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., 59 Temple Place - Suite 330,
29 Boston, MA 02111-1307, USA. */
35 #include "libgfortran.h"
37 static const char zeros[16] =
38 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
40 extern void eoshift3_8 (gfc_array_char *, gfc_array_char *,
41 gfc_array_i8 *, const gfc_array_char *,
43 export_proto(eoshift3_8);
46 eoshift3_8 (gfc_array_char *ret, gfc_array_char *array,
47 gfc_array_i8 *h, const gfc_array_char *bound,
48 GFC_INTEGER_8 *pwhich)
50 /* r.* indicates the return array. */
51 index_type rstride[GFC_MAX_DIMENSIONS];
56 /* s.* indicates the source array. */
57 index_type sstride[GFC_MAX_DIMENSIONS];
62 /* h.* indicates the shift array. */
63 index_type hstride[GFC_MAX_DIMENSIONS];
65 const GFC_INTEGER_8 *hptr;
66 /* b.* indicates the bound array. */
67 index_type bstride[GFC_MAX_DIMENSIONS];
71 index_type count[GFC_MAX_DIMENSIONS];
72 index_type extent[GFC_MAX_DIMENSIONS];
81 /* The compiler cannot figure out that these are set, initialize
82 them to avoid warnings. */
92 size = GFC_DESCRIPTOR_SIZE (ret);
96 size = GFC_DESCRIPTOR_SIZE (array);
98 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
102 roffset = ret->dim[dim].stride * size;
105 soffset = array->dim[dim].stride * size;
108 len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
113 extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
114 rstride[n] = ret->dim[dim].stride * size;
115 sstride[n] = array->dim[dim].stride * size;
117 hstride[n] = h->dim[n].stride;
119 bstride[n] = bound->dim[n].stride;
131 if (bound && bstride[0] == 0)
134 dim = GFC_DESCRIPTOR_RANK (array);
135 rstride0 = rstride[0];
136 sstride0 = sstride[0];
137 hstride0 = hstride[0];
138 bstride0 = bstride[0];
149 /* Do the shift for this dimension. */
151 delta = (sh >= 0) ? sh: -sh;
154 src = &sptr[delta * soffset];
160 dest = &rptr[delta * roffset];
162 for (n = 0; n < len - delta; n++)
164 memcpy (dest, src, size);
174 memcpy (dest, bptr, size);
178 /* Advance to the next section. */
185 while (count[n] == extent[n])
187 /* When we get to the end of a dimension, reset it and increment
188 the next dimension. */
190 /* We could precalculate these products, but this is a less
191 frequently used path so proabably not worth it. */
192 rptr -= rstride[n] * extent[n];
193 sptr -= sstride[n] * extent[n];
194 hptr -= hstride[n] * extent[n];
195 bptr -= bstride[n] * extent[n];
199 /* Break out of the loop. */