除了全局寄存器分配以外，还实现了一个在基本块上的局部寄存器分配。

Besides global register allocation, local register allocation on basic block is also implemented. It cooperate with global register allocation in our methodology.

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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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全局变量不会被分配在寄存器上，修改全局变量需要通过指针或者调用函数的方式间接进行。

Global variables are never allocated to registers. Global variables can be changed by assigning them indirectly using a pointer, or by a function call.

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