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源代码如下：
编译器版本信息：
这个是写法问题还是编译器问题呢?
@一条咸鱼 atan不被认为是intrinsic function？试试加ffast-math，如果不行那就只好算出来贴进去咯。。。
-ffast-math 这个参数不行，只能改为具体数据相乘了
