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47 lines
1.8 KiB
C
47 lines
1.8 KiB
C
/* High precision, low overhead timing functions. powerpc64 version.
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Copyright (C) 2005-2018 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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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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#define _HP_TIMING_H 1
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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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/* We indeed have inlined functions. */
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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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/* That's quite simple. Use the `mftb' instruction. Note that the value
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might not be 100% accurate since there might be some more instructions
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running in this moment. This could be changed by using a barrier like
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'lwsync' right before the `mftb' instruction. But we are not interested
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in accurate clock cycles here so we don't do this. */
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#ifdef _ARCH_PWR4
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#define HP_TIMING_NOW(Var) __asm__ __volatile__ ("mfspr %0,268" : "=r" (Var))
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#else
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#define HP_TIMING_NOW(Var) __asm__ __volatile__ ("mftb %0" : "=r" (Var))
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#endif
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#include <hp-timing-common.h>
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#endif /* hp-timing.h */
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