I especially said hardware for decimal floats and didn't include fixed point. You don't need special hardware for fixed point. Addition and subtraction are the

I especially said hardware for decimal floats and didn't include fixed point. You don't need special hardware for fixed point. Addition and subtraction are the same as if you would do it with integers, for multiplication and division you also need to shift additionally. With floating point you also have endless possibilities how to define them. Next to the standard IEEE ones you for instance have 80 bit ones you had to use on intel CPUs. With fixed point arithmetic you don't really have standards but common ones like Q16.16