1 /* Find first set bit in a word, counted from least significant end. 2 For PowerPC. 3 Copyright (C) 1991-2021 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 __ffs(int x)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 47