RFR: 8353786: Migrate Vector API math library support to FFM API [v5]

[Vladimir Ivanov]

On Tue, 15 Apr 2025 09:29:32 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Vladimir Ivanov 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 19 additional commits since the last revision:
>> 
>>  - Merge branch 'master' into vector.math.01.java
>>  - RVV and SVE adjustments
>>  - Merge branch 'master' into vector.math.01.java
>>  - Fix windows-aarch64 build failure
>>  - features_string -> cpu_info_string
>>  - Reviews and Float64Vector-related fix
>>  - Misc fixes and cleanups
>>  - CPU features support
>>  - Cleanup
>>  - TODO list
>>  - ... and 9 more: https://git.openjdk.org/jdk/compare/3a706abc...0ffed12f
>
> src/jdk.incubator.vector/share/classes/jdk/incubator/vector/VectorMathLibrary.java line 198:
> 
>> 196:             if (vspecies.vectorBitSize() < 128) {
>> 197:                 return false; // 64-bit vectors are not supported
>> 198:             }
> 
> Thanks for your refactor. It's really a good job!  
> 
> It seems float type support 64-bit vector operations before (see https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp#L9835). Will this change the behavior of 64-bit float vector? Thanks!

Thanks for taking a look. 

In the latest version, Float64Vector cases should be properly handled.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24462#discussion_r2045156970