RFR: 8343629: More MergeStore benchmark

[Emanuel Peter]

On Thu, 14 Nov 2024 05:55:24 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>>> @eme64 Why is there no noticeable difference in the performance of +/-MergeStores
>> 
>> What did you do to find out yourself? Did you use the trace flags to see if there is a difference in what is optimized / the output assembly code?
>
> @eme64 Are there plans to support MergeLoad, and big-endian MergeStore on little-endian machines?

@wenshao I'll look at your results later.

> @eme64 Are there plans to support MergeLoad, and big-endian MergeStore on little-endian machines?

These are all good ideas, and I already discussed it offline with @cl4es . I have lots of tasks I'm working on, and this is on the lowest tier of priorities for me personally. But if someone else wants to jump on that, then I can coach and review.

We could also be interested in "MergeCopy", i.e. load->store patterns. Maybe this just ends up being SuperWord again, but this time for straight line code.

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PR Comment: https://git.openjdk.org/jdk/pull/21659#issuecomment-2475556984