-fomit帧指针是否总是省略帧指针？是否存在需要同时设置pc和fp的情况？动态堆栈增长是否会强制设置fp？专门询问MIPS32。谢谢
帧指针并不是正确执行所必需的，除非有时用于异常展开。动态堆栈增长通常需要某种帧指针，但它并不绑定到特定的寄存器，而是通过正常的数据流分析进行分配。
基本上，-fomit帧指针将FP从固定寄存器分配降级为伪寄存器，并使初始化受到死存储消除的影响。因此，第一个问题的答案是否定的，它并不总是省略它。
不，通常不需要帧指针。编译器可以访问相对于堆栈指针的局部变量，并且不需要特殊的帧指针。
尽管如此，标准的帧指针设置序列在调试崩溃的程序时（即使不是用-g编译的）也会有所帮助，因为调试器可以使用帧指针信息来重建调用堆栈。在没有帧指针的情况下，它没有信息来确定一个堆栈帧从哪里开始，下一个帧从哪里结束。
因此，当使用-fomit帧指针时，您是在用性能换取更困难的调试，以防崩溃。如果代码的性能关键部分是小循环，并且不调用任何函数，那么省略帧指针也不会带来什么好处。
不是mips的人，而是应该应用于任何系统的东西：如果堆栈需要在任何点对齐，则需要使用一个帧来存储原始指针（因为堆栈地址和对齐可能不知道）
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