1 /* Generic implementation of the EOSHIFT intrinsic
2 Copyright 2002, 2005, 2007 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 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. */
31 #include "libgfortran.h"
36 /* TODO: make this work for large shifts when
37 sizeof(int) < sizeof (index_type). */
40 eoshift2 (gfc_array_char *ret, const gfc_array_char *array,
41 int shift, const gfc_array_char *bound, int which,
42 index_type size, char filler)
44 /* r.* indicates the return array. */
45 index_type rstride[GFC_MAX_DIMENSIONS];
50 /* s.* indicates the source array. */
51 index_type sstride[GFC_MAX_DIMENSIONS];
56 /* b.* indicates the bound array. */
57 index_type bstride[GFC_MAX_DIMENSIONS];
61 index_type count[GFC_MAX_DIMENSIONS];
62 index_type extent[GFC_MAX_DIMENSIONS];
67 /* The compiler cannot figure out that these are set, initialize
68 them to avoid warnings. */
73 if (ret->data == NULL)
77 ret->data = internal_malloc_size (size * size0 ((array_t *)array));
79 ret->dtype = array->dtype;
80 for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
82 ret->dim[i].lbound = 0;
83 ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
86 ret->dim[i].stride = 1;
88 ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
100 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
104 roffset = ret->dim[dim].stride * size;
107 soffset = array->dim[dim].stride * size;
110 len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
115 extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
116 rstride[n] = ret->dim[dim].stride * size;
117 sstride[n] = array->dim[dim].stride * size;
119 bstride[n] = bound->dim[n].stride * size;
129 if (bound && bstride[0] == 0)
132 dim = GFC_DESCRIPTOR_RANK (array);
133 rstride0 = rstride[0];
134 sstride0 = sstride[0];
135 bstride0 = bstride[0];
139 if ((shift >= 0 ? shift : -shift ) > len)
159 /* Do the shift for this dimension. */
162 src = &sptr[shift * soffset];
168 dest = &rptr[-shift * roffset];
170 for (n = 0; n < len; n++)
172 memcpy (dest, src, size);
189 memcpy (dest, bptr, size);
195 memset (dest, filler, size);
199 /* Advance to the next section. */
205 while (count[n] == extent[n])
207 /* When we get to the end of a dimension, reset it and increment
208 the next dimension. */
210 /* We could precalculate these products, but this is a less
211 frequently used path so probably not worth it. */
212 rptr -= rstride[n] * extent[n];
213 sptr -= sstride[n] * extent[n];
214 bptr -= bstride[n] * extent[n];
218 /* Break out of the loop. */
234 #define DEFINE_EOSHIFT(N) \
235 extern void eoshift2_##N (gfc_array_char *, const gfc_array_char *, \
236 const GFC_INTEGER_##N *, const gfc_array_char *, \
237 const GFC_INTEGER_##N *); \
238 export_proto(eoshift2_##N); \
241 eoshift2_##N (gfc_array_char *ret, const gfc_array_char *array, \
242 const GFC_INTEGER_##N *pshift, const gfc_array_char *pbound, \
243 const GFC_INTEGER_##N *pdim) \
245 eoshift2 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \
246 GFC_DESCRIPTOR_SIZE (array), 0); \
249 extern void eoshift2_##N##_char (gfc_array_char *, GFC_INTEGER_4, \
250 const gfc_array_char *, \
251 const GFC_INTEGER_##N *, \
252 const gfc_array_char *, \
253 const GFC_INTEGER_##N *, \
254 GFC_INTEGER_4, GFC_INTEGER_4); \
255 export_proto(eoshift2_##N##_char); \
258 eoshift2_##N##_char (gfc_array_char *ret, \
259 GFC_INTEGER_4 ret_length __attribute__((unused)), \
260 const gfc_array_char *array, \
261 const GFC_INTEGER_##N *pshift, \
262 const gfc_array_char *pbound, \
263 const GFC_INTEGER_##N *pdim, \
264 GFC_INTEGER_4 array_length, \
265 GFC_INTEGER_4 bound_length __attribute__((unused))) \
267 eoshift2 (ret, array, *pshift, pbound, pdim ? *pdim : 1, \
268 array_length, ' '); \