41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
/* High precision, low overhead timing functions. x86-64 version.
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Copyright (C) 2002, 2004, 2005 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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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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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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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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#ifndef _HP_TIMING_H
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/* We can use some of the i686 implementation without changes. */
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# include <sysdeps/i386/i686/hp-timing.h>
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/* The "=A" constraint used in 32-bit mode does not work in 64-bit mode. */
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# undef HP_TIMING_NOW
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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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/* The funny business for 32-bit mode is not required here. */
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# undef HP_TIMING_ACCUM
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# define HP_TIMING_ACCUM(Sum, Diff) \
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do { \
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hp_timing_t __diff = (Diff) - GLRO(dl_hp_timing_overhead); \
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__asm__ __volatile__ ("lock; addq %1, %0" \
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: "=m" (Sum) : "r" (__diff), "m" (Sum)); \
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} while (0)
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#endif /* hp-timing.h */
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