1  /* Generic 32 bit multiply.
       2     Copyright (C) 2009-2023 Free Software Foundation, Inc.
       3     Contributed by Embecosm on behalf of Adapteva, Inc.
       4  
       5  This file is part of GCC.
       6  
       7  This file is free software; you can redistribute it and/or modify it
       8  under the terms of the GNU General Public License as published by the
       9  Free Software Foundation; either version 3, or (at your option) any
      10  later version.
      11  
      12  This file is distributed in the hope that it will be useful, but
      13  WITHOUT ANY WARRANTY; without even the implied warranty of
      14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15  General Public 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  
      26  unsigned int
      27  __mulsi3 (unsigned int a, unsigned int b)
      28  {
      29    unsigned int r = 0;
      30  
      31    while (a)
      32      {
      33        if (a & 1)
      34  	r += b;
      35        a >>= 1;
      36        b <<= 1;
      37      }
      38    return r;
      39  }