RFR: 8303762: Optimize vector slice operation with constant index using VPALIGNR instruction [v8]

[erifan]

On Thu, 25 Sep 2025 08:52:09 GMT, erifan <duke at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update callGenerator.hpp copyright year
>
> test/hotspot/jtreg/compiler/vectorapi/TestSliceOptValueTransforms.java line 45:
> 
>> 43:     public static final VectorSpecies<Short> SSP = ShortVector.SPECIES_PREFERRED;
>> 44:     public static final VectorSpecies<Integer> ISP = IntVector.SPECIES_PREFERRED;
>> 45:     public static final VectorSpecies<Long> LSP = LongVector.SPECIES_PREFERRED;
> 
> The implementation supports floating point types, but why doesn't the test include fp types?

It might be better to consider **partial cases**. I looked at the aarch64 situation and found that different implementations are needed for partial and non-partial cases. The test indices in `test/jdk/jdk/incubator/vector/` are randomly generated, so it might be better to test different vector species here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24104#discussion_r2409431981