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8e1d7686 | 1 | /* Helper function for repacking arrays. |
a5544970 | 2 | Copyright (C) 2003-2019 Free Software Foundation, Inc. |
8e1d7686 TK |
3 | Contributed by Paul Brook <paul@nowt.org> |
4 | ||
21d1335b | 5 | This file is part of the GNU Fortran runtime library (libgfortran). |
8e1d7686 TK |
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 | |
748086b7 | 10 | version 3 of the License, or (at your option) any later version. |
8e1d7686 TK |
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 | ||
748086b7 JJ |
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/>. */ | |
8e1d7686 TK |
25 | |
26 | #include "libgfortran.h" | |
8e1d7686 TK |
27 | |
28 | ||
29 | #if defined (HAVE_GFC_REAL_4) | |
30 | ||
31 | /* Allocates a block of memory with internal_malloc if the array needs | |
32 | repacking. */ | |
33 | ||
34 | GFC_REAL_4 * | |
35 | internal_pack_r4 (gfc_array_r4 * source) | |
36 | { | |
37 | index_type count[GFC_MAX_DIMENSIONS]; | |
38 | index_type extent[GFC_MAX_DIMENSIONS]; | |
39 | index_type stride[GFC_MAX_DIMENSIONS]; | |
40 | index_type stride0; | |
41 | index_type dim; | |
42 | index_type ssize; | |
43 | const GFC_REAL_4 *src; | |
5863aacf | 44 | GFC_REAL_4 * restrict dest; |
8e1d7686 | 45 | GFC_REAL_4 *destptr; |
8e1d7686 TK |
46 | int packed; |
47 | ||
48 | /* TODO: Investigate how we can figure out if this is a temporary | |
49 | since the stride=0 thing has been removed from the frontend. */ | |
50 | ||
51 | dim = GFC_DESCRIPTOR_RANK (source); | |
52 | ssize = 1; | |
53 | packed = 1; | |
7a157266 | 54 | for (index_type n = 0; n < dim; n++) |
8e1d7686 TK |
55 | { |
56 | count[n] = 0; | |
dfb55fdc TK |
57 | stride[n] = GFC_DESCRIPTOR_STRIDE(source,n); |
58 | extent[n] = GFC_DESCRIPTOR_EXTENT(source,n); | |
8e1d7686 TK |
59 | if (extent[n] <= 0) |
60 | { | |
61 | /* Do nothing. */ | |
62 | packed = 1; | |
63 | break; | |
64 | } | |
65 | ||
66 | if (ssize != stride[n]) | |
67 | packed = 0; | |
68 | ||
69 | ssize *= extent[n]; | |
70 | } | |
71 | ||
72 | if (packed) | |
21d1335b | 73 | return source->base_addr; |
8e1d7686 TK |
74 | |
75 | /* Allocate storage for the destination. */ | |
92e6f3a4 | 76 | destptr = xmallocarray (ssize, sizeof (GFC_REAL_4)); |
8e1d7686 | 77 | dest = destptr; |
21d1335b | 78 | src = source->base_addr; |
8e1d7686 TK |
79 | stride0 = stride[0]; |
80 | ||
81 | ||
82 | while (src) | |
83 | { | |
84 | /* Copy the data. */ | |
85 | *(dest++) = *src; | |
86 | /* Advance to the next element. */ | |
87 | src += stride0; | |
88 | count[0]++; | |
89 | /* Advance to the next source element. */ | |
7a157266 | 90 | index_type n = 0; |
8e1d7686 TK |
91 | while (count[n] == extent[n]) |
92 | { | |
93 | /* When we get to the end of a dimension, reset it and increment | |
94 | the next dimension. */ | |
95 | count[n] = 0; | |
96 | /* We could precalculate these products, but this is a less | |
97 | frequently used path so probably not worth it. */ | |
98 | src -= stride[n] * extent[n]; | |
99 | n++; | |
100 | if (n == dim) | |
101 | { | |
102 | src = NULL; | |
103 | break; | |
104 | } | |
105 | else | |
106 | { | |
107 | count[n]++; | |
108 | src += stride[n]; | |
109 | } | |
110 | } | |
111 | } | |
112 | return destptr; | |
113 | } | |
114 | ||
115 | #endif | |
116 |