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// $Id$
//
// Build this file with g++. It can be linked in to a ACE application
// that was compiled with GreenHills. It wouldn't be necessary if I
// knew a way to correctly move values from registers to a 64-bit variable
// in GHS asm code. That's easy with g++ asm.
#include "ace/OS.h"
extern "C"
ACE_hrtime_t
ACE_gethrtime ()
{
#if defined (ACE_HAS_PENTIUM)
// ACE_TRACE ("ACE_gethrtime");
#if defined (ACE_LACKS_LONGLONG_T)
double now;
#else /* ! ACE_LACKS_LONGLONG_T */
ACE_hrtime_t now;
#endif /* ! ACE_LACKS_LONGLONG_T */
// See comments about the RDTSC Pentium instruction for the ACE_WIN32
// version of ACE_OS::gethrtime () in ace/OS.i.
//
// Read the high-res tick counter directly into memory variable "now".
// The A constraint signifies a 64-bit int.
#if defined (__GNUG__)
asm volatile ("rdtsc" : "=A" (now) : : "memory");
// #elif defined (ghs)
// The following doesn't work. For now, this file must be compile with g++.
// asm ("rdtsc");
// asm ("movl %edx,-16(%ebp)");
// asm ("movl %eax,-12(%ebp)");
#else
# error unsupported compiler
#endif
#if defined (ACE_LACKS_LONGLONG_T)
// ACE_U_LongLong doesn't have the same layout as now, so construct
// it "properly".
unsigned int least, most;
ACE_OS::memcpy (&least, &now, sizeof (unsigned int));
ACE_OS::memcpy (&most, &now + sizeof (unsigned int), sizeof (unsigned int));
ACE_hrtime_t ret (least, most);
return ret;
#else /* ! ACE_LACKS_LONGLONG_T */
return now;
#endif /* ! ACE_LACKS_LONGLONG_T */
#else /* ! ACE_HAS_PENTIUM */
# error This file can _only_ be compiled with ACE_HAS_PENTIUM.
#endif /* ! ACE_HAS_PENTIUM */
}
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