[cmovq]

> 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

[def-pri-pub]

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

[seanhunter]

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

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