From: kallekula60 AT hotmail DOT com (Daniel Friberg)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Cpu speed detection using DJGPP?
Date: 25 Jul 2001 00:47:26 -0700
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To: djgpp AT delorie DOT com
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Thanks for all the replies! This is what I came up with and it seems
too work fine on my K6-2 computers.

#include <stdio.h>
#include <time.h>

int main()
{
  unsigned long val1, val2,speed;
  unsigned long tm1,tm2,i ;
  double time;

  tm1 = uclock();
  asm
  (
		"rdtsc\n
		 movl %%eax, %0"
		: "=g" (val1)
		: /* no inputs */
		: "ax", "dx"
  );
  for(i=0;i<100000;i++);
  tm2 = uclock();
  asm
  (
		"rdtsc\n
		 movl %%eax, %0"
		: "=g" (val2)
		: /* no inputs */
		: "ax", "dx"
  );
  
  time = (double) (tm2 - tm1) / UCLOCKS_PER_SEC;
  speed = (val2-val1)/time/1000000;
  
  printf("Time elapsed: %f seconds.\n",time);
  printf("Cycles executed: %d.\n",val2-val1);
  printf("Calculated speed: %dMHz.\n",speed);
  
  return 0;
}


//Daniel