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aa4945c1 JB |
1 | /* _mulsi3 for Lattice Mico32. |
2 | Contributed by Jon Beniston <jon@beniston.com> | |
3 | ||
99dee823 | 4 | Copyright (C) 2009-2021 Free Software Foundation, Inc. |
aa4945c1 JB |
5 | |
6 | This file is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by the | |
8 | Free Software Foundation; either version 3, or (at your option) any | |
9 | later version. | |
10 | ||
11 | This file is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | General Public License for more details. | |
15 | ||
16 | Under Section 7 of GPL version 3, you are granted additional | |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
24 | ||
25 | #include "libgcc_lm32.h" | |
26 | ||
27 | /* Integer multiplication. */ | |
28 | ||
29 | USItype | |
30 | __mulsi3 (USItype a, USItype b) | |
31 | { | |
32 | USItype result; | |
33 | ||
34 | result = 0; | |
35 | ||
36 | if (a == 0) | |
37 | return 0; | |
38 | ||
39 | while (b != 0) | |
40 | { | |
41 | if (b & 1) | |
42 | result += a; | |
43 | a <<= 1; | |
44 | b >>= 1; | |
45 | } | |
46 | ||
47 | return result; | |
48 | } |