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28335 float做1000次乘法达到604us,FPU已经加载怎么会这么长的

Other Parts Discussed in Thread: CONTROLSUITE

使用28335,主频150MHZ,程序从flash加载到RAM中运行,做1000次float型乘法计算,启用FPU时通过GPIO口示波器测得运行时间为604uS,不使用FPU时间长达2.8mS,请问你们测试下来需要多长时间的,感觉不太对劲。