8339494: Porting HalfFloatVector classes.

[jatin-bhateja]

• Port existing HalfFloatVector and its concrete vector classes from vectorIntrinsics+fp16 to lworld+fp16.
• These new vector classes uses Float16 array as their backing storage.
• Idea is to enable intrinsificaiton of new HalfFloatVector operations and leverage existing Float16 auto-vectorization and backend support.

All existing VectorAPI tests are passing with the patch.

Best Regards,
Jatin

Follow up work:-
a) Jtreg suite extensions to cover HalfFloatVector operations.
b) Handle Float16 lane type in vector API inline expansion layer.

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Progress

• Change must not contain extraneous whitespace

Warning

 ⚠️ Found trailing period in issue title for 8339494: Porting HalfFloatVector classes.

Issue

• JDK-8339494: Porting HalfFloatVector classes. (Enhancement - P4)

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[openjdk]

@jatin-bhateja this pull request can not be integrated into lworld+fp16 due to one or more merge conflicts. To resolve these merge conflicts and update this pull request you can run the following commands in the local repository for your personal fork:

git checkout JDK-8339494
git fetch https://git.openjdk.org/valhalla.git lworld+fp16
git merge FETCH_HEAD
# resolve conflicts and follow the instructions given by git merge
git commit -m "Merge lworld+fp16"
git push

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