| /* Copyright (C) 2007-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <limits.h> |
| #include <sched.h> |
| |
| |
| int |
| __sched_cpucount (size_t setsize, const cpu_set_t *setp) |
| { |
| int s = 0; |
| const __cpu_mask *p = setp->__bits; |
| const __cpu_mask *end = &setp->__bits[setsize / sizeof (__cpu_mask)]; |
| |
| while (p < end) |
| { |
| __cpu_mask l = *p++; |
| |
| #ifdef POPCNT |
| s += POPCNT (l); |
| #else |
| if (l == 0) |
| continue; |
| |
| # if LONG_BIT > 32 |
| l = (l & 0x5555555555555555ul) + ((l >> 1) & 0x5555555555555555ul); |
| l = (l & 0x3333333333333333ul) + ((l >> 2) & 0x3333333333333333ul); |
| l = (l & 0x0f0f0f0f0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0f0f0f0f0ful); |
| l = (l & 0x00ff00ff00ff00fful) + ((l >> 8) & 0x00ff00ff00ff00fful); |
| l = (l & 0x0000ffff0000fffful) + ((l >> 16) & 0x0000ffff0000fffful); |
| l = (l & 0x00000000fffffffful) + ((l >> 32) & 0x00000000fffffffful); |
| # else |
| l = (l & 0x55555555ul) + ((l >> 1) & 0x55555555ul); |
| l = (l & 0x33333333ul) + ((l >> 2) & 0x33333333ul); |
| l = (l & 0x0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0ful); |
| l = (l & 0x00ff00fful) + ((l >> 8) & 0x00ff00fful); |
| l = (l & 0x0000fffful) + ((l >> 16) & 0x0000fffful); |
| # endif |
| |
| s += l; |
| #endif |
| } |
| |
| return s; |
| } |