RFR: 8335628: C2 SuperWord: cleanup: remove SuperWord::longer_type_for_conversion [v3]

[Emanuel Peter]

On Mon, 29 Jul 2024 15:56:00 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Emanuel Peter 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 three additional commits since the last revision:
>> 
>>  - Merge branch 'master' into JDK-8335628-rm-sw-longer_type_for_conversion
>>  - Merge branch 'master' into JDK-8335628-rm-sw-longer_type_for_conversion
>>  - 8335628
>
> There was micro `TypeVectorOperations.java ` in [8283091](https://github.com/openjdk/jdk/commit/a1795901ee292fa6272768cef2fedcaaf8044074) changes. Can you check that there is no regression on our supported platforms?

@vnkozlov I ran that benchmark both on x64 (AVX512) and aarch64 (neon). There is no significant difference. (i.e. the difference between the SuperWord and non-SuperWord runs of that benchmark is in factors 2x-10x, the difference between master and patch of the SuperWord run is in the normal noise range).

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PR Comment: https://git.openjdk.org/jdk/pull/20009#issuecomment-2283804394