mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
/* High precision, low overhead timing functions. x86 version.
|
|
Copyright (C) 2018-2021 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _HP_TIMING_H
|
|
#define _HP_TIMING_H 1
|
|
|
|
#include <isa.h>
|
|
|
|
#if MINIMUM_ISA == 686 || MINIMUM_ISA == 8664
|
|
/* 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.
|
|
|
|
NB: Use __builtin_ia32_rdtsc directly since including <x86intrin.h>
|
|
makes building glibc very slow. */
|
|
# ifdef USE_RDTSCP
|
|
/* RDTSCP waits until all previous instructions have executed and all
|
|
previous loads are globally visible before reading the counter.
|
|
RDTSC doesn't wait until all previous instructions have been executed
|
|
before reading the counter. */
|
|
# define HP_TIMING_NOW(Var) \
|
|
(__extension__ ({ \
|
|
unsigned int __aux; \
|
|
(Var) = __builtin_ia32_rdtscp (&__aux); \
|
|
}))
|
|
# else
|
|
# define HP_TIMING_NOW(Var) ((Var) = __builtin_ia32_rdtsc ())
|
|
# endif
|
|
|
|
# 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 */
|