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Distance and inverse sqrt

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I am looking for the fastest method to calculate my distance. I have a program that tests different sqrt functions out there. I am finding many fast inverse sqrt functions, is there any way to utilize these for distance other than dividing 1.0f by the result?

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Quote:
Original post by skow
I am looking for the fastest method to calculate my distance. I have a program that tests different sqrt functions out there. I am finding many fast inverse sqrt functions, is there any way to utilize these for distance other than dividing 1.0f by the result?


sqrt(x) = x*sqrtInverse(x)

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y = x * rsqrt (x)

rqrtf(x) is the very fast newton-rapson aproximation that is floating around everywhere.

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