1/* High precision, low overhead timing functions. x86-64 version.
2 Copyright (C) 2002-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
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.
9
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.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#ifndef _HP_TIMING_H
20#define _HP_TIMING_H 1
21
22/* We always assume having the timestamp register. */
23#define HP_TIMING_AVAIL (1)
24#define HP_SMALL_TIMING_AVAIL (1)
25
26/* We indeed have inlined functions. */
27#define HP_TIMING_INLINE (1)
28
29/* We use 64bit values for the times. */
30typedef unsigned long long int hp_timing_t;
31
32/* The "=A" constraint used in 32-bit mode does not work in 64-bit mode. */
33#define HP_TIMING_NOW(Var) \
34 ({ unsigned int _hi, _lo; \
35 asm volatile ("rdtsc" : "=a" (_lo), "=d" (_hi)); \
36 (Var) = ((unsigned long long int) _hi << 32) | _lo; })
37
38#include <hp-timing-common.h>
39
40#endif /* hp-timing.h */
41