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Hi! alpha (ev67), ia64 and powerpc (power5 and later) implement popcount in hardware. For alpha I have used inline assembly, because __builtin_popcount would only expand to ctpop if the selected gcc arch is ev67, which isn't sure. Calling libgcc function there is not a good idea. On ia64 we can use it unconditionally, for ppc only for power5 and later, but inline asm would be larger there, so I use the builtin guarded with predefined macro for power5 and later. glibc build supports only GCC 3.4 and later, so __builtin_popcountl is supported. 2007-07-17 Jakub Jelinek <jakub@redhat.com> * sysdeps/alpha/alphaev67/sched_cpucount.c: New file. * sysdeps/ia64/sched_cpucount.c: New file. * sysdeps/powerpc/sched_cpucount.c: New file. --- libc/sysdeps/alpha/alphaev67/sched_cpucount.c.jj 2007-07-17 22:21:33.000000000 +0200 +++ libc/sysdeps/alpha/alphaev67/sched_cpucount.c 2007-07-17 22:22:37.000000000 +0200 @@ -0,0 +1,24 @@ +/* Copyright (C) 2007 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#define POPCNT(l) \ + ({ __cpu_mask r; \ + asm ("ctpop %1, %0" : "=r" (r) : "0" (l)); \ + r; }) + +#include <posix/sched_cpucount.c> --- libc/sysdeps/ia64/sched_cpucount.c.jj 2007-07-17 22:21:33.000000000 +0200 +++ libc/sysdeps/ia64/sched_cpucount.c 2007-07-17 22:25:50.000000000 +0200 @@ -0,0 +1,21 @@ +/* Copyright (C) 2007 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#define POPCNT(l) __builtin_popcountl (l) + +#include <posix/sched_cpucount.c> --- libc/sysdeps/powerpc/sched_cpucount.c.jj 2007-07-17 22:21:33.000000000 +0200 +++ libc/sysdeps/powerpc/sched_cpucount.c 2007-07-17 22:34:26.000000000 +0200 @@ -0,0 +1,23 @@ +/* Copyright (C) 2007 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifdef _ARCH_PWR5 +# define POPCNT(l) __builtin_popcountl (l) +#endif + +#include <posix/sched_cpucount.c> Jakub
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