如果状态信息由被调用者保存，那保存和恢复代码每函数一套；

If the status is saved by the called procedure, the save/restore code is generated once per procedure;

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保存调用者的连接寄存器(LR)。

Save the caller's link register (LR).

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调用者必须在调用这个过程后执行COMMIT来保存解释信息。

The caller must ensure to perform COMMIT after calling this procedure to save the explain information.

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