Software Foundation, Inc.
3 Contributed by Feng Wang <wf_cs@yahoo.com>
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. */
35 #include "libgfortran.h"
37 #if defined (HAVE_GFC_INTEGER_4)
40 cshift1 (gfc_array_char
* const restrict ret
,
41 const gfc_array_char
* const restrict array
,
42 const gfc_array_i4
* const restrict h
,
43 const GFC_INTEGER_4
* const restrict pwhich
,
46 /* r.* indicates the return array. */
47 index_type rstride
[GFC_MAX_DIMENSIONS
];
52 /* s.* indicates the source array. */
53 index_type sstride
[GFC_MAX_DIMENSIONS
];
58 /* h.* indicates the shift array. */
59 index_type hstride
[GFC_MAX_DIMENSIONS
];
61 const GFC_INTEGER_4
*hptr
;
63 index_type count
[GFC_MAX_DIMENSIONS
];
64 index_type extent
[GFC_MAX_DIMENSIONS
];
76 if (which
< 0 || (which
+ 1) > GFC_DESCRIPTOR_RANK (array
))
77 runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
79 if (ret
->data
== NULL
)
83 ret
->data
= internal_malloc_size (size
* size0 ((array_t
*)array
));
85 ret
->dtype
= array
->dtype
;
86 for (i
= 0; i
< GFC_DESCRIPTOR_RANK (array
); i
++)
88 ret
->dim
[i
].lbound
= 0;
89 ret
->dim
[i
].ubound
= array
->dim
[i
].ubound
- array
->dim
[i
].lbound
;
92 ret
->dim
[i
].stride
= 1;
94 ret
->dim
[i
].stride
= (ret
->dim
[i
-1].ubound
+ 1) * ret
->dim
[i
-1].stride
;
102 /* Initialized for avoiding compiler warnings. */
107 for (dim
= 0; dim
< GFC_DESCRIPTOR_RANK (array
); dim
++)
111 roffset
= ret
->dim
[dim
].stride
* size
;
114 soffset
= array
->dim
[dim
].stride
* size
;
117 len
= array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
122 extent
[n
] = array
->dim
[dim
].ubound
+ 1 - array
->dim
[dim
].lbound
;
123 rstride
[n
] = ret
->dim
[dim
].stride
* size
;
124 sstride
[n
] = array
->dim
[dim
].stride
* size
;
126 hstride
[n
] = h
->dim
[n
].stride
;
137 dim
= GFC_DESCRIPTOR_RANK (array
);
138 rstride0
= rstride
[0];
139 sstride0
= sstride
[0];
140 hstride0
= hstride
[0];
147 /* Do the shift for this dimension. */
149 sh
= (div (sh
, len
)).rem
;
153 src
= &sptr
[sh
* soffset
];
156 for (n
= 0; n
< len
; n
++)
158 memcpy (dest
, src
, size
);
160 if (n
== len
- sh
- 1)
166 /* Advance to the next section. */
172 while (count
[n
] == extent
[n
])
174 /* When we get to the end of a dimension, reset it and increment
175 the next dimension. */
177 /* We could precalculate these products, but this is a less
178 frequently used path so probably not worth it. */
179 rptr
-= rstride
[n
] * extent
[n
];
180 sptr
-= sstride
[n
] * extent
[n
];
181 hptr
-= hstride
[n
] * extent
[n
];
185 /* Break out of the loop. */
200 void cshift1_4 (gfc_array_char
* const restrict
,
201 const gfc_array_char
* const restrict
,
202 const gfc_array_i4
* const restrict
,
203 const GFC_INTEGER_4
* const restrict
);
204 export_proto(cshift1_4
);
207 cshift1_4 (gfc_array_char
* const restrict ret
,
208 const gfc_array_char
* const restrict array
,
209 const gfc_array_i4
* const restrict h
,
210 const GFC_INTEGER_4
* const restrict pwhich
)
212 cshift1 (ret
, array
, h
, pwhich
, GFC_DESCRIPTOR_SIZE (array
));
215 void cshift1_4_char (gfc_array_char
* const restrict ret
,
217 const gfc_array_char
* const restrict array
,
218 const gfc_array_i4
* const restrict h
,
219 const GFC_INTEGER_4
* const restrict pwhich
,
221 export_proto(cshift1_4_char
);
224 cshift1_4_char (gfc_array_char
* const restrict ret
,
225 GFC_INTEGER_4 ret_length
__attribute__((unused
)),
226 const gfc_array_char
* const restrict array
,
227 const gfc_array_i4
* const restrict h
,
228 const GFC_INTEGER_4
* const restrict pwhich
,
229 GFC_INTEGER_4 array_length
)
231 cshift1 (ret
, array
, h
, pwhich
, array_length
);