Mercurial > hg > CbC > CbC_gcc
comparison libgcc/config/lm32/_mulsi3.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Fri, 12 Feb 2010 23:39:51 +0900 |
parents | |
children | 04ced10e8804 |
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52:c156f1bd5cd9 | 55:77e2b8dfacca |
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1 /* _mulsi3 for Lattice Mico32. | |
2 Contributed by Jon Beniston <jon@beniston.com> | |
3 | |
4 Copyright (C) 2009 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 | |
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 } |