quickDiv1000.c

// Yields the approximate result of a division by 1000.
// NOTE:  Can only be used for numbers less than 140,737,488,290
unsigned long quickDiv1000(unsigned long num)
{
  unsigned long result;

	result = num * 65 + (num >> 2) + (num >> 5) + (num >> 8)+ (num >> 11) + 32768;
	return (result >> 16);
}

working translation:

fuction: returns approximate result of division by 1000 (fucked in some edge cases)
parameters: incoming (integer)

intermediate = incoming * (2^6 + 1) + (incoming/2^1) + (incoming/2^5) + (incoming/2^8)+ (incoming/2^11) + 2^15
return (intermediate/2^16)