1/* libgcc routines for RL78
2   Copyright (C) 2005-2020 Free Software Foundation, Inc.
3   Contributed by Red Hat.
4
5   This file is part of GCC.
6
7   GCC is free software; you can redistribute it and/or modify it
8   under the terms of the GNU General Public License as published
9   by the Free Software Foundation; either version 3, or (at your
10   option) any later version.
11
12   GCC is distributed in the hope that it will be useful, but WITHOUT
13   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
15   License for more details.
16
17   Under Section 7 of GPL version 3, you are granted additional
18   permissions described in the GCC Runtime Library Exception, version
19   3.1, as published by the Free Software Foundation.
20
21   You should have received a copy of the GNU General Public License and
22   a copy of the GCC Runtime Library Exception along with this program;
23   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24   <http://www.gnu.org/licenses/>.  */
25
26UINT_TYPE C3(__mul,NAME_MODE,3)   (UINT_TYPE, UINT_TYPE);
27UINT_TYPE
28C3(__mul,NAME_MODE,3) (UINT_TYPE a, UINT_TYPE b)
29{
30  UINT_TYPE rv = 0;
31
32  char bit;
33
34  for (bit=0; b && bit<sizeof(UINT_TYPE)*8; bit++)
35    {
36      if (b & 1)
37	rv += a;
38      a <<= 1;
39      b >>= 1;
40    }
41  return rv;
42}
43