可以看到test1()中每次加法都需要读取和存储全局变量errs，而在test2()中，localerrs分配在寄存器上，只需要一条指令。

Note that test1 must load and store the global errs value each time it is incremented, whereas test2 stores localerrs in a register and needs only a single instruction.

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寄存器可以绕过一些简单的加法或用于蓄电池功能。

The register can be bypassed for simple adders or used for accumulator functions.

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每来一个时钟脉冲，N位加法器将频率控制数据m与相位寄存器输出的累加相位数据相加，并将结果送相位寄存器输入端。

Frequency controlled data (m) plus an accumulative phase data output by a phase register in an N-bit adder when a clock pulse comes, the result is sent to the input port of the phase register.

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