source: trunk/src/testlib/3rdparty/cycle_p.h@ 561

/*
 * Copyright (c) 2003, 2006 Matteo Frigo
 * Copyright (c) 2003, 2006 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.
 *
 */

/* $Id: cycle.h,v 1.52 2006-02-08 02:36:47 athena Exp $ */

/* 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:

                 CycleCounterTicks getticks(void);

   CycleCounterTicks is an opaque typedef defined below, representing the current time.
   You extract the elapsed time between two calls to gettick() via:

                 double elapsed(CycleCounterTicks t1, CycleCounterTicks 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 ---------------------------------------------------------------------
*/

/***************************************************************************/

#ifndef QBENCHLIB_CYCLE_H
#define QBENCHLIB_CYCLE_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(CycleCounterTicks t1, CycleCounterTicks t0) \
{                                                                         \
     return (double)(t1 - t0);                                            \
}

/*----------------------------------------------------------------*/
/* Solaris */
#if defined(HAVE_GETHRTIME) && defined(HAVE_HRTIME_T) && !defined(HAVE_TICK_COUNTER)
typedef hrtime_t CycleCounterTicks;

#define getticks gethrtime

INLINE_ELAPSED(inline)

#define HAVE_TICK_COUNTER
#endif

/*----------------------------------------------------------------*/
/* AIX v. 4+ routines to read the real-time clock or time-base register */
#if defined(HAVE_READ_REAL_TIME) && defined(HAVE_TIME_BASE_TO_TIME) && !defined(HAVE_TICK_COUNTER)
typedef timebasestruct_t CycleCounterTicks;

static inline CycleCounterTicks getticks(void)
{
     CycleCounterTicks t;
     read_real_time(&t, TIMEBASE_SZ);
     return t;
}

static inline double elapsed(CycleCounterTicks t1, CycleCounterTicks t0) /* time in nanoseconds */
{
     time_base_to_time(&t1, TIMEBASE_SZ);
     time_base_to_time(&t0, TIMEBASE_SZ);
     return ((t1.tb_high - t0.tb_high) * 1e9 + (t1.tb_low - t0.tb_low));
}

#define HAVE_TICK_COUNTER
#endif

/*----------------------------------------------------------------*/
/*
 * PowerPC ``cycle'' counter using the time base register.
 */
#if ((defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))) || (defined(__MWERKS__) && defined(macintosh)))  && !defined(HAVE_TICK_COUNTER)
typedef unsigned long long CycleCounterTicks;

static __inline__ CycleCounterTicks getticks(void)
{
     unsigned int tbl, tbu0, tbu1;

     do {
          __asm__ __volatile__ ("mftbu %0" : "=r"(tbu0));
          __asm__ __volatile__ ("mftb %0" : "=r"(tbl));
          __asm__ __volatile__ ("mftbu %0" : "=r"(tbu1));
     } while (tbu0 != tbu1);

     return (((unsigned long long)tbu0) << 32) | tbl;
}

INLINE_ELAPSED(__inline__)