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

[Guoxiong Li]

On Wed, 27 Apr 2022 11:03:48 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

Remind: please use the command `/jep JEP-426` [1] to mark this PR.

[1] https://wiki.openjdk.java.net/display/SKARA/Pull+Request+Commands#PullRequestCommands-/jep

-------------

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