//#include "math.h"
// Arithmatic functions using add & subtract

unsigned long mult_u(register unsigned long var1, register unsigned long var2)
{

	  register unsigned long var_out = 0;
	
	  while (var2 > 0)
	  {

	  	if (var2 & 0x01) 
		{
			var_out += var1;
		}
		var2 >>= 1;
		var1 <<= 1;
  }
	return var_out;
	
}// mult_u

unsigned long ldiv_mod_u(register unsigned long a, register unsigned long b, unsigned long * mod)
{
	register unsigned long div = b;
	register unsigned long res = 0;
	register unsigned long bit = 0x1;

	if (!div)
	{
		*mod = 0;
		return 0xffffffff ; // Div by 0
	}

	if (a < b)
	{
		*mod = a;
		return 0; // It won't even go once
	}

	while(!(div & 0x80000000))
	{
		div <<= 1;
		bit <<= 1;
	}

	while (bit)
	{
		if (div <= a)
    		{
		      res |= bit;
		      a -= div;
		 }
	    div >>= 1;
	    bit >>= 1;
	}
 	 *mod = a;
  	return res;
}// ldiv_mod_u


unsigned ldiv_u(register unsigned a, register unsigned  b)
{  
	register unsigned div = b << 16;
	register unsigned res = 0;
	register unsigned bit = 0x10000;
	
	while (bit)
  	{
  		div >>= 1;
		bit >>= 1;
		if (div < a)
		{
			res |= bit;
			a -= div;
		}
	} 
	
	return res;
}