If, like me, you were left hoping for some explanation of the actual magic behind this code, try this: http://www.lomont.org/Math/Papers/2003/InvSqrt.pdf http:/

If, like me, you were left hoping for some explanation of the actual magic behind this code, try this: http://www.lomont.org/Math/Papers/2003/InvSqrt.pdf http://www.lomont.org/Math/Papers/2003/InvSqrt.pdf