libgcc/config/nds32/lib2csrc-mculib/_clzsi2.c

/* mculib libgcc routines of Andes NDS32 cpu for GNU compiler
   Copyright (C) 2012-2021 Free Software Foundation, Inc.
   Contributed by Andes Technology Corporation.

   This file is part of GCC.

   GCC 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.

   GCC 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/>.  */

int
__clzsi2 (int val)
{
  int i = 32;
  int j = 16;
  int temp;

  for (; j; j >>= 1)
    {
      if (temp = val >> j)
	{
	  if (j == 1)
	    {
	      return (i - 2);
	    }
	  else
	    {
	      i -= j;
	      val = temp;
	    }
	}
    }
  return (i - val);
}