RFR: 8371187: [BigEndian Platforms] Vector lane reversal error [v3]

[Martin Doerr]

On Tue, 20 Jan 2026 18:40:08 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Varada M has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains two new commits since the last revision:
>> 
>>  - 8371187: [BigEndian Platforms] Vector lane reversal error
>>  - fix for vector alignment issue on big-endian
>
> src/jdk.incubator.vector/share/classes/jdk/incubator/vector/AbstractVector.java line 194:
> 
>> 192:             int[] id = new int[lanes];
>> 193:             for (int i = 0; i < lanes; ++i) id[i] = i;
>> 194:             return VectorShuffle.fromArray(targetSpecies, id, 0);
> 
> Some comments would be helpful describing what you do in which case.

Wouldn't it be more efficient to handle this case by

if (subLanesPerSrc <= 1) {
    return this;
}

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PR Review Comment: https://git.openjdk.org/jdk/pull/28425#discussion_r2716282144