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Hi Manoel,
IQrmpy function is a function call which consists of an optimized asm routine in such a way that the clock cycles required to compute the result is way lesser than the reqular computation.
For more details can go through this doc: http://www3.dogus.edu.tr/ucini/DSPArithmeticTutorial.pdf
This doc will provide you with step by step assembly implementation of every function.
Regards,
Gautam
It's a function in the IQmath library. Without rounding (IQmpy) is an intrinsic as shown in the document www.ti.com/lit/spru514
-Lori