1 /* 2 * This file is part of ltrace. 3 * Copyright (C) 2013 Petr Machata, Red Hat Inc. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of the 8 * License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 18 * 02110-1301 USA 19 */ 20 21 #include "bits.h" 22 23 /* This is called rarely, and any overhead will be lost in ptrace 24 * noise, so the algorithm doesn't need to be terribly clever. For 25 * the same reason we don't bother defining the corresponding _32 26 * variant. */ 27 unsigned 28 bitcount(uint64_t u) 29 { 30 int c = 0; 31 for (; u > 0; u &= u - 1) 32 c++; 33 return c; 34 } 35
