Fibonacci 32bit benchamrk

// This is 32-bit version of Fibonacci benchmark, it should compile
// under Visual C++ 5.0 or 6.0 without any problems. In fact there are
// two versions of this program, depending on PIT. If PIT is defined
// program checks amount of time used using BIOS clock (PIT stands
// for Programmable Interval Timer or something like that), else
// it uses clock() function. In both cases results are almost the same.

// #define PIT

#ifndef PIT
#include <time.h>
#endif

#include <stdio.h>
#include <conio.h>

#ifdef PIT
long biostime(void)
{
__asm mov ah,0
__asm int 0x1A
__asm mov ax,cx
__asm shl eax,16
__asm xor ecx,ecx
__asm mov ecx,edx
__asm add eax,ecx
}
#endif

long __fastcall fibonacci(int i)
{
if (i > 0) return (fibonacci(i-1)+fibonacci(i-2));
else return 1l;
}

void main(void)
{
long start_time,elapsed;

   printf("Fibonacci benchmark, 32-bit version, (C) Marcin Borkowski 1998\r\n");
#ifdef PIT
   start_time = biostime();
#else
   start_time = clock();
#endif
   fibonacci(40);
#ifdef PIT
   elapsed = biostime()-start_time;
#else
   elapsed = clock() - start_time;
   elapsed = 1907l*elapsed/CLOCKS_PER_SEC;
   elapsed = 627l*elapsed/65536l;
#endif
   printf("Elapsed time: %li clock ticks (%li FiboMHertz)\r\n",elapsed,128616/elapsed);
   printf("Press any key to continue...\r\n");
   while (!kbhit());
}