RFR: 8284960: Integration of JEP 426: Vector API (Fourth Incubator) [v9]

[Jatin Bhateja]

On Wed, 25 May 2022 05:50:23 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> Hi All,
>> 
>> Patch adds the planned support for new vector operations and APIs targeted for [JEP 426: Vector API (Fourth Incubator).](https://bugs.openjdk.java.net/browse/JDK-8280173)
>> 
>> Following is the brief summary of changes:-
>> 
>> 1)  Extends the scope of existing lanewise API for following new vector operations.
>>    -  VectorOperations.BIT_COUNT: counts the number of one-bits
>>    - VectorOperations.LEADING_ZEROS_COUNT: counts the number of leading zero bits
>>    - VectorOperations.TRAILING_ZEROS_COUNT: counts the number of trailing zero bits
>>    - VectorOperations.REVERSE: reversing the order of bits
>>    - VectorOperations.REVERSE_BYTES: reversing the order of bytes
>>    - compress and expand bits: Semantics are based on Hacker's Delight section 7-4 Compress, or Generalized Extract.
>> 
>> 2)  Adds following new APIs to perform cross lane vector compress and expansion operations under the influence of a mask.
>>    - Vector.compress
>>    - Vector.expand 
>>    - VectorMask.compress
>> 
>> 3) Adds predicated and non-predicated versions of following new APIs to load and store the contents of vector from foreign MemorySegments. 
>>   - Vector.fromMemorySegment
>>   - Vector.intoMemorySegment
>> 
>> 4) C2 Compiler IR enhancements and optimized X86 and AARCH64 backend support for each newly added operation.
>> 
>> 
>>  Patch has been regressed over AARCH64 and X86 targets different AVX levels. 
>> 
>>  Kindly review and share your feedback.
>> 
>>  Best Regards,
>>  Jatin
>
> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8284960: Review comments resolved.

Hi @vnkozlov , Your comments have been addressed.

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PR: https://git.openjdk.java.net/jdk/pull/8425