Faster asin() was hiding in plain sight

Re:Faster asin() was hiding in plain sight by cmovq on Wednesday March 11, 2026 @01:44PM (#47338741)

> After all of the above work and that talk in mind, I decided to ask an LLM.

Impressive that an LLM managed to produce the answer from a 7 year old stack overflow answer all on its own! [1] This would have been the first search result for “fast asin” before this article was published.

[1]: https://stackoverflow.com/a/26030435

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Re:Faster asin() was hiding in plain sight by def-pri-pub on Wednesday March 11, 2026 @02:26PM (#47339292)

I did see that, but isn't the vast majority of that page talking about acos() instead?

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Re:Faster asin() was hiding in plain sight by seanhunter on Wednesday March 11, 2026 @05:15PM (#47342021)

That’s equivalent right? acos x = pi/2 - asin x

So if you’ve got one that’s fast you have them both.

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