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C6748,调用函数为什么不用CALLP指令,而是用了B跳转指令, 这样跳转到函数后,如何再回到原程序呢?

请问如上图中,调用ldexp函数为什么不用CALLP指令,而是用了B跳转指令, 这样跳转到ldexp函数后,如何再回到本程序呢?