Going down the size optimization rabbit hole a little bit (not criticism, I just enjoy this sort of puzzle). Two bytes shorter: call print_str ret =>

Going down the size optimization rabbit hole a little bit (not criticism, I just enjoy this sort of puzzle). Two bytes shorter: call print_str ret => jmp print_str Three bytes shorter; this one may be a little too clever, since it depends on the low bit of CR0 being 0 initially: mov EAX, CR0 or EAX, 1 => mov EAX, CR0 inc AX