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Peter W. Draper authoredPeter W. Draper authored
cycle.h 4.79 KiB
/*
* Copyright (c) 2003, 2007-14 Matteo Frigo
* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
/* machine-dependent cycle counters code. Needs to be inlined. */
/***************************************************************************/
/* To use the cycle counters in your code, simply #include "cycle.h" (this
file), and then use the functions/macros:
ticks getticks(void);
ticks is an opaque typedef defined below, representing the current time.
You extract the elapsed time between two calls to gettick() via:
double elapsed(ticks t1, ticks t0);
which returns a double-precision variable in arbitrary units. You
are not expected to convert this into human units like seconds; it
is intended only for *comparisons* of time intervals.
(In order to use some of the OS-dependent timer routines like
Solaris' gethrtime, you need to paste the autoconf snippet below
into your configure.ac file and #include "config.h" before cycle.h,
or define the relevant macros manually if you are not using autoconf.)
*/
/***************************************************************************/
/* This file uses macros like HAVE_GETHRTIME that are assumed to be
defined according to whether the corresponding function/type/header
is available on your system. The necessary macros are most
conveniently defined if you are using GNU autoconf, via the tests:
dnl ---------------------------------------------------------------------
AC_C_INLINE
AC_HEADER_TIME
AC_CHECK_HEADERS([sys/time.h c_asm.h intrinsics.h mach/mach_time.h])
AC_CHECK_TYPE([hrtime_t],[AC_DEFINE(HAVE_HRTIME_T, 1, [Define to 1 if
hrtime_t is defined in <sys/time.h>])],,[#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif])
AC_CHECK_FUNCS([gethrtime read_real_time time_base_to_time clock_gettime
mach_absolute_time])
dnl Cray UNICOS _rtc() (real-time clock) intrinsic
AC_MSG_CHECKING([for _rtc intrinsic])
rtc_ok=yes
AC_TRY_LINK([#ifdef HAVE_INTRINSICS_H
#include <intrinsics.h>
#endif], [_rtc()], [AC_DEFINE(HAVE__RTC,1,[Define if you have the UNICOS _rtc()
intrinsic.])], [rtc_ok=no])
AC_MSG_RESULT($rtc_ok)
dnl ---------------------------------------------------------------------
*/
/***************************************************************************/
/* Hacked to just use typical Linux setup */
#define HAVE_SYS_TIME_H 1
#define TIME_WITH_SYS_TIME 1
#include <stdint.h>
#if TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
#define INLINE_ELAPSED(INL) \
static INL double elapsed(ticks t1, ticks t0) { \
return (double)t1 - (double)t0; \
}
/*----------------------------------------------------------------*/
/*
* Pentium cycle counter
*/
#if (defined(__GNUC__) || defined(__ICC)) && defined(__i386__) && \
!defined(HAVE_TICK_COUNTER)
typedef unsigned long long ticks;
static __inline__ ticks getticks(void) {
ticks ret;
__asm__ __volatile__("rdtsc" : "=A"(ret));
/* no input, nothing else clobbered */
return ret;
}
INLINE_ELAPSED(__inline__)
#define HAVE_TICK_COUNTER
#define TIME_MIN 5000.0 /* unreliable pentium IV cycle counter */
#endif
/*----------------------------------------------------------------*/
/*
* X86-64 cycle counter
*/
#if (defined(__GNUC__) || defined(__ICC) || defined(__SUNPRO_C)) && \
defined(__x86_64__) && !defined(HAVE_TICK_COUNTER)
typedef unsigned long long ticks;
static __inline__ ticks getticks(void) {
unsigned a, d;
__asm__ __volatile__("rdtsc" : "=a"(a), "=d"(d));
return ((ticks)a) | (((ticks)d) << 32);
}
INLINE_ELAPSED(__inline__)
#define HAVE_TICK_COUNTER
#define TIME_MIN 5000.0
#endif