Need advice about coding style

Will it be the same if I will use "procedure". Or should i shift down to component instance?

Before I believe that semantics of sequential operators the same as in "process". Perhaps i misunderstand "using function to generate schematic".

I belive that fucntion do computation and generate some combinatorial schematic, why it can not manage with synchronous?

	function isRegZero(reg : unsigned) return std_logic is
		variable temp : std_logic;
	begin
		temp := '1';
		for i in reg'range loop
			temp := temp and (not reg(i));
		end loop;
		return temp;
	end isRegZero;

with this function we get simple and-gate in schematic rather than big comparator