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/* High precision, low overhead timing functions. IA-64 version.
Copyright (C) 2001-2014 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
#include <string.h>
#include <sys/param.h>
#include <_itoa.h>
#include <ia64intrin.h>
/* The macros defined here use the timestamp counter in IA-64. They
provide a very accurate way to measure the time with very little
overhead. The time values themself have no real meaning, only
differences are interesting.
The list of macros we need includes the following:
- HP_TIMING_AVAIL: test for availability.
- HP_TIMING_INLINE: this macro is non-zero if the functionality is not
implemented using function calls but instead uses some inlined code
which might simply consist of a few assembler instructions. We have to
know this since we might want to use the macros here in places where we
cannot make function calls.
- hp_timing_t: This is the type for variables used to store the time
values.
- HP_TIMING_NOW: place timestamp for current time in variable given as
parameter.
- HP_TIMING_DIFF: compute difference between two times and store it
in a third. Source and destination might overlap.
- HP_TIMING_ACCUM_NT: add time difference to another variable, without
being thread-safe.
- HP_TIMING_PRINT: write decimal representation of the timing value into
the given string. This operation need not be inline even though
HP_TIMING_INLINE is specified.
*/
/* We always assume having the timestamp register. */
#define HP_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; })
/* It's simple arithmetic for us. */
#define HP_TIMING_DIFF(Diff, Start, End) (Diff) = ((End) - (Start))
#define HP_TIMING_ACCUM_NT(Sum, Diff) (Sum) += (Diff)
/* Print the time value. */
#define HP_TIMING_PRINT(Buf, Len, Val) \
do { \
char __buf[20]; \
char *__cp = _itoa_word (Val, __buf + sizeof (__buf), 10, 0); \
int __len = (Len); \
char *__dest = (Buf); \
while (__len-- > 0 && __cp < __buf + sizeof (__buf)) \
*__dest++ = *__cp++; \
memcpy (__dest, " clock cycles", MIN (__len, \
(int) sizeof (" clock cycles"))); \
} while (0)
#endif /* hp-timing.h */
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