/* High precision, low overhead timing functions. x86-64 version. Copyright (C) 2002, 2004, 2005 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. */ #ifndef _HP_TIMING_H /* We can use some of the i686 implementation without changes. */ # include /* The "=A" constraint used in 32-bit mode does not work in 64-bit mode. */ # undef HP_TIMING_NOW # define HP_TIMING_NOW(Var) \ ({ unsigned int _hi, _lo; \ asm volatile ("rdtsc" : "=a" (_lo), "=d" (_hi)); \ (Var) = ((unsigned long long int) _hi << 32) | _lo; }) /* The funny business for 32-bit mode is not required here. */ # undef HP_TIMING_ACCUM # define HP_TIMING_ACCUM(Sum, Diff) \ do { \ hp_timing_t __diff = (Diff) - GLRO(dl_hp_timing_overhead); \ __asm__ __volatile__ ("lock; addq %1, %0" \ : "=m" (Sum) : "r" (__diff), "m" (Sum)); \ } while (0) #endif /* hp-timing.h */