* Function: SqrtFix * * Description: use binary search to calculate sqrt(q) * * Inputs: q = Q30 * number of fraction bits in input * * Outputs: number of fraction bits in output * * Return: lo = Q(fBitsOut) * * Notes: absolute precision varies depending on fBitsIn * normalizes input to range [0x200000000, 0x7fffffff] and takes *
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