One could get rid of the push / pop though, assuming that the high bits of EAX don't need to be saved: movzx eax,al ;could also do "and eax,0ffh" mov a

One could get rid of the push / pop though, assuming that the high bits of EAX don't need to be saved: movzx eax,al ;could also do "and eax,0ffh" mov al,[rbx+rax]