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fast_rsqrt for f32 and f64 types#13718

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Commits on Apr 24, 2014

• Added a fast_rsqrt function to compute, well, fast inverse square roots. It uses the Newton's method approach originally seen in Quake Arena

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• Made lines in f32.rs and f64.rs shorter than 100 chars

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• eliminated the std:: prepended to transmute calls that originated from testing the function

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• Added fast_rsqrt to Float's traits

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• removed dead assignment

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