1  /* Find first set bit in a word, counted from least significant end.
       2     For PowerPC.
       3     Copyright (C) 1991-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #define ffsl __something_else
      21  #include <limits.h>
      22  #include <string.h>
      23  
      24  #undef	ffs
      25  
      26  int
      27  __ffsll (long long int x)
      28  {
      29    int cnt;
      30  
      31    asm ("cntlzd %0,%1" : "=r" (cnt) : "r" (x & -x));
      32    return 64 - cnt;
      33  }
      34  weak_alias (__ffsll, ffsll)
      35  #undef ffsl
      36  weak_alias (__ffsll, ffsl)