8303762: Optimize vector slice operation with constant index using VPALIGNR instruction

[jatin-bhateja]

Patch optimizes Vector. slice operation with constant index using x86 ALIGNR instruction.
It also adds a new hybrid call generator to facilitate lazy intrinsification or else perform procedural inlining to circumvent call overhead and boxing penalties in case fallback implementation expect to operate over vectors. Existing vector API-based slice implementation is now the fallback code that gets inlined in case intrinsification fails.

Preliminary performance results show 1.5 to 2x gain over existing implementation.
[TBD] Limit inlining to cases where fallback code operate over vectors.

Vector API jtreg tests pass at different AVX levels.

Please share your feedback.

Best Regards,
Jatin

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Warnings

 ⚠️ Patch contains a binary file (src/java.desktop/share/classes/java/awt/doc-files/BorderLayout-1.gif)
 ⚠️ Patch contains a binary file (src/java.desktop/share/classes/java/awt/doc-files/FlowLayout-1.gif)
 ⚠️ Patch contains a binary file (src/java.desktop/share/classes/java/awt/doc-files/GridBagLayout-1.gif)
 ⚠️ Patch contains a binary file (src/java.desktop/share/classes/java/awt/doc-files/GridBagLayout-2.gif)
 ⚠️ Patch contains a binary file (src/java.desktop/share/classes/java/awt/doc-files/GridLayout-1.gif)
 ⚠️ Patch contains a binary file (src/java.desktop/share/classes/java/awt/doc-files/GridLayout-2.gif)
 ⚠️ Patch contains a binary file (test/hotspot/jtreg/runtime/ClassFile/JsrRewritingTestCase.jar)
 ⚠️ Patch contains a binary file (test/hotspot/jtreg/runtime/ClassFile/testcase.jar)

Issue

• JDK-8303762: Optimize vector slice operation with constant index using VPALIGNR instruction (Enhancement - P4)

Reviewing

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[bridgekeeper]

👋 Welcome back jbhateja! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

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[openjdk]

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[jatin-bhateja]

/label add hotspot-compiler-dev

[openjdk]

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[jatin-bhateja]

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[openjdk]

@jatin-bhateja this pull request can not be integrated into master 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-8303762
git fetch https://git.openjdk.org/jdk.git master
git merge FETCH_HEAD
# resolve conflicts and follow the instructions given by git merge
git commit -m "Merge master"
git push