sysdeps/x86_64/multiarch/sched_cpucount.c

   1 /* Count bits in CPU set.  x86-64 multi-arch version.
   2    This file is part of the GNU C Library.
   3    Copyright (C) 2008-2019 Free Software Foundation, Inc.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>.
   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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sched.h>
  21 #include "init-arch.h"
  22
  23 #define __sched_cpucount static generic_cpucount
  24 #include <posix/sched_cpucount.c>
  25 #undef __sched_cpucount
  26
  27 #define POPCNT(l) \
  28   ({ __cpu_mask r; \
  29      asm ("popcnt %1, %0" : "=r" (r) : "0" (l));\
  30      r; })
  31 #define __sched_cpucount static popcount_cpucount
  32 #include <posix/sched_cpucount.c>
  33 #undef __sched_cpucount
  34
  35 libc_ifunc (__sched_cpucount,
  36             HAS_CPU_FEATURE (POPCNT) ? popcount_cpucount : generic_cpucount);