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"
38 cshift1 (gfc_array_char * ret, const gfc_array_char * array,
39 const gfc_array_i8 * h, const GFC_INTEGER_8 * pwhich, index_type size)
41 /* r.* indicates the return array. */
42 index_type rstride[GFC_MAX_DIMENSIONS];
47 /* s.* indicates the source array. */
48 index_type sstride[GFC_MAX_DIMENSIONS];
53 /* h.* indicates the array. */
54 index_type hstride[GFC_MAX_DIMENSIONS];
56 const GFC_INTEGER_8 *hptr;
58 index_type count[GFC_MAX_DIMENSIONS];
59 index_type extent[GFC_MAX_DIMENSIONS];
71 if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
72 runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
74 if (ret->data == NULL)
78 ret->data = internal_malloc_size (size * size0 ((array_t *)array));
80 ret->dtype = array->dtype;
81 for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
83 ret->dim[i].lbound = 0;
84 ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
87 ret->dim[i].stride = 1;
89 ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
97 /* Initialized for avoiding compiler warnings. */
102 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
106 roffset = ret->dim[dim].stride * size;
109 soffset = array->dim[dim].stride * size;
112 len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
117 extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
118 rstride[n] = ret->dim[dim].stride * size;
119 sstride[n] = array->dim[dim].stride * size;
121 hstride[n] = h->dim[n].stride;
132 dim = GFC_DESCRIPTOR_RANK (array);
133 rstride0 = rstride[0];
134 sstride0 = sstride[0];
135 hstride0 = hstride[0];
142 /* Do the for this dimension. */
144 sh = (div (sh, len)).rem;
148 src = &sptr[sh * soffset];
151 for (n = 0; n < len; n++)
153 memcpy (dest, src, size);
155 if (n == len - sh - 1)
161 /* Advance to the next section. */
167 while (count[n] == extent[n])
169 /* When we get to the end of a dimension, reset it and increment
170 the next dimension. */
172 /* We could precalculate these products, but this is a less
173 frequently used path so proabably not worth it. */
174 rptr -= rstride[n] * extent[n];
175 sptr -= sstride[n] * extent[n];
176 hptr -= hstride[n] * extent[n];
180 /* Break out of the loop. */
195 void cshift1_8 (gfc_array_char *, const gfc_array_char *,
196 const gfc_array_i8 *, const GFC_INTEGER_8 *);
197 export_proto(cshift1_8);
200 cshift1_8 (gfc_array_char * ret,
201 const gfc_array_char * array,
202 const gfc_array_i8 * h, const GFC_INTEGER_8 * pwhich)
204 cshift1 (ret, array, h, pwhich, GFC_DESCRIPTOR_SIZE (array));
207 void cshift1_8_char (gfc_array_char * ret, GFC_INTEGER_4,
208 const gfc_array_char * array,
209 const gfc_array_i8 * h, const GFC_INTEGER_8 * pwhich,
211 export_proto(cshift1_8_char);
214 cshift1_8_char (gfc_array_char * ret,
215 GFC_INTEGER_4 ret_length __attribute__((unused)),
216 const gfc_array_char * array,
217 const gfc_array_i8 * h, const GFC_INTEGER_8 * pwhich,
218 GFC_INTEGER_4 array_length)
220 cshift1 (ret, array, h, pwhich, array_length);