rdtsc.h

#ifndef __RDTSC_H_DEFINE__
#define __RDTSC_H_DEFINE__

#include <stdint.h>

#if defined(__i386__)

static __inline__  uint64_t rdtsc(void)
{
  uint64_t x;
  __asm__ volatile ("rdtsc" : "=A" (x));
  return x;
}
#elif defined(__x86_64__)

static __inline__ uint64_t rdtsc(void)
{
  unsigned hi, lo;
  __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
  return ( (uint64_t)lo)|( ((uint64_t)hi)<<32 );
}

#elif defined(__powerpc__)

#if defined(__powerpc64__)

static __inline__  uint64_t rdtsc(void)
{
  uint64_t x;
  asm volatile ("mfspr %0,%1" :
                "=&r" (x)
                : "i" (0x10C) ); /* read 64-bit timebase */
  return x;
}

#else

static __inline__ uint64_t rdtsc(void)
{
  uint64_t result=0;
  unsigned long int upper, lower,tmp;
  __asm__ volatile(
                "0:                  \n"
                "\tmftbu   %0           \n"
                "\tmftb    %1           \n"
                "\tmftbu   %2           \n"
                "\tcmpw    %2,%0        \n"
                "\tbne     0b         \n"
                : "=r"(upper),"=r"(lower),"=r"(tmp)
		   );
  result = upper;
  result = result<<32;
  result = result|lower;

  return(result);
}
#endif

#endif // __powerpc__

#endif