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/* _mulsi3 for Lattice Mico32.
   Contributed by Jon Beniston <jon@beniston.com> 
 
   Copyright (C) 2009 Free Software Foundation, Inc.
 
   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/>. */
 
#include "libgcc_lm32.h"
 
/* Integer multiplication.  */
 
USItype
__mulsi3 (USItype a, USItype b)
{
  USItype result;
 
  result = 0;
 
  if (a == 0)
    return 0;
 
  while (b != 0)
    {
      if (b & 1)
	result += a;
      a <<= 1;
      b >>= 1;
    }
 
  return result;
}