Two Clock Inputs questions for VHDL

Well they do not run at the same time so if both are HIGH nothing happens but :

if CPIN goes HIGH while CPINH is LOW then clock Z

if CPINH goes HIGH while CPIN is LOW then clock Z

and that is the only time something should happen because Z should be LOW unless one of the two things above happens

this clock runs a process that shifts bits.

i have tried the code below and while it simulates what i want to happen i am not sure if i have a hardware issue or

or if its still in software.

process(CPIN,CPINH)
BEGIN
if ((CPINH = '0' ) OR (CPIN = '0' ))then
	if (CPIN = '1'OR CPINH = '1')then
	Z <='1';
	ELSE
	Z<= '0';
	END IF;
END IF;
end process;