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6de9cd9a DN |
1 | /* Implementation of the DOT_PRODUCT intrinsic |
2 | Copyright 2002 Free Software Foundation, Inc. | |
3 | Contributed by Paul Brook <paul@nowt.org> | |
4 | ||
57dea9f6 | 5 | This file is part of the GNU Fortran 95 runtime library (libgfortran). |
6de9cd9a DN |
6 | |
7 | Libgfortran is free software; you can redistribute it and/or | |
57dea9f6 | 8 | modify it under the terms of the GNU General Public |
6de9cd9a | 9 | License as published by the Free Software Foundation; either |
57dea9f6 TM |
10 | version 2 of the License, or (at your option) any later version. |
11 | ||
12 | In addition to the permissions in the GNU General Public License, the | |
13 | Free Software Foundation gives you unlimited permission to link the | |
14 | compiled version of this file into combinations with other programs, | |
15 | and to distribute those combinations without any restriction coming | |
16 | from the use of this file. (The General Public License restrictions | |
17 | do apply in other respects; for example, they cover modification of | |
18 | the file, and distribution when not linked into a combine | |
19 | executable.) | |
6de9cd9a DN |
20 | |
21 | Libgfortran is distributed in the hope that it will be useful, | |
22 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
57dea9f6 | 24 | GNU General Public License for more details. |
6de9cd9a | 25 | |
57dea9f6 TM |
26 | You should have received a copy of the GNU General Public |
27 | License along with libgfortran; see the file COPYING. If not, | |
6de9cd9a DN |
28 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
29 | Boston, MA 02111-1307, USA. */ | |
30 | ||
31 | #include "config.h" | |
32 | #include <stdlib.h> | |
33 | #include <assert.h> | |
34 | #include "libgfortran.h" | |
35 | ||
36 | typedef GFC_ARRAY_DESCRIPTOR(GFC_MAX_DIMENSIONS, char) char_array; | |
37 | ||
7f68c75f RH |
38 | extern GFC_REAL_8 dot_product_r8 (gfc_array_r8 * a, gfc_array_r8 * b); |
39 | export_proto(dot_product_r8); | |
7d7b8bfe | 40 | |
6de9cd9a DN |
41 | /* Both parameters will already have been converted to the result type. */ |
42 | GFC_REAL_8 | |
7f68c75f | 43 | dot_product_r8 (gfc_array_r8 * a, gfc_array_r8 * b) |
6de9cd9a DN |
44 | { |
45 | GFC_REAL_8 *pa; | |
46 | GFC_REAL_8 *pb; | |
47 | GFC_REAL_8 res; | |
48 | index_type count; | |
49 | index_type astride; | |
50 | index_type bstride; | |
51 | ||
52 | assert (GFC_DESCRIPTOR_RANK (a) == 1 | |
53 | && GFC_DESCRIPTOR_RANK (b) == 1); | |
54 | ||
55 | if (a->dim[0].stride == 0) | |
56 | a->dim[0].stride = 1; | |
57 | if (b->dim[0].stride == 0) | |
58 | b->dim[0].stride = 1; | |
59 | ||
60 | astride = a->dim[0].stride; | |
61 | bstride = b->dim[0].stride; | |
62 | count = a->dim[0].ubound + 1 - a->dim[0].lbound; | |
63 | res = 0; | |
64 | pa = a->data; | |
65 | pb = b->data; | |
66 | ||
67 | while (count--) | |
68 | { | |
69 | res += *pa * *pb; | |
70 | pa += astride; | |
71 | pb += bstride; | |
72 | } | |
73 | ||
74 | return res; | |
75 | } |