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how to do 64-bit word norm operation?

Anyone knows how to do 64-bit word norm operation?

From TMS320C6000 programmer's guide, I can find

uint _norm(int src2) for 32-bit word

uint _lnorm(long src2) for 40-bit word

intrinsics. But there is no norm intrinsic is defined for 64-bit word.

Thanks.