Global variables are never allocated to registers. Global variables can be changed by assigning them indirectly using a pointer, or by a function call.
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。
This is true even if you never actually call the function.
即使你实际上从不调用该函数，情况也是这样。
This is true even if you never actually call the function.
即使你实际上从不调用该函数，情况也是这样。
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