[thirdparty/glibc.git] / sysdeps / ia64 / hp-timing.h

/* High precision, low overhead timing functions.  IA-64 version.
   Copyright (C) 2001-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 2001.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _HP_TIMING_H
#define _HP_TIMING_H	1

/* We always assume having the timestamp register.  */
#define HP_TIMING_AVAIL		(1)
#define HP_SMALL_TIMING_AVAIL	(1)

/* We indeed have inlined functions.  */
#define HP_TIMING_INLINE	(1)

/* We use 64bit values for the times.  */
typedef unsigned long int hp_timing_t;

/* The Itanium/Merced has a bug where the ar.itc register value read
   is not correct in some situations.  The solution is to read again.
   For now we always do this until we know how to recognize a fixed
   processor implementation.  */
#define REPEAT_READ(val) __builtin_expect ((long int) val == -1, 0)

/* That's quite simple.  Use the `ar.itc' instruction.  */
#define HP_TIMING_NOW(Var) \
  ({ unsigned long int __itc;						      \
     do									      \
       asm volatile ("mov %0=ar.itc" : "=r" (__itc) : : "memory");	      \
     while (REPEAT_READ (__itc));					      \
     Var = __itc; })

#include <hp-timing-common.h>

#endif	/* hp-timing.h */
Commit	Line	Data
d5efd131	1	/* High precision, low overhead timing functions. IA-64 version.
f7a9f785	2	Copyright (C) 2001-2016 Free Software Foundation, Inc.
d5efd131 MF	3	This file is part of the GNU C Library.
	4	Contributed by Ulrich Drepper <drepper@cygnus.com>, 2001.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public
75efb018 MF	17	License along with the GNU C Library; if not, see
75efb018 MF	18	<http://www.gnu.org/licenses/>. */
d5efd131 MF	19
	20	#ifndef _HP_TIMING_H
	21	#define _HP_TIMING_H 1
	22
d5efd131 MF	23	/* We always assume having the timestamp register. */
d5efd131 MF	24	#define HP_TIMING_AVAIL (1)
05502548	25	#define HP_SMALL_TIMING_AVAIL (1)
d5efd131 MF	26
	27	/* We indeed have inlined functions. */
	28	#define HP_TIMING_INLINE (1)
	29
	30	/* We use 64bit values for the times. */
	31	typedef unsigned long int hp_timing_t;
	32
d5efd131 MF	33	/* The Itanium/Merced has a bug where the ar.itc register value read
	34	is not correct in some situations. The solution is to read again.
	35	For now we always do this until we know how to recognize a fixed
	36	processor implementation. */
	37	#define REPEAT_READ(val) __builtin_expect ((long int) val == -1, 0)
	38
	39	/* That's quite simple. Use the `ar.itc' instruction. */
	40	#define HP_TIMING_NOW(Var) \
	41	({ unsigned long int __itc; \
	42	do \
	43	asm volatile ("mov %0=ar.itc" : "=r" (__itc) : : "memory"); \
	44	while (REPEAT_READ (__itc)); \
	45	Var = __itc; })
	46
86e1a7ff	47	#include <hp-timing-common.h>
d5efd131 MF	48
d5efd131 MF	49	#endif /* hp-timing.h */