50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/* High precision, low overhead timing functions. IA-64 version.
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Copyright (C) 2001-2014 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 */
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