全局指令调度可划分为有环和无环两种。

Global instruction scheduling techniques can be roughly divided into two categories: cyclic scheduling and acyclic scheduling.

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在全局设置中添加以下指令。

In the global Settings, add the following directives.

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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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