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  #ifdef 	__GNUC__
      27  
      28  int
      29  __ffs (int x)
      30  {
      31    int cnt;
      32  
      33    asm ("cntlzw %0,%1" : "=r" (cnt) : "r" (x & -x));
      34    return 32 - cnt;
      35  }
      36  weak_alias (__ffs, ffs)
      37  libc_hidden_def (__ffs)
      38  libc_hidden_builtin_def (ffs)
      39  #if ULONG_MAX == UINT_MAX
      40  #undef ffsl
      41  weak_alias (__ffs, ffsl)
      42  #endif
      43  
      44  #else
      45  #include <string/ffs.c>
      46  #endif