Blame sysdeps/ia64/hp-timing.h

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/* High precision, low overhead timing functions.  IA-64 version.
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   Copyright (C) 2001-2018 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>, 2001.
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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 int hp_timing_t;
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/* The Itanium/Merced has a bug where the ar.itc register value read
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   is not correct in some situations.  The solution is to read again.
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   For now we always do this until we know how to recognize a fixed
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   processor implementation.  */
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#define REPEAT_READ(val) __builtin_expect ((long int) val == -1, 0)
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/* That's quite simple.  Use the `ar.itc' instruction.  */
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#define HP_TIMING_NOW(Var) \
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  ({ unsigned long int __itc;						      \
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     do									      \
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       asm volatile ("mov %0=ar.itc" : "=r" (__itc) : : "memory");	      \
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     while (REPEAT_READ (__itc));					      \
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     Var = __itc; })
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#include <hp-timing-common.h>
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#endif	/* hp-timing.h */