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

[Xiaohong Gong]

On Fri, 11 Apr 2025 21:23:52 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Migrate Vector API math library (SVML and SLEEF) linkage from native code (in JVM) to Java FFM API.
>> 
>> Since FFM API doesn't support vector calling conventions yet, migration affects only symbol lookup for now. But it still enables significant simplifications on JVM side.
>> 
>> The patch consists of the following parts:
>>   * on-demand symbol lookup in Java code replaces eager lookup from native code during JVM startup;
>>   * 2 new VM intrinsics for vector calls (support unary and binary shapes) (code separated from unary/binary vector operations);
>>   * new internal interface to query supported CPU ISA extensions (`jdk.incubator.vector.CPUFeatures`) used for CPU dispatching.
>> 
>> `java.lang.foreign` API is used to perform symbol lookup in vector math library, then the address is cached and fed into corresponding JVM intrinsic, so C2 can turn it into a direct vector call in generated code.
>> 
>> Once `java.lang.foreign` supports vectors & vector calling conventions, VM intrinsics can go away. 
>> 
>> Performance is on par with original implementation (tested with microbenchmarks on linux-x64 and macosx-aarch64).
>> 
>> Testing: hs-tier1 - hs-tier6, microbenchmarks (on linux-x64 and macosx-aarch64)
>> 
>> Thanks!
>
> 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/6e3fd4ab...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!

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PR Review Comment: https://git.openjdk.org/jdk/pull/24462#discussion_r2044095931