1 /* Implementation of the CSHIFT intrinsic
2 Copyright (C) 2003-2016 Free Software Foundation, Inc.
3 Contributed by Feng Wang <wf_cs@yahoo.com>
4
5 This file is part of the GNU Fortran runtime library (libgfortran).
6
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 3 of the License, or (at your option) any later version.
11
12 Ligbfortran is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
20
21 You should have received a copy of the GNU General Public License and
22 a copy of the GCC Runtime Library Exception along with this program;
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 <http://www.gnu.org/licenses/>. */
25
26 #include "libgfortran.h"
27 #include <stdlib.h>
28 #include <assert.h>
29 #include <string.h>
30
31
32 #if defined (HAVE_GFC_INTEGER_4)
33
34 static void
cshift1(gfc_array_char * const restrict ret,const gfc_array_char * const restrict array,const gfc_array_i4 * const restrict h,const GFC_INTEGER_4 * const restrict pwhich)35 cshift1 (gfc_array_char * const restrict ret,
36 const gfc_array_char * const restrict array,
37 const gfc_array_i4 * const restrict h,
38 const GFC_INTEGER_4 * const restrict pwhich)
39 {
40 /* r.* indicates the return array. */
41 index_type rstride[GFC_MAX_DIMENSIONS];
42 index_type rstride0;
43 index_type roffset;
44 char *rptr;
45 char *dest;
46 /* s.* indicates the source array. */
47 index_type sstride[GFC_MAX_DIMENSIONS];
48 index_type sstride0;
49 index_type soffset;
50 const char *sptr;
51 const char *src;
52 /* h.* indicates the shift array. */
53 index_type hstride[GFC_MAX_DIMENSIONS];
54 index_type hstride0;
55 const GFC_INTEGER_4 *hptr;
56
57 index_type count[GFC_MAX_DIMENSIONS];
58 index_type extent[GFC_MAX_DIMENSIONS];
59 index_type dim;
60 index_type len;
61 index_type n;
62 int which;
63 GFC_INTEGER_4 sh;
64 index_type arraysize;
65 index_type size;
66
67 if (pwhich)
68 which = *pwhich - 1;
69 else
70 which = 0;
71
72 if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
73 runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
74
75 size = GFC_DESCRIPTOR_SIZE(array);
76
77 arraysize = size0 ((array_t *)array);
78
79 if (ret->base_addr == NULL)
80 {
81 int i;
82
83 ret->base_addr = xmallocarray (arraysize, size);
84 ret->offset = 0;
85 ret->dtype = array->dtype;
86 for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
87 {
88 index_type ub, str;
89
90 ub = GFC_DESCRIPTOR_EXTENT(array,i) - 1;
91
92 if (i == 0)
93 str = 1;
94 else
95 str = GFC_DESCRIPTOR_EXTENT(ret,i-1) *
96 GFC_DESCRIPTOR_STRIDE(ret,i-1);
97
98 GFC_DIMENSION_SET(ret->dim[i], 0, ub, str);
99 }
100 }
101 else if (unlikely (compile_options.bounds_check))
102 {
103 bounds_equal_extents ((array_t *) ret, (array_t *) array,
104 "return value", "CSHIFT");
105 }
106
107 if (unlikely (compile_options.bounds_check))
108 {
109 bounds_reduced_extents ((array_t *) h, (array_t *) array, which,
110 "SHIFT argument", "CSHIFT");
111 }
112
113 if (arraysize == 0)
114 return;
115
116 extent[0] = 1;
117 count[0] = 0;
118 n = 0;
119
120 /* Initialized for avoiding compiler warnings. */
121 roffset = size;
122 soffset = size;
123 len = 0;
124
125 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
126 {
127 if (dim == which)
128 {
129 roffset = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
130 if (roffset == 0)
131 roffset = size;
132 soffset = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
133 if (soffset == 0)
134 soffset = size;
135 len = GFC_DESCRIPTOR_EXTENT(array,dim);
136 }
137 else
138 {
139 count[n] = 0;
140 extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim);
141 rstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(ret,dim);
142 sstride[n] = GFC_DESCRIPTOR_STRIDE_BYTES(array,dim);
143
144 hstride[n] = GFC_DESCRIPTOR_STRIDE(h,n);
145 n++;
146 }
147 }
148 if (sstride[0] == 0)
149 sstride[0] = size;
150 if (rstride[0] == 0)
151 rstride[0] = size;
152 if (hstride[0] == 0)
153 hstride[0] = 1;
154
155 dim = GFC_DESCRIPTOR_RANK (array);
156 rstride0 = rstride[0];
157 sstride0 = sstride[0];
158 hstride0 = hstride[0];
159 rptr = ret->base_addr;
160 sptr = array->base_addr;
161 hptr = h->base_addr;
162
163 while (rptr)
164 {
165 /* Do the shift for this dimension. */
166 sh = *hptr;
167 sh = (div (sh, len)).rem;
168 if (sh < 0)
169 sh += len;
170
171 src = &sptr[sh * soffset];
172 dest = rptr;
173
174 for (n = 0; n < len; n++)
175 {
176 memcpy (dest, src, size);
177 dest += roffset;
178 if (n == len - sh - 1)
179 src = sptr;
180 else
181 src += soffset;
182 }
183
184 /* Advance to the next section. */
185 rptr += rstride0;
186 sptr += sstride0;
187 hptr += hstride0;
188 count[0]++;
189 n = 0;
190 while (count[n] == extent[n])
191 {
192 /* When we get to the end of a dimension, reset it and increment
193 the next dimension. */
194 count[n] = 0;
195 /* We could precalculate these products, but this is a less
196 frequently used path so probably not worth it. */
197 rptr -= rstride[n] * extent[n];
198 sptr -= sstride[n] * extent[n];
199 hptr -= hstride[n] * extent[n];
200 n++;
201 if (n >= dim - 1)
202 {
203 /* Break out of the loop. */
204 rptr = NULL;
205 break;
206 }
207 else
208 {
209 count[n]++;
210 rptr += rstride[n];
211 sptr += sstride[n];
212 hptr += hstride[n];
213 }
214 }
215 }
216 }
217
218 void cshift1_4 (gfc_array_char * const restrict,
219 const gfc_array_char * const restrict,
220 const gfc_array_i4 * const restrict,
221 const GFC_INTEGER_4 * const restrict);
222 export_proto(cshift1_4);
223
224 void
cshift1_4(gfc_array_char * const restrict ret,const gfc_array_char * const restrict array,const gfc_array_i4 * const restrict h,const GFC_INTEGER_4 * const restrict pwhich)225 cshift1_4 (gfc_array_char * const restrict ret,
226 const gfc_array_char * const restrict array,
227 const gfc_array_i4 * const restrict h,
228 const GFC_INTEGER_4 * const restrict pwhich)
229 {
230 cshift1 (ret, array, h, pwhich);
231 }
232
233
234 void cshift1_4_char (gfc_array_char * const restrict ret,
235 GFC_INTEGER_4,
236 const gfc_array_char * const restrict array,
237 const gfc_array_i4 * const restrict h,
238 const GFC_INTEGER_4 * const restrict pwhich,
239 GFC_INTEGER_4);
240 export_proto(cshift1_4_char);
241
242 void
cshift1_4_char(gfc_array_char * const restrict ret,GFC_INTEGER_4 ret_length,const gfc_array_char * const restrict array,const gfc_array_i4 * const restrict h,const GFC_INTEGER_4 * const restrict pwhich,GFC_INTEGER_4 array_length)243 cshift1_4_char (gfc_array_char * const restrict ret,
244 GFC_INTEGER_4 ret_length __attribute__((unused)),
245 const gfc_array_char * const restrict array,
246 const gfc_array_i4 * const restrict h,
247 const GFC_INTEGER_4 * const restrict pwhich,
248 GFC_INTEGER_4 array_length __attribute__((unused)))
249 {
250 cshift1 (ret, array, h, pwhich);
251 }
252
253
254 void cshift1_4_char4 (gfc_array_char * const restrict ret,
255 GFC_INTEGER_4,
256 const gfc_array_char * const restrict array,
257 const gfc_array_i4 * const restrict h,
258 const GFC_INTEGER_4 * const restrict pwhich,
259 GFC_INTEGER_4);
260 export_proto(cshift1_4_char4);
261
262 void
cshift1_4_char4(gfc_array_char * const restrict ret,GFC_INTEGER_4 ret_length,const gfc_array_char * const restrict array,const gfc_array_i4 * const restrict h,const GFC_INTEGER_4 * const restrict pwhich,GFC_INTEGER_4 array_length)263 cshift1_4_char4 (gfc_array_char * const restrict ret,
264 GFC_INTEGER_4 ret_length __attribute__((unused)),
265 const gfc_array_char * const restrict array,
266 const gfc_array_i4 * const restrict h,
267 const GFC_INTEGER_4 * const restrict pwhich,
268 GFC_INTEGER_4 array_length __attribute__((unused)))
269 {
270 cshift1 (ret, array, h, pwhich);
271 }
272
273 #endif
274