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TMS320F28377D: 关于 PI_MACRO(v)中占用计算周期的疑问

Part Number: TMS320F28377D


关于PI所占用的计算周期的问题,官方例程为

占用时间计算为

如图中所示,单个PI计算总共需要50个计算周期,在FPU中,关于饱和函数的计算就大约需要40多个计算周期了,这个是如何做到的,是需要用IQmath才能做到单个PI总共需要50个计算周期的高效程度吗?