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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better simd_fastinvsqrt alternative or higher similarity.

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simd_fastinvsqrt reviews and mentions

Posts with mentions or reviews of simd_fastinvsqrt. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-06-08.

I implemented the infamous Fast Inverse Square Root function from Quake III Arena with SIMD (SSE)
3 projects | /r/programming | 8 Jun 2021

No clue why the original Q_rsqrt used long considering that float is a 32 bit type and long is a 64 bit type. Unless there was some hackery going on to make long 32 bit in the Quake III Arena codebase. After changing to an int it's now significantly faster.