[BZ #9720]
[glibc.git] / sysdeps / x86_64 / hp-timing.h
blob59a29abd458344631297eb4581b941990fe68165
1 /* High precision, low overhead timing functions. x86-64 version.
2 Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #ifndef _HP_TIMING_H
22 /* We can use some of the i686 implementation without changes. */
23 # include <sysdeps/i386/i686/hp-timing.h>
25 /* The "=A" constraint used in 32-bit mode does not work in 64-bit mode. */
26 # undef HP_TIMING_NOW
27 # define HP_TIMING_NOW(Var) \
28 ({ unsigned int _hi, _lo; \
29 asm volatile ("rdtsc" : "=a" (_lo), "=d" (_hi)); \
30 (Var) = ((unsigned long long int) _hi << 32) | _lo; })
32 /* The funny business for 32-bit mode is not required here. */
33 # undef HP_TIMING_ACCUM
34 # define HP_TIMING_ACCUM(Sum, Diff) \
35 do { \
36 hp_timing_t __diff = (Diff) - GLRO(dl_hp_timing_overhead); \
37 __asm__ __volatile__ ("lock; addq %1, %0" \
38 : "=m" (Sum) : "r" (__diff), "m" (Sum)); \
39 } while (0)
41 #endif /* hp-timing.h */