RFR: 8371571: Consolidate and enhance bulk memory segment ops benchmarks [v5]

[Emanuel Peter]

On Tue, 25 Nov 2025 12:22:29 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR proposes to consolidate and standardize the benchmarks related to the bulk operations for memory segments. 
>> 
>> All the benchmarks will now run with (heap|native)x(aligned|unaligned)x(intint|intlong|longlong) combinations.
>> 
>> It should be noted that with this change, the running time for the benchmarks would increase significantly.
>
> Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains nine additional commits since the last revision:
> 
>  - Update after comments
>  - Merge branch 'master' into improved-bulk-benchmarks
>  - Add loop variant for mismatch
>  - Use other allocateFrom overload
>  - Remove lingering comment
>  - Refactor and use long arrays
>  - Remove BulkOps
>  - Fix copyright years
>  - Improve BulkOp benchmarks

FYI: I'm working on a related benchmark with https://github.com/openjdk/jdk/pull/27315. But I take a different approach to alignment: I "randomize" the alignment by starting at various different offsets for loads and stores. I have lots of plots in case you are graphically inclined ;)

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PR Comment: https://git.openjdk.org/jdk/pull/28260#issuecomment-3579400320