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DSPLib problem

Hi,

I want to find autocorrelation of a large value sized array of 2000. The code is implemented using intrisics,but the code is extrememly slow.So I was trying DSPLib of C5515 in order to reduce MIPS. I used power function for this which produces a Q31 format number. And the input should be DATA datatype. But the overflag is set because of 32 bit overflow. In the documentation,it is stated that no scaling is implmented for handling ovrflow. 

How can i solve this problem? 

PLz help.Thanks.

Regards,

james