RFR: 8276673: Optimize abs operations in C2 compiler [v4]

[Jie Fu]

On Mon, 13 Dec 2021 08:08:28 GMT, Fei Gao <fgao at openjdk.org> wrote:

> The PR optimizes abs operations in the C2 middle end. Can I have your review please?

So what's the performance data before and after this patch?
Does it also benefit on x86?

It would be better to provide a jmh micro benchmark.
Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/6755