[libc-commits] [libc] [llvm] [libc][math] Improve atanf performance. (PR #85463)

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lntue wrote:

> I get an error with the CORE-MATH exhaustive tests:
> 
> ```
> Running exhaustive check in --rndu mode...
> FAIL x=-0x1.fc5d82p+0 ref=-0x1.1ab2fp+0 y=-0x1.1ab2eep+0
> ```
> 
> Can you confirm?

Thanks Paul!  It is indeed the exceptional value that I missed.  I've updated the patch accordingly.

https://github.com/llvm/llvm-project/pull/85463