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F28335浮点转换定点函数转换直接数和转换变量时耗时相差非常大，如_IQ(0.1666667)只要2个CPU时钟，而 x=0.1666667，_IQ(x)则236个。我需要转换一个变量，怎么样使类似_IQ(x)计算耗时减小？
