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We should make a cleanly-vectorizing fast-approximation for atan2f. #8243

@mcourteaux

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@mcourteaux

This article seems amazing reference:

https://mazzo.li/posts/vectorized-atan2.html

You may assign me, I think I'll do it. I think I'm seeing bad performance due to 8 calls to glibc's atan2f, instead of something that vectorizes cleanly.

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