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/* High precision, low overhead timing functions. x86 version.
Copyright (C) 2018 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
<http://www.gnu.org/licenses/>. */
#ifndef _HP_TIMING_H
#define _HP_TIMING_H 1
#include <isa.h>
#if MINIMUM_ISA == 686 || MINIMUM_ISA == 8664
# include <x86intrin.h>
/* We always assume having the timestamp register. */
# define HP_TIMING_AVAIL (1)
# define HP_SMALL_TIMING_AVAIL (1)
/* We indeed have inlined functions. */
# define HP_TIMING_INLINE (1)
/* We use 64bit values for the times. */
typedef unsigned long long int hp_timing_t;
/* That's quite simple. Use the `rdtsc' instruction. Note that the value
might not be 100% accurate since there might be some more instructions
running in this moment. This could be changed by using a barrier like
'cpuid' right before the `rdtsc' instruciton. But we are not interested
in accurate clock cycles here so we don't do this. */
# define HP_TIMING_NOW(Var) ((Var) = _rdtsc ())
# include <hp-timing-common.h>
#else
/* NB: Undefine _HP_TIMING_H so that <sysdeps/generic/hp-timing.h> will
be included. */
# undef _HP_TIMING_H
# include <sysdeps/generic/hp-timing.h>
#endif
#endif /* hp-timing.h */
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