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95f15c5b | 1 | /* Helper function for cshift functions. |
f1717362 | 2 | Copyright (C) 2008-2016 Free Software Foundation, Inc. |
95f15c5b | 3 | Contributed by Thomas Koenig <tkoenig@gcc.gnu.org> |
4 | ||
553877d9 | 5 | This file is part of the GNU Fortran runtime library (libgfortran). |
95f15c5b | 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 | |
6bc9506f | 10 | version 3 of the License, or (at your option) any later version. |
95f15c5b | 11 | |
12 | Libgfortran 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 | ||
6bc9506f | 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/>. */ | |
95f15c5b | 25 | |
26 | #include "libgfortran.h" | |
27 | #include <stdlib.h> | |
28 | #include <assert.h> | |
29 | #include <string.h> | |
30 | ||
31 | ||
32 | #if defined (HAVE_GFC_REAL_10) | |
33 | ||
34 | void | |
c75dca49 | 35 | cshift0_r10 (gfc_array_r10 *ret, const gfc_array_r10 *array, ptrdiff_t shift, |
95f15c5b | 36 | int which) |
37 | { | |
38 | /* r.* indicates the return array. */ | |
39 | index_type rstride[GFC_MAX_DIMENSIONS]; | |
40 | index_type rstride0; | |
41 | index_type roffset; | |
42 | GFC_REAL_10 *rptr; | |
43 | ||
44 | /* s.* indicates the source array. */ | |
45 | index_type sstride[GFC_MAX_DIMENSIONS]; | |
46 | index_type sstride0; | |
47 | index_type soffset; | |
48 | const GFC_REAL_10 *sptr; | |
49 | ||
50 | index_type count[GFC_MAX_DIMENSIONS]; | |
51 | index_type extent[GFC_MAX_DIMENSIONS]; | |
52 | index_type dim; | |
53 | index_type len; | |
54 | index_type n; | |
55 | ||
56 | which = which - 1; | |
57 | sstride[0] = 0; | |
58 | rstride[0] = 0; | |
59 | ||
60 | extent[0] = 1; | |
61 | count[0] = 0; | |
62 | n = 0; | |
63 | /* Initialized for avoiding compiler warnings. */ | |
64 | roffset = 1; | |
65 | soffset = 1; | |
66 | len = 0; | |
67 | ||
68 | for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++) | |
69 | { | |
70 | if (dim == which) | |
71 | { | |
827aef63 | 72 | roffset = GFC_DESCRIPTOR_STRIDE(ret,dim); |
95f15c5b | 73 | if (roffset == 0) |
74 | roffset = 1; | |
827aef63 | 75 | soffset = GFC_DESCRIPTOR_STRIDE(array,dim); |
95f15c5b | 76 | if (soffset == 0) |
77 | soffset = 1; | |
827aef63 | 78 | len = GFC_DESCRIPTOR_EXTENT(array,dim); |
95f15c5b | 79 | } |
80 | else | |
81 | { | |
82 | count[n] = 0; | |
827aef63 | 83 | extent[n] = GFC_DESCRIPTOR_EXTENT(array,dim); |
84 | rstride[n] = GFC_DESCRIPTOR_STRIDE(ret,dim); | |
85 | sstride[n] = GFC_DESCRIPTOR_STRIDE(array,dim); | |
95f15c5b | 86 | n++; |
87 | } | |
88 | } | |
89 | if (sstride[0] == 0) | |
90 | sstride[0] = 1; | |
91 | if (rstride[0] == 0) | |
92 | rstride[0] = 1; | |
93 | ||
94 | dim = GFC_DESCRIPTOR_RANK (array); | |
95 | rstride0 = rstride[0]; | |
96 | sstride0 = sstride[0]; | |
553877d9 | 97 | rptr = ret->base_addr; |
98 | sptr = array->base_addr; | |
95f15c5b | 99 | |
37598f0f | 100 | /* Avoid the costly modulo for trivially in-bound shifts. */ |
101 | if (shift < 0 || shift >= len) | |
102 | { | |
103 | shift = len == 0 ? 0 : shift % (ptrdiff_t)len; | |
104 | if (shift < 0) | |
105 | shift += len; | |
106 | } | |
95f15c5b | 107 | |
108 | while (rptr) | |
109 | { | |
110 | /* Do the shift for this dimension. */ | |
111 | ||
112 | /* If elements are contiguous, perform the operation | |
113 | in two block moves. */ | |
114 | if (soffset == 1 && roffset == 1) | |
115 | { | |
116 | size_t len1 = shift * sizeof (GFC_REAL_10); | |
117 | size_t len2 = (len - shift) * sizeof (GFC_REAL_10); | |
118 | memcpy (rptr, sptr + shift, len2); | |
119 | memcpy (rptr + (len - shift), sptr, len1); | |
120 | } | |
121 | else | |
122 | { | |
123 | /* Otherwise, we will have to perform the copy one element at | |
124 | a time. */ | |
125 | GFC_REAL_10 *dest = rptr; | |
126 | const GFC_REAL_10 *src = &sptr[shift * soffset]; | |
127 | ||
128 | for (n = 0; n < len - shift; n++) | |
129 | { | |
130 | *dest = *src; | |
131 | dest += roffset; | |
132 | src += soffset; | |
133 | } | |
134 | for (src = sptr, n = 0; n < shift; n++) | |
135 | { | |
136 | *dest = *src; | |
137 | dest += roffset; | |
138 | src += soffset; | |
139 | } | |
140 | } | |
141 | ||
142 | /* Advance to the next section. */ | |
143 | rptr += rstride0; | |
144 | sptr += sstride0; | |
145 | count[0]++; | |
146 | n = 0; | |
147 | while (count[n] == extent[n]) | |
148 | { | |
149 | /* When we get to the end of a dimension, reset it and increment | |
150 | the next dimension. */ | |
151 | count[n] = 0; | |
152 | /* We could precalculate these products, but this is a less | |
153 | frequently used path so probably not worth it. */ | |
154 | rptr -= rstride[n] * extent[n]; | |
155 | sptr -= sstride[n] * extent[n]; | |
156 | n++; | |
157 | if (n >= dim - 1) | |
158 | { | |
159 | /* Break out of the loop. */ | |
160 | rptr = NULL; | |
161 | break; | |
162 | } | |
163 | else | |
164 | { | |
165 | count[n]++; | |
166 | rptr += rstride[n]; | |
167 | sptr += sstride[n]; | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
172 | return; | |
173 | } | |
174 | ||
175 | #endif |