RFR: JDK-8277175 : Add a parallel multiply method to BigInteger [v3]

[kabutz]

On Thu, 18 Nov 2021 07:26:45 GMT, David Holmes <dholmes at openjdk.org> wrote:

> To add my 2c IMO a parallel version of this type absolutely **must** be opt-in. There are simply far too many side-effects of using the FJP and multiple threads to perform the calculation in parallel as if it is just a minor implementation detail. A clear API is 1000x better than a "kill switch".
> 
> And yes you may still need to expose some kind of tuning knob.
> 
> David

Yes, it **must** be opt-in. However I'm not sure that a tuning knob will be necessary. BigInteger has thresholds for using different multiply algorithms and these are also not configurable.

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PR: https://git.openjdk.java.net/jdk/pull/6409