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"'
39 cshift1 (gfc_array_char * ret, const gfc_array_char * array,
40 const atype * h, const atype_name * pwhich, index_type size)
42 /* r.* indicates the return array. */
43 index_type rstride[GFC_MAX_DIMENSIONS];
48 /* s.* indicates the source array. */
49 index_type sstride[GFC_MAX_DIMENSIONS];
54 /* h.* indicates the shift array. */
55 index_type hstride[GFC_MAX_DIMENSIONS];
57 const atype_name *hptr;
59 index_type count[GFC_MAX_DIMENSIONS];
60 index_type extent[GFC_MAX_DIMENSIONS];
72 if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
73 runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
75 if (ret->data == NULL)
79 ret->data = internal_malloc_size (size * size0 ((array_t *)array));
81 ret->dtype = array->dtype;
82 for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
84 ret->dim[i].lbound = 0;
85 ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
88 ret->dim[i].stride = 1;
90 ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
98 /* Initialized for avoiding compiler warnings. */
103 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
107 roffset = ret->dim[dim].stride * size;
110 soffset = array->dim[dim].stride * size;
113 len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
118 extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
119 rstride[n] = ret->dim[dim].stride * size;
120 sstride[n] = array->dim[dim].stride * size;
122 hstride[n] = h->dim[n].stride;
133 dim = GFC_DESCRIPTOR_RANK (array);
134 rstride0 = rstride[0];
135 sstride0 = sstride[0];
136 hstride0 = hstride[0];
143 /* Do the shift for this dimension. */
145 sh = (div (sh, len)).rem;
149 src = &sptr[sh * soffset];
152 for (n = 0; n < len; n++)
154 memcpy (dest, src, size);
156 if (n == len - sh - 1)
162 /* Advance to the next section. */
168 while (count[n] == extent[n])
170 /* When we get to the end of a dimension, reset it and increment
171 the next dimension. */
173 /* We could precalculate these products, but this is a less
174 frequently used path so proabably not worth it. */
175 rptr -= rstride[n] * extent[n];
176 sptr -= sstride[n] * extent[n];
177 hptr -= hstride[n] * extent[n];
181 /* Break out of the loop. */
196 void cshift1_`'atype_kind (gfc_array_char *, const gfc_array_char *,
197 const atype *, const atype_name *);
198 export_proto(cshift1_`'atype_kind);
201 cshift1_`'atype_kind (gfc_array_char * ret,
202 const gfc_array_char * array,
203 const atype * h, const atype_name * pwhich)
205 cshift1 (ret, array, h, pwhich, GFC_DESCRIPTOR_SIZE (array));
208 void cshift1_`'atype_kind`'_char (gfc_array_char * ret, GFC_INTEGER_4,
209 const gfc_array_char * array,
210 const atype * h, const atype_name * pwhich,
212 export_proto(cshift1_`'atype_kind`'_char);
215 cshift1_`'atype_kind`'_char (gfc_array_char * ret,
216 GFC_INTEGER_4 ret_length __attribute__((unused)),
217 const gfc_array_char * array,
218 const atype * h, const atype_name * pwhich,
219 GFC_INTEGER_4 array_length)
221 cshift1 (ret, array, h, pwhich, array_length);