From 72771e53753647111d31c5c4bf43d8901e6baf7e Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Wed, 17 Oct 2018 15:16:38 -0700 Subject: 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 . --- sysdeps/i386/i686/hp-timing.h | 42 ------------------------------------------ sysdeps/i386/i686/init-arch.h | 19 ------------------- sysdeps/i386/i686/isa.h | 24 ++++++++++++++++++++++++ 3 files changed, 24 insertions(+), 61 deletions(-) delete mode 100644 sysdeps/i386/i686/hp-timing.h delete mode 100644 sysdeps/i386/i686/init-arch.h create mode 100644 sysdeps/i386/i686/isa.h (limited to 'sysdeps/i386/i686') 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 , 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 - . */ - -#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 - -#endif /* hp-timing.h */ diff --git a/sysdeps/i386/i686/init-arch.h b/sysdeps/i386/i686/init-arch.h deleted file mode 100644 index ab99392b58..0000000000 --- a/sysdeps/i386/i686/init-arch.h +++ /dev/null @@ -1,19 +0,0 @@ -/* Copyright (C) 2015-2018 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 - . */ - -#define MINIMUM_ISA 686 -#include diff --git a/sysdeps/i386/i686/isa.h b/sysdeps/i386/i686/isa.h new file mode 100644 index 0000000000..584e26bd4f --- /dev/null +++ b/sysdeps/i386/i686/isa.h @@ -0,0 +1,24 @@ +/* x86 ISA info. i686 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 + . */ + +#ifndef _ISA_H +#define _ISA_H + +#define MINIMUM_ISA 686 + +#endif -- cgit 1.4.1