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Asked: 2026-06-08T12:50:20+00:00

I found on net Fast Inverse Square Root on http://en.wikipedia.org/wiki/Fast_inverse_square_root . Does it work

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I found on net Fast Inverse Square Root on http://en.wikipedia.org/wiki/Fast_inverse_square_root . Does it work properly on x64 ?
Did anyone use and serious test ?

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  1. Editorial Team

    Originally Fast Inverse Square Root was written for a 32-bit float, so as long as you operate on IEEE-754 floating point representation, there is no way x64 architecture will affect the result.

    Note that for “double” precision floating point (64-bit) you should use another constant:

    …the “magic number” for 64 bit IEEE754 size type double … was shown to be exactly 0x5fe6eb50c7b537a9

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