Subversion Repositories openrisc_2011-10-31

/* _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;

}