RFR: 8343629: More MergeStore benchmark

[Shaojin Wen]

On Thu, 14 Nov 2024 07:48:38 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> @eme64 Are there plans to support MergeLoad, and big-endian MergeStore on little-endian machines?
>
> @wenshao Ah. I only just realized it: you have a lot of `get` benchmarks... they don't really belong to `MergeStores`... if anything you could put them in a separate `MergeLoads` benchmark!
> 
> Also: now we have lots of data here. But data alone is kind of pointless. We need analysis to see **what patterns** and **why** they get speedups.

@eme64 I have updated the benchmark numbers above, removing the getXXX part. I have also added some analysis. I found that the test using VarHandle is the fastest, whether it is BigEndian or LittleEndian. All the BigEndian tests are not MergeStored, including the Reverse combination scenario.

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PR Comment: https://git.openjdk.org/jdk/pull/21659#issuecomment-2482831411