ClockTicks.H

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#ifdef CH_LANG_CC
/*
*      _______              __
*     / ___/ /  ___  __ _  / /  ___
*    / /__/ _ \/ _ \/  V \/ _ \/ _ \
*    \___/_//_/\___/_/_/_/_.__/\___/
*    Please refer to Copyright.txt, in Chombo's root directory.
*/
#endif

#ifndef _CLOCKTICKS_H_
#define _CLOCKTICKS_H_

// (dfm 4/29/08)note that NamespaceHeader.H gets included 3x, once for
// each "if"...


#if defined(__INTEL_COMPILER) && defined(__ia64__)
#include <ia64intrin.h>
#include <ia64regs.h>


inline unsigned long long int ch_ticks()
{
  volatile unsigned long long int rtn = __getReg(_IA64_REG_AR_ITC);
  return rtn;
}
#define CH_TICKS

#elif defined(__x86_64__) || defined(__i386__) || defined(__i686__)


union clockunion{
  unsigned int i[2];
  unsigned long long int l;
};

inline unsigned long long int ch_ticks()
{
  volatile clockunion ret;
  __asm__ __volatile__ ("rdtsc" : "=a"(ret.i[0]), "=d"(ret.i[1]));
  return ret.l;

  // for some reason this form executes on 64, bit acts funny.
  //  unsigned long long int rtn;
  //  __asm__ __volatile__("rdtsc" : "=A"(rtn));
  //  return rtn;
}
#define CH_TICKS

#elif defined(_POWER) || defined(_POWERPC) || defined(__POWERPC__)


inline unsigned long long int ch_ticks()
{
  volatile unsigned long long int tbr;
  __asm__ __volatile__("mftb %[tbr]" : [tbr] "=r" (tbr):);
  return tbr;
}
#define CH_TICKS
#else
// if we fall all the way through to here, we don't really do anything,
// but we still need the NamespaceHeader to balance
// the namespacefooter. (DFM 4/28/09)

#endif


#endif

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