1 /* ffsll.c -- version of ffsll for gold. */ 2 3 /* Copyright (C) 2009-2014 Free Software Foundation, Inc. 4 Written by Ian Lance Taylor <iant (at) google.com>. 5 6 This file is part of gold. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "config.h" 24 25 #include <string.h> 26 27 extern int ffsll (long long); 28 29 /* This file implements ffsll for systems which don't have it. We use 30 ffsll if possible because gcc supports it as a builtin which will 31 use a machine instruction if there is one. */ 32 33 int 34 ffsll (long long arg) 35 { 36 unsigned long long i; 37 int ret; 38 39 if (arg == 0) 40 ret = 0; 41 else 42 { 43 ret = 1; 44 for (i = (unsigned long long) arg; (i & 1) == 0; i >>= 1) 45 ++ret; 46 } 47 return ret; 48 } 49
