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1 | `/* Helper function for repacking arrays. |
2 | Copyright 2003 Free Software Foundation, Inc. | |
3 | Contributed by Paul Brook <paul@nowt.org> | |
4 | ||
5 | This file is part of the GNU Fortran 95 runtime library (libgfortran). | |
6 | ||
7 | Libgfor is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU Lesser General Public | |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
11 | ||
12 | Ligbfor 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 Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public | |
18 | License along with libgfortran; see the file COPYING.LIB. If not, | |
19 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include <stdlib.h> | |
24 | #include <assert.h> | |
25 | #include "libgfortran.h"' | |
26 | include(types.m4)dnl | |
27 | define(rtype_kind, regexp(file, `_.\([0-9]+\)\.', `\1'))dnl | |
28 | define(rtype_letter, regexp(file, `_\(.\)[0-9]+\.', `\1'))dnl | |
29 | define(rtype_code,rtype_letter`'rtype_name)dnl | |
30 | define(rtype,get_arraytype(rtype_letter,rtype_kind))dnl | |
31 | define(rtype_name, get_typename(rtype_letter, rtype_kind))dnl | |
32 | ||
33 | ||
34 | /* Allocates a block of memory with internal_malloc if the array needs | |
35 | repacking. */ | |
36 | ||
37 | dnl Only the kind (ie size) is used to name the function. | |
38 | rtype_name * | |
39 | `internal_pack_'rtype_kind (rtype * source) | |
40 | { | |
41 | index_type count[GFC_MAX_DIMENSIONS - 1]; | |
42 | index_type extent[GFC_MAX_DIMENSIONS - 1]; | |
43 | index_type stride[GFC_MAX_DIMENSIONS - 1]; | |
44 | index_type stride0; | |
45 | index_type dim; | |
46 | index_type ssize; | |
47 | const rtype_name *src; | |
48 | rtype_name *dest; | |
49 | rtype_name *destptr; | |
50 | int n; | |
51 | int packed; | |
52 | ||
53 | if (source->dim[0].stride == 0) | |
54 | { | |
55 | source->dim[0].stride = 1; | |
56 | return source->data; | |
57 | } | |
58 | ||
59 | dim = GFC_DESCRIPTOR_RANK (source); | |
60 | ssize = 1; | |
61 | packed = 1; | |
62 | for (n = 0; n < dim; n++) | |
63 | { | |
64 | count[n] = 0; | |
65 | stride[n] = source->dim[n].stride; | |
66 | extent[n] = source->dim[n].ubound + 1 - source->dim[n].lbound; | |
67 | if (extent[n] <= 0) | |
68 | { | |
69 | /* Do nothing. */ | |
70 | packed = 1; | |
71 | break; | |
72 | } | |
73 | ||
74 | if (ssize != stride[n]) | |
75 | packed = 0; | |
76 | ||
77 | ssize *= extent[n]; | |
78 | } | |
79 | ||
80 | if (packed) | |
81 | return source->data; | |
82 | ||
83 | /* Allocate storage for the destination. */ | |
84 | destptr = (rtype_name *)internal_malloc_size (ssize * rtype_kind); | |
85 | dest = destptr; | |
86 | src = source->data; | |
87 | stride0 = stride[0]; | |
88 | ||
89 | ||
90 | while (src) | |
91 | { | |
92 | /* Copy the data. */ | |
93 | *(dest++) = *src; | |
94 | /* Advance to the next element. */ | |
95 | src += stride0; | |
96 | count[0]++; | |
97 | /* Advance to the next source element. */ | |
98 | n = 0; | |
99 | while (count[n] == extent[n]) | |
100 | { | |
101 | /* When we get to the end of a dimension, reset it and increment | |
102 | the next dimension. */ | |
103 | count[n] = 0; | |
104 | /* We could precalculate these products, but this is a less | |
105 | frequently used path so proabably not worth it. */ | |
106 | src -= stride[n] * extent[n]; | |
107 | n++; | |
108 | if (n == dim) | |
109 | { | |
110 | src = NULL; | |
111 | break; | |
112 | } | |
113 | else | |
114 | { | |
115 | count[n]++; | |
116 | src += stride[n]; | |
117 | } | |
118 | } | |
119 | } | |
120 | return destptr; | |
121 | } | |
122 |