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commit 72771e53753647111d31c5c4bf43d8901e6baf7e
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Wed Oct 17 15:16:38 2018 -0700
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x86: Use _rdtsc intrinsic for HP_TIMING_NOW
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Since _rdtsc intrinsic is supported in GCC 4.9, we can use it for
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HP_TIMING_NOW. This patch
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1. Create x86 hp-timing.h to replace i686 and x86_64 hp-timing.h.
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2. Move MINIMUM_ISA from init-arch.h to isa.h so that x86 hp-timing.h
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can check minimum x86 ISA to decide if _rdtsc can be used.
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NB: Checking if __i686__ isn't sufficient since __i686__ may not be
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defined when building for i686 class processors.
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* sysdeps/i386/init-arch.h: Removed.
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* sysdeps/i386/i586/init-arch.h: Likewise.
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* sysdeps/i386/i686/init-arch.h: Likewise.
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* sysdeps/i386/i686/hp-timing.h: Likewise.
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* sysdeps/x86_64/hp-timing.h: Likewise.
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* sysdeps/i386/isa.h: New file.
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* sysdeps/i386/i586/isa.h: Likewise.
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* sysdeps/i386/i686/isa.h: Likewise.
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* sysdeps/x86_64/isa.h: Likewise.
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* sysdeps/x86/hp-timing.h: New file.
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* sysdeps/x86/init-arch.h: Include <isa.h>.
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diff --git a/sysdeps/i386/i586/init-arch.h b/sysdeps/i386/i586/isa.h
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similarity index 85%
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rename from sysdeps/i386/i586/init-arch.h
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rename to sysdeps/i386/i586/isa.h
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index 72fb46c61e4c5f34..79481ce68033e58c 100644
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--- a/sysdeps/i386/i586/init-arch.h
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+++ b/sysdeps/i386/i586/isa.h
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@@ -1,4 +1,5 @@
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-/* Copyright (C) 2015-2018 Free Software Foundation, Inc.
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+/* x86 ISA info. i586 version.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@@ -15,5 +16,9 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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+#ifndef _ISA_H
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+#define _ISA_H
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+
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#define MINIMUM_ISA 586
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-#include <sysdeps/x86/init-arch.h>
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+
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+#endif
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diff --git a/sysdeps/i386/i686/init-arch.h b/sysdeps/i386/i686/isa.h
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similarity index 85%
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rename from sysdeps/i386/i686/init-arch.h
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rename to sysdeps/i386/i686/isa.h
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index ab99392b586b1e2d..584e26bd4f928021 100644
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--- a/sysdeps/i386/i686/init-arch.h
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+++ b/sysdeps/i386/i686/isa.h
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@@ -1,4 +1,5 @@
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-/* Copyright (C) 2015-2018 Free Software Foundation, Inc.
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+/* x86 ISA info. i686 version.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@@ -15,5 +16,9 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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+#ifndef _ISA_H
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+#define _ISA_H
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+
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#define MINIMUM_ISA 686
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-#include <sysdeps/x86/init-arch.h>
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+
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+#endif
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diff --git a/sysdeps/i386/init-arch.h b/sysdeps/i386/isa.h
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similarity index 85%
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rename from sysdeps/i386/init-arch.h
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rename to sysdeps/i386/isa.h
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index 043089ceb99db33f..e0a1e9c84fd37efb 100644
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--- a/sysdeps/i386/init-arch.h
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+++ b/sysdeps/i386/isa.h
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@@ -1,4 +1,5 @@
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-/* Copyright (C) 2015-2018 Free Software Foundation, Inc.
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+/* x86 ISA info. i486 version.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@@ -15,5 +16,9 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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+#ifndef _ISA_H
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+#define _ISA_H
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+
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#define MINIMUM_ISA 486
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-#include <sysdeps/x86/init-arch.h>
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+
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+#endif
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diff --git a/sysdeps/i386/i686/hp-timing.h b/sysdeps/x86/hp-timing.h
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similarity index 69%
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rename from sysdeps/i386/i686/hp-timing.h
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rename to sysdeps/x86/hp-timing.h
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index 59af526fdba0b6f5..1c20e9d8289cc15b 100644
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--- a/sysdeps/i386/i686/hp-timing.h
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+++ b/sysdeps/x86/hp-timing.h
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@@ -1,7 +1,6 @@
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-/* High precision, low overhead timing functions. i686 version.
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- Copyright (C) 1998-2018 Free Software Foundation, Inc.
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+/* High precision, low overhead timing functions. x86 version.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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- Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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@@ -20,12 +19,17 @@
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#ifndef _HP_TIMING_H
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#define _HP_TIMING_H 1
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+#include <isa.h>
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+
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+#if MINIMUM_ISA == 686 || MINIMUM_ISA == 8664
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+# include <x86intrin.h>
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+
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/* We always assume having the timestamp register. */
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-#define HP_TIMING_AVAIL (1)
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-#define HP_SMALL_TIMING_AVAIL (1)
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+# define HP_TIMING_AVAIL (1)
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+# define HP_SMALL_TIMING_AVAIL (1)
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/* We indeed have inlined functions. */
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-#define HP_TIMING_INLINE (1)
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+# define HP_TIMING_INLINE (1)
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/* We use 64bit values for the times. */
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typedef unsigned long long int hp_timing_t;
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@@ -35,8 +39,14 @@ typedef unsigned long long int hp_timing_t;
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running in this moment. This could be changed by using a barrier like
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'cpuid' right before the `rdtsc' instruciton. But we are not interested
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in accurate clock cycles here so we don't do this. */
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-#define HP_TIMING_NOW(Var) __asm__ __volatile__ ("rdtsc" : "=A" (Var))
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+# define HP_TIMING_NOW(Var) ((Var) = _rdtsc ())
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-#include <hp-timing-common.h>
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+# include <hp-timing-common.h>
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+#else
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+/* NB: Undefine _HP_TIMING_H so that <sysdeps/generic/hp-timing.h> will
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+ be included. */
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+# undef _HP_TIMING_H
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+# include <sysdeps/generic/hp-timing.h>
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+#endif
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-#endif /* hp-timing.h */
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+#endif /* hp-timing.h */
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diff --git a/sysdeps/x86/init-arch.h b/sysdeps/x86/init-arch.h
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index a81ca8a4eb292e72..bc860fcd69a605b3 100644
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--- a/sysdeps/x86/init-arch.h
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+++ b/sysdeps/x86/init-arch.h
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@@ -21,6 +21,7 @@
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# include <ldsodefs.h>
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#endif
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#include <ifunc-init.h>
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+#include <isa.h>
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#ifndef __x86_64__
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/* Due to the reordering and the other nifty extensions in i686, it is
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diff --git a/sysdeps/x86_64/hp-timing.h b/sysdeps/x86_64/hp-timing.h
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deleted file mode 100644
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index ec543bef03b6c2d1..0000000000000000
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--- a/sysdeps/x86_64/hp-timing.h
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+++ /dev/null
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@@ -1,40 +0,0 @@
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-/* High precision, low overhead timing functions. x86-64 version.
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- Copyright (C) 2002-2018 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Lesser General Public License for more details.
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-
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- You should have received a copy of the GNU Lesser General Public
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- License along with the GNU C Library; if not, see
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- <http://www.gnu.org/licenses/>. */
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-
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-#ifndef _HP_TIMING_H
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-#define _HP_TIMING_H 1
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-
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-/* We always assume having the timestamp register. */
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-#define HP_TIMING_AVAIL (1)
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-#define HP_SMALL_TIMING_AVAIL (1)
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-
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-/* We indeed have inlined functions. */
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-#define HP_TIMING_INLINE (1)
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-
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-/* We use 64bit values for the times. */
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-typedef unsigned long long int hp_timing_t;
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-
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-/* The "=A" constraint used in 32-bit mode does not work in 64-bit mode. */
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-#define HP_TIMING_NOW(Var) \
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- ({ unsigned int _hi, _lo; \
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- asm volatile ("rdtsc" : "=a" (_lo), "=d" (_hi)); \
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- (Var) = ((unsigned long long int) _hi << 32) | _lo; })
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-
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-#include <hp-timing-common.h>
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-
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-#endif /* hp-timing.h */
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diff --git a/sysdeps/x86_64/isa.h b/sysdeps/x86_64/isa.h
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new file mode 100644
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index 0000000000000000..452bce75eb03a474
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--- /dev/null
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+++ b/sysdeps/x86_64/isa.h
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@@ -0,0 +1,24 @@
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+/* x86 ISA info. x86-64 version.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#ifndef _ISA_H
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+#define _ISA_H
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+
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+#define MINIMUM_ISA 8664
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+
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+#endif
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