Divided integer number

I can't read VHDL, sorry. But if you want to trade logic elements for hard memory blocks you could use a look-up table. It would need to be 2^12 deep (4096) and wide enough to drive your 4-digit display. I would think this would take 4 bits per digit, but you've got your output digits defined as 12 bits each. Assuming you only need 16 bits out (4 bits per digit) the look-up table would consume 8 M9Ks I believe. They're there so you may as well use them.