This is also a feature of adder circuits and alus that permits these devices to “ look ahead ” to anticipate that all “ carries ” generated are available for addition 先行也是加法器電路和運(yùn)算器的一種特性,它允許加法運(yùn)算時(shí)對(duì)所有產(chǎn)生的進(jìn)位預(yù)先處理,以利于提高加法運(yùn)算的速度。