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DSPLIB sqrt_16() function output

Liang Ge
Prodigy 180 points

I'm testing sqrt_16() function on my C5535 dsp. I got a few test results, but I don't understand the numbers at all.

Input x     |     sqrt_16(x)

1100        |     6005

31133     |     31939

even square root of 1 is not 1.

Can someone point out what I'm missing here? Thanks!

Liang