之后，是两个加法指令，第一个是普通相加，第二个是带进位相加。

Then comes two add instructions. The first is a normal add and the second one is add with carry.

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首先介绍了常用并行加法器的设计方法，并在此基础上采用带进位强度的跳跃进位算法，通过逻辑综合和布局布线设计出了一个加法器。

On the basis we design an adder by the adoption of carry skip algorithm with carry strength signals and implement, through logic synthesis and layout.

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