fixsqrt: * Fixed point square root routine. * * This routine is based upon the following idea: * sqrt (x) = sqrt (x/d) * sqrt(d) * d = 2^(2n) * sqrt (x) = sqrt (x / 2^(2n)) * 2^n * `x/2^(2n)' has to fall into the range 0..255 so that we can use the * square root lookup table. So `2n' is the number of bits `x' has to be * shifted to the left to become smaller than 256. The best w
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