1 /* _mulsi3 for Lattice Mico32.
2 Contributed by Jon Beniston <jon@beniston.com>
3
4 Copyright (C) 2009-2021 Free Software Foundation, Inc.
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
__mulsi3(USItype a,USItype b)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 }
49