RFR: JDK-8277175 : Add a parallel multiply method to BigInteger [v7]

[kabutz]

On Thu, 16 Dec 2021 21:22:02 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> > "embarrassingly parallel when employing recursive" -> "embarrassingly non-parallel when employing recursive" (?)
> 
> I corrected to "embarrassingly parallelizable" (i believe that is a common phrase we as software engineers use in these cases).

Makes more sense that way. Should we add something about it not being computationally worthwhile doing for the Karatsuba calculation, which is even easier to parallelize, but which has a lower threshold and thus does not give performance advantages?

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