RFR: 8338694: x86_64 intrinsic for tanh using libm [v3]

[Sandhya Viswanathan]

On Wed, 4 Sep 2024 01:57:42 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> @theRealAph, this implementation is based on Intel libm math library and meets the accuracy requirements. The algorithm is provided in the comments.
>
> @vamsi-parasa  don't hesitate in adding as much and explicit information about the original source from where the algorithm has been picked up, even though the PR explicitly mentions libm. Adding the link to source references is a good practice.

@jatin-bhateja This is based on Intel internal LIBM sources and so there is no public link available.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20657#discussion_r1747726562