RFR: 8287925: AArch64: intrinsics for compareUnsigned method in Integer and Long

[Hao Sun]

On Mon, 28 Nov 2022 17:42:24 GMT, Andrew Haley <aph at openjdk.org> wrote:

> I've been trying for an hour or so to write a benchmark that is actually improved by this patch. I have been unable to do so. Part of the problem is that using `cmp; cset; cneg` doesn't take advantage of branch prediction. And more often than not, the result of a comparison is predictable. Also, the code isn't necessarily shorter either. I do not believe this patch should be committed unless someone manages to write a benchmark that demonstrates some advantage.

Thanks for your insightful comment. I'm doing some investigation.

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PR: https://git.openjdk.org/jdk/pull/11383