diff options
| -rw-r--r-- | posix/sched_cpucount.c | 40 | ||||
| -rw-r--r-- | sysdeps/i386/i686/multiarch/sched_cpucount.c | 1 | ||||
| -rw-r--r-- | sysdeps/ia64/sched_cpucount.c | 20 | ||||
| -rw-r--r-- | sysdeps/powerpc/sched_cpucount.c | 22 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/sched_cpucount.c | 36 | ||||
| -rw-r--r-- | sysdeps/x86_64/sched_cpucount.c | 25 |
6 files changed, 14 insertions, 130 deletions
diff --git a/posix/sched_cpucount.c b/posix/sched_cpucount.c index b0ca4ea..63d0e99 100644 --- a/posix/sched_cpucount.c +++ b/posix/sched_cpucount.c @@ -17,36 +17,24 @@ #include <sched.h> +/* Counting bits set, Brian Kernighan's way. + Using a open-coded routine is slight better for architectures that + do not have a popcount instruction (compiler might emit a library + call). */ +static inline int +countbits (__cpu_mask v) +{ + int s = 0; + for (; v != 0; s++) + v &= v - 1; + return s; +} 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; - - _Static_assert (sizeof (l) == sizeof (unsigned int) - || sizeof (l) == sizeof (unsigned long) - || sizeof (l) == sizeof (unsigned long long), - "sizeof (__cpu_mask"); - if (sizeof (__cpu_mask) == sizeof (unsigned int)) - s += __builtin_popcount (l); - else if (sizeof (__cpu_mask) == sizeof (unsigned long)) - s += __builtin_popcountl (l); - else - s += __builtin_popcountll (l); -#endif - } - + for (int i = 0; i < setsize / sizeof (__cpu_mask); i++) + s += countbits (setp->__bits[i]); return s; } diff --git a/sysdeps/i386/i686/multiarch/sched_cpucount.c b/sysdeps/i386/i686/multiarch/sched_cpucount.c deleted file mode 100644 index 7db31b0..0000000 --- a/sysdeps/i386/i686/multiarch/sched_cpucount.c +++ /dev/null @@ -1 +0,0 @@ -#include <sysdeps/x86_64/multiarch/sched_cpucount.c> diff --git a/sysdeps/ia64/sched_cpucount.c b/sysdeps/ia64/sched_cpucount.c deleted file mode 100644 index 8440864..0000000 --- a/sysdeps/ia64/sched_cpucount.c +++ /dev/null @@ -1,20 +0,0 @@ -/* Copyright (C) 2007-2021 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 - <https://www.gnu.org/licenses/>. */ - -#define POPCNT(l) __builtin_popcountl (l) - -#include <posix/sched_cpucount.c> diff --git a/sysdeps/powerpc/sched_cpucount.c b/sysdeps/powerpc/sched_cpucount.c deleted file mode 100644 index 8f00e3d..0000000 --- a/sysdeps/powerpc/sched_cpucount.c +++ /dev/null @@ -1,22 +0,0 @@ -/* Copyright (C) 2007-2021 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 - <https://www.gnu.org/licenses/>. */ - -#ifdef _ARCH_PWR5 -# define POPCNT(l) __builtin_popcountl (l) -#endif - -#include <posix/sched_cpucount.c> diff --git a/sysdeps/x86_64/multiarch/sched_cpucount.c b/sysdeps/x86_64/multiarch/sched_cpucount.c deleted file mode 100644 index 5180a11..0000000 --- a/sysdeps/x86_64/multiarch/sched_cpucount.c +++ /dev/null @@ -1,36 +0,0 @@ -/* Count bits in CPU set. x86-64 multi-arch version. - This file is part of the GNU C Library. - Copyright (C) 2008-2021 Free Software Foundation, Inc. - Contributed by Ulrich Drepper <drepper@redhat.com>. - - 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 - <https://www.gnu.org/licenses/>. */ - -#include <sched.h> -#include "init-arch.h" - -#define __sched_cpucount static generic_cpucount -#include <posix/sched_cpucount.c> -#undef __sched_cpucount - -#define POPCNT(l) \ - ({ __cpu_mask r; \ - asm ("popcnt %1, %0" : "=r" (r) : "0" (l));\ - r; }) -#define __sched_cpucount static popcount_cpucount -#include <posix/sched_cpucount.c> -#undef __sched_cpucount - -libc_ifunc (__sched_cpucount, - CPU_FEATURE_USABLE (POPCNT) ? popcount_cpucount : generic_cpucount); diff --git a/sysdeps/x86_64/sched_cpucount.c b/sysdeps/x86_64/sched_cpucount.c deleted file mode 100644 index 5a27336..0000000 --- a/sysdeps/x86_64/sched_cpucount.c +++ /dev/null @@ -1,25 +0,0 @@ -/* Copyright (C) 2007-2021 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 - <https://www.gnu.org/licenses/>. */ - -#ifdef __amdfam10 -# define POPCNT(l) \ - ({ __cpu_mask r; \ - asm ("popcntq %1, %0" : "=r" (r) : "0" (l)); \ - r; }) -#endif - -#include <posix/sched_cpucount.c> |