1 /* Generic implementation of the SPREAD intrinsic
2 Copyright 2002, 2005, 2006, 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"
37 spread_internal (gfc_array_char *ret, const gfc_array_char *source,
38 const index_type *along, const index_type *pncopies,
41 /* r.* indicates the return array. */
42 index_type rstride[GFC_MAX_DIMENSIONS];
44 index_type rdelta = 0;
49 /* s.* indicates the source array. */
50 index_type sstride[GFC_MAX_DIMENSIONS];
55 index_type count[GFC_MAX_DIMENSIONS];
56 index_type extent[GFC_MAX_DIMENSIONS];
61 srank = GFC_DESCRIPTOR_RANK(source);
64 if (rrank > GFC_MAX_DIMENSIONS)
65 runtime_error ("return rank too large in spread()");
68 runtime_error ("dim outside of rank in spread()");
72 if (ret->data == NULL)
74 /* The front end has signalled that we need to populate the
75 return array descriptor. */
76 ret->dtype = (source->dtype & ~GFC_DTYPE_RANK_MASK) | rrank;
79 for (n = 0; n < rrank; n++)
81 ret->dim[n].stride = rs;
82 ret->dim[n].lbound = 0;
85 ret->dim[n].ubound = ncopies - 1;
92 extent[dim] = source->dim[dim].ubound + 1
93 - source->dim[dim].lbound;
94 sstride[dim] = source->dim[dim].stride * size;
95 rstride[dim] = rs * size;
97 ret->dim[n].ubound = extent[dim]-1;
104 ret->data = internal_malloc_size (rs * size);
107 ret->data = internal_malloc_size (1);
118 if (GFC_DESCRIPTOR_RANK(ret) != rrank)
119 runtime_error ("rank mismatch in spread()");
121 if (compile_options.bounds_check)
123 for (n = 0; n < rrank; n++)
125 index_type ret_extent;
127 ret_extent = ret->dim[n].ubound + 1 - ret->dim[n].lbound;
130 rdelta = ret->dim[n].stride * size;
132 if (ret_extent != ncopies)
133 runtime_error("Incorrect extent in return value of SPREAD"
134 " intrinsic in dimension %ld: is %ld,"
135 " should be %ld", (long int) n+1,
136 (long int) ret_extent, (long int) ncopies);
141 extent[dim] = source->dim[dim].ubound + 1
142 - source->dim[dim].lbound;
143 if (ret_extent != extent[dim])
144 runtime_error("Incorrect extent in return value of SPREAD"
145 " intrinsic in dimension %ld: is %ld,"
146 " should be %ld", (long int) n+1,
147 (long int) ret_extent,
148 (long int) extent[dim]);
150 if (extent[dim] <= 0)
152 sstride[dim] = source->dim[dim].stride * size;
153 rstride[dim] = ret->dim[n].stride * size;
160 for (n = 0; n < rrank; n++)
164 rdelta = ret->dim[n].stride * size;
169 extent[dim] = source->dim[dim].ubound + 1
170 - source->dim[dim].lbound;
171 if (extent[dim] <= 0)
173 sstride[dim] = source->dim[dim].stride * size;
174 rstride[dim] = ret->dim[n].stride * size;
186 sstride0 = sstride[0];
187 rstride0 = rstride[0];
193 /* Spread this element. */
195 for (n = 0; n < ncopies; n++)
197 memcpy (dest, sptr, size);
200 /* Advance to the next element. */
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 sptr -= sstride[n] * extent[n];
213 rptr -= rstride[n] * extent[n];
217 /* Break out of the loop. */
231 /* This version of spread_internal treats the special case of a scalar
232 source. This is much simpler than the more general case above. */
235 spread_internal_scalar (gfc_array_char *ret, const char *source,
236 const index_type *along, const index_type *pncopies,
240 int ncopies = *pncopies;
243 if (GFC_DESCRIPTOR_RANK (ret) != 1)
244 runtime_error ("incorrect destination rank in spread()");
247 runtime_error ("dim outside of rank in spread()");
249 if (ret->data == NULL)
251 ret->data = internal_malloc_size (ncopies * size);
253 ret->dim[0].stride = 1;
254 ret->dim[0].lbound = 0;
255 ret->dim[0].ubound = ncopies - 1;
259 if (ncopies - 1 > (ret->dim[0].ubound - ret->dim[0].lbound)
260 / ret->dim[0].stride)
261 runtime_error ("dim too large in spread()");
264 for (n = 0; n < ncopies; n++)
266 dest = (char*)(ret->data + n*size*ret->dim[0].stride);
267 memcpy (dest , source, size);
271 extern void spread (gfc_array_char *, const gfc_array_char *,
272 const index_type *, const index_type *);
273 export_proto(spread);
276 spread (gfc_array_char *ret, const gfc_array_char *source,
277 const index_type *along, const index_type *pncopies)
279 spread_internal (ret, source, along, pncopies, GFC_DESCRIPTOR_SIZE (source));
282 extern void spread_char (gfc_array_char *, GFC_INTEGER_4,
283 const gfc_array_char *, const index_type *,
284 const index_type *, GFC_INTEGER_4);
285 export_proto(spread_char);
288 spread_char (gfc_array_char *ret,
289 GFC_INTEGER_4 ret_length __attribute__((unused)),
290 const gfc_array_char *source, const index_type *along,
291 const index_type *pncopies, GFC_INTEGER_4 source_length)
293 spread_internal (ret, source, along, pncopies, source_length);
296 /* The following are the prototypes for the versions of spread with a
299 extern void spread_scalar (gfc_array_char *, const char *,
300 const index_type *, const index_type *);
301 export_proto(spread_scalar);
304 spread_scalar (gfc_array_char *ret, const char *source,
305 const index_type *along, const index_type *pncopies)
308 runtime_error ("return array missing descriptor in spread()");
309 spread_internal_scalar (ret, source, along, pncopies, GFC_DESCRIPTOR_SIZE (ret));
313 extern void spread_char_scalar (gfc_array_char *, GFC_INTEGER_4,
314 const char *, const index_type *,
315 const index_type *, GFC_INTEGER_4);
316 export_proto(spread_char_scalar);
319 spread_char_scalar (gfc_array_char *ret,
320 GFC_INTEGER_4 ret_length __attribute__((unused)),
321 const char *source, const index_type *along,
322 const index_type *pncopies, GFC_INTEGER_4 source_length)
325 runtime_error ("return array missing descriptor in spread()");
326 spread_internal_scalar (ret, source, along, pncopies, source_length);