RFR: 8371187: [BigEndian Platforms] Vector lane reversal error [v5]

[Harshit470250]

On Fri, 23 Jan 2026 10:51:18 GMT, Varada M <varadam at openjdk.org> wrote:

>> This change fixes incorrect lane ordering in reinterpretation operations on big-endian platforms. When converting from wider to narrower lane types like Long to Int, Long to Short, big-endian systems produced reversed sub-lanes.
>> The patch adds a maybeSwapOnConverted() and a generic normalizeSubLanesForSpecies() shuffle builder to correct the sub-lane order based on element sizes on big-endian
>> 
>> JBS: [JDK-8371187](https://bugs.openjdk.org/browse/JDK-8371187)
>
> Varada M has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - 8371187: [BigEndian Platforms] Vector lane reversal error
>  - 8371187: [BigEndian Platforms] Vector lane reversal error

I have run the tests on s390. They passed.

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PR Comment: https://git.openjdk.org/jdk/pull/28425#issuecomment-3804189419