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8e1d7686 | 1 | /* Helper function for repacking arrays. |
85ec4feb | 2 | Copyright (C) 2003-2018 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_INTEGER_2) | |
30 | ||
31 | /* Allocates a block of memory with internal_malloc if the array needs | |
32 | repacking. */ | |
33 | ||
34 | GFC_INTEGER_2 * | |
35 | internal_pack_2 (gfc_array_i2 * 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_INTEGER_2 *src; | |
5863aacf | 44 | GFC_INTEGER_2 * restrict dest; |
8e1d7686 TK |
45 | GFC_INTEGER_2 *destptr; |
46 | int n; | |
47 | int packed; | |
48 | ||
49 | /* TODO: Investigate how we can figure out if this is a temporary | |
50 | since the stride=0 thing has been removed from the frontend. */ | |
51 | ||
52 | dim = GFC_DESCRIPTOR_RANK (source); | |
53 | ssize = 1; | |
54 | packed = 1; | |
55 | for (n = 0; n < dim; n++) | |
56 | { | |
57 | count[n] = 0; | |
dfb55fdc TK |
58 | stride[n] = GFC_DESCRIPTOR_STRIDE(source,n); |
59 | extent[n] = GFC_DESCRIPTOR_EXTENT(source,n); | |
8e1d7686 TK |
60 | if (extent[n] <= 0) |
61 | { | |
62 | /* Do nothing. */ | |
63 | packed = 1; | |
64 | break; | |
65 | } | |
66 | ||
67 | if (ssize != stride[n]) | |
68 | packed = 0; | |
69 | ||
70 | ssize *= extent[n]; | |
71 | } | |
72 | ||
73 | if (packed) | |
21d1335b | 74 | return source->base_addr; |
8e1d7686 TK |
75 | |
76 | /* Allocate storage for the destination. */ | |
92e6f3a4 | 77 | destptr = xmallocarray (ssize, sizeof (GFC_INTEGER_2)); |
8e1d7686 | 78 | dest = destptr; |
21d1335b | 79 | src = source->base_addr; |
8e1d7686 TK |
80 | stride0 = stride[0]; |
81 | ||
82 | ||
83 | while (src) | |
84 | { | |
85 | /* Copy the data. */ | |
86 | *(dest++) = *src; | |
87 | /* Advance to the next element. */ | |
88 | src += stride0; | |
89 | count[0]++; | |
90 | /* Advance to the next source element. */ | |
91 | n = 0; | |
92 | while (count[n] == extent[n]) | |
93 | { | |
94 | /* When we get to the end of a dimension, reset it and increment | |
95 | the next dimension. */ | |
96 | count[n] = 0; | |
97 | /* We could precalculate these products, but this is a less | |
98 | frequently used path so probably not worth it. */ | |
99 | src -= stride[n] * extent[n]; | |
100 | n++; | |
101 | if (n == dim) | |
102 | { | |
103 | src = NULL; | |
104 | break; | |
105 | } | |
106 | else | |
107 | { | |
108 | count[n]++; | |
109 | src += stride[n]; | |
110 | } | |
111 | } | |
112 | } | |
113 | return destptr; | |
114 | } | |
115 | ||
116 | #endif | |
117 |