Epilog code trims the stack to its fixed allocation size (if necessary), deallocates the fixed stack allocation, restores nonvolatile registers by popping their saved values from the stack, and returns.

• Epilog代码执行以下操作:必要时将堆栈修整为其固定分配大小;释放固定堆栈分配;从堆栈中弹出非易失寄存器的保存值以还原这些寄存器;返回。