1 /* Generic 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 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., 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 /* TODO: make this work for large shifts when
41 sizeof(int) < sizeof (index_type). */
44 eoshift2 (gfc_array_char *ret, const gfc_array_char *array,
45 int shift, const gfc_array_char *bound, int which)
47 /* r.* indicates the return array. */
48 index_type rstride[GFC_MAX_DIMENSIONS];
53 /* s.* indicates the source array. */
54 index_type sstride[GFC_MAX_DIMENSIONS];
59 /* b.* indicates the bound array. */
60 index_type bstride[GFC_MAX_DIMENSIONS];
64 index_type count[GFC_MAX_DIMENSIONS];
65 index_type extent[GFC_MAX_DIMENSIONS];
71 /* The compiler cannot figure out that these are set, initialize
72 them to avoid warnings. */
77 size = GFC_DESCRIPTOR_SIZE (ret);
79 if (ret->data == NULL)
83 ret->data = internal_malloc_size (size * size0 ((array_t *)array));
85 ret->dtype = array->dtype;
86 for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
88 ret->dim[i].lbound = 0;
89 ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
92 ret->dim[i].stride = 1;
94 ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
102 size = GFC_DESCRIPTOR_SIZE (array);
104 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
108 roffset = ret->dim[dim].stride * size;
111 soffset = array->dim[dim].stride * size;
114 len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
119 extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
120 rstride[n] = ret->dim[dim].stride * size;
121 sstride[n] = array->dim[dim].stride * size;
123 bstride[n] = bound->dim[n].stride * size;
133 if (bound && bstride[0] == 0)
136 dim = GFC_DESCRIPTOR_RANK (array);
137 rstride0 = rstride[0];
138 sstride0 = sstride[0];
139 bstride0 = bstride[0];
143 if ((shift >= 0 ? shift : -shift ) > len)
163 /* Do the shift for this dimension. */
166 src = &sptr[shift * soffset];
172 dest = &rptr[-shift * roffset];
174 for (n = 0; n < len; n++)
176 memcpy (dest, src, size);
192 memcpy (dest, bptr, 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 bptr -= bstride[n] * extent[n];
215 /* Break out of the loop. */
231 extern void eoshift2_1 (gfc_array_char *, const gfc_array_char *,
232 const GFC_INTEGER_1 *, const gfc_array_char *,
233 const GFC_INTEGER_1 *);
234 export_proto(eoshift2_1);
237 eoshift2_1 (gfc_array_char *ret, const gfc_array_char *array,
238 const GFC_INTEGER_1 *pshift, const gfc_array_char *bound,
239 const GFC_INTEGER_1 *pdim)
241 eoshift2 (ret, array, *pshift, bound, pdim ? *pdim : 1);
245 extern void eoshift2_2 (gfc_array_char *, const gfc_array_char *,
246 const GFC_INTEGER_2 *, const gfc_array_char *,
247 const GFC_INTEGER_2 *);
248 export_proto(eoshift2_2);
251 eoshift2_2 (gfc_array_char *ret, const gfc_array_char *array,
252 const GFC_INTEGER_2 *pshift, const gfc_array_char *bound,
253 const GFC_INTEGER_2 *pdim)
255 eoshift2 (ret, array, *pshift, bound, pdim ? *pdim : 1);
259 extern void eoshift2_4 (gfc_array_char *, const gfc_array_char *,
260 const GFC_INTEGER_4 *, const gfc_array_char *,
261 const GFC_INTEGER_4 *);
262 export_proto(eoshift2_4);
265 eoshift2_4 (gfc_array_char *ret, const gfc_array_char *array,
266 const GFC_INTEGER_4 *pshift, const gfc_array_char *bound,
267 const GFC_INTEGER_4 *pdim)
269 eoshift2 (ret, array, *pshift, bound, pdim ? *pdim : 1);
273 extern void eoshift2_8 (gfc_array_char *, const gfc_array_char *,
274 const GFC_INTEGER_8 *, const gfc_array_char *,
275 const GFC_INTEGER_8 *);
276 export_proto(eoshift2_8);
279 eoshift2_8 (gfc_array_char *ret, const gfc_array_char *array,
280 const GFC_INTEGER_8 *pshift, const gfc_array_char *bound,
281 const GFC_INTEGER_8 *pdim)
283 eoshift2 (ret, array, *pshift, bound, pdim ? *pdim : 1);