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Re:Understanding Quake's Fast Inverse Square Root by gcv on Sunday January 04, 2009 @11:24AM (#419291)
According to this article, neither of them: http://www.beyond3d.com/content/articles/8/

That article also links to a paper (http://www.lomont.org/Math/Papers/2003/InvSqrt.pdf) analyzing the initial approximation constant.

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