diff options
author | H.J. Lu <hjl.tools@gmail.com> | 2018-10-17 15:16:38 -0700 |
---|---|---|
committer | H.J. Lu <hjl.tools@gmail.com> | 2018-10-17 15:16:45 -0700 |
commit | 72771e53753647111d31c5c4bf43d8901e6baf7e (patch) | |
tree | 66c4a0605d4624372f8e6742bf0c417ceaba8d43 /sysdeps/i386/i686/hp-timing.h | |
parent | c2b7ccad93d6361eba91755e8f0c92e97c76e854 (diff) | |
download | glibc-72771e53753647111d31c5c4bf43d8901e6baf7e.tar.gz glibc-72771e53753647111d31c5c4bf43d8901e6baf7e.tar.xz glibc-72771e53753647111d31c5c4bf43d8901e6baf7e.zip |
x86: Use _rdtsc intrinsic for HP_TIMING_NOW
Since _rdtsc intrinsic is supported in GCC 4.9, we can use it for HP_TIMING_NOW. This patch 1. Create x86 hp-timing.h to replace i686 and x86_64 hp-timing.h. 2. Move MINIMUM_ISA from init-arch.h to isa.h so that x86 hp-timing.h can check minimum x86 ISA to decide if _rdtsc can be used. NB: Checking if __i686__ isn't sufficient since __i686__ may not be defined when building for i686 class processors. * sysdeps/i386/init-arch.h: Removed. * sysdeps/i386/i586/init-arch.h: Likewise. * sysdeps/i386/i686/init-arch.h: Likewise. * sysdeps/i386/i686/hp-timing.h: Likewise. * sysdeps/x86_64/hp-timing.h: Likewise. * sysdeps/i386/isa.h: New file. * sysdeps/i386/i586/isa.h: Likewise. * sysdeps/i386/i686/isa.h: Likewise. * sysdeps/x86_64/isa.h: Likewise. * sysdeps/x86/hp-timing.h: New file. * sysdeps/x86/init-arch.h: Include <isa.h>.
Diffstat (limited to 'sysdeps/i386/i686/hp-timing.h')
-rw-r--r-- | sysdeps/i386/i686/hp-timing.h | 42 |
1 files changed, 0 insertions, 42 deletions
diff --git a/sysdeps/i386/i686/hp-timing.h b/sysdeps/i386/i686/hp-timing.h deleted file mode 100644 index 59af526fdb..0000000000 --- a/sysdeps/i386/i686/hp-timing.h +++ /dev/null @@ -1,42 +0,0 @@ -/* High precision, low overhead timing functions. i686 version. - Copyright (C) 1998-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. - - 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 - -/* 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) __asm__ __volatile__ ("rdtsc" : "=A" (Var)) - -#include <hp-timing-common.h> - -#endif /* hp-timing.h */ |