40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/* Generic 32 bit multiply.
|
|
Copyright (C) 2009-2014 Free Software Foundation, Inc.
|
|
Contributed by Embecosm on behalf of Adapteva, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
This file is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the
|
|
Free Software Foundation; either version 3, or (at your option) any
|
|
later version.
|
|
|
|
This file is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
unsigned int
|
|
__mulsi3 (unsigned int a, unsigned int b)
|
|
{
|
|
unsigned int r = 0;
|
|
|
|
while (a)
|
|
{
|
|
if (a & 1)
|
|
r += b;
|
|
a >>= 1;
|
|
b <<= 1;
|
|
}
|
|
return r;
|
|
}
|