RFR: 8338694: x86_64 intrinsic for tanh using libm

[Andrew Haley]

On Tue, 27 Aug 2024 22:23:44 GMT, Srinivas Vamsi Parasa <duke at openjdk.org> wrote:

>> I agree, this is all rather obscure. Ideally the same names that are used in wherever this comes from.
>> 
>> Where does the algorithm come from? What are its accuracy guarantees?
>> 
>> In addition, given the rarity of hyperbolic tangents in Java applications, do we need this?
>
> @theRealAph, this implementation is based on Intel libm math library and meets the accuracy requirements. The algorithm is provided in the comments.

Do you have a copy of this information? Should it be in the commit?

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PR Review Comment: https://git.openjdk.org/jdk/pull/20657#discussion_r1734776732