1 `/* Implementation of the EOSHIFT intrinsic
2 Copyright 2002, 2005 Free Software Foundation, Inc.
3 Contributed by Paul Brook <paul@nowt.org>
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 Libgfortran 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 static const char zeros[16] =
39 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
41 extern void eoshift1_`'atype_kind (gfc_array_char *,
42 const gfc_array_char *,
43 const atype *, const char *,
45 export_proto(eoshift1_`'atype_kind);
48 eoshift1_`'atype_kind (gfc_array_char *ret,
49 const gfc_array_char *array,
50 const atype *h, const char *pbound,
51 const atype_name *pwhich)
53 /* r.* indicates the return array. */
54 index_type rstride[GFC_MAX_DIMENSIONS];
59 /* s.* indicates the source array. */
60 index_type sstride[GFC_MAX_DIMENSIONS];
65 ` /* h.* indicates the shift array. */'
66 index_type hstride[GFC_MAX_DIMENSIONS];
68 const atype_name *hptr;
70 index_type count[GFC_MAX_DIMENSIONS];
71 index_type extent[GFC_MAX_DIMENSIONS];
80 /* The compiler cannot figure out that these are set, initialize
81 them to avoid warnings. */
94 size = GFC_DESCRIPTOR_SIZE (ret);
98 size = GFC_DESCRIPTOR_SIZE (array);
100 if (ret->data == NULL)
104 ret->data = internal_malloc_size (size * size0 ((array_t *)array));
106 ret->dtype = array->dtype;
107 for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
109 ret->dim[i].lbound = 0;
110 ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
113 ret->dim[i].stride = 1;
115 ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
120 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
124 roffset = ret->dim[dim].stride * size;
127 soffset = array->dim[dim].stride * size;
130 len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
135 extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
136 rstride[n] = ret->dim[dim].stride * size;
137 sstride[n] = array->dim[dim].stride * size;
139 hstride[n] = h->dim[n].stride * size;
150 dim = GFC_DESCRIPTOR_RANK (array);
151 rstride0 = rstride[0];
152 sstride0 = sstride[0];
153 hstride0 = hstride[0];
160 ` /* Do the shift for this dimension. */'
162 if (( sh >= 0 ? sh : -sh ) > len)
168 delta = (sh >= 0) ? sh: -sh;
172 src = &sptr[delta * soffset];
178 dest = &rptr[delta * roffset];
180 for (n = 0; n < len - delta; n++)
182 memcpy (dest, src, size);
192 memcpy (dest, pbound, size);
196 /* Advance to the next section. */
202 while (count[n] == extent[n])
204 /* When we get to the end of a dimension, reset it and increment
205 the next dimension. */
207 /* We could precalculate these products, but this is a less
208 frequently used path so proabably not worth it. */
209 rptr -= rstride[n] * extent[n];
210 sptr -= sstride[n] * extent[n];
211 hptr -= hstride[n] * extent[n];
215 /* Break out of the loop. */