8252311: AArch64: save two words in itable lookup stub

[bulasevich]

The change was reviewed on hotspot-compiler-dev, but I missed the time to complete
the commit to the mercural repo. Can I get it approved once again?

Issue: JDK-8252311

Description:
The interface method lookup stub becomes hot when interface calls
are performed frequently. The stub assembly code can be made
shorter (132->124 bytes) by using a pre-increment instruction variant.

Review by Andrew Dinn && Andrew Haley:
http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-September/039818.html
http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-September/039833.html

For the reference, benchmark scores with higher iteration number:

Neoverse                              Cnt   Score     Error  ->    Score   Error   Units
InvokeInterface.bench                  25  6163.804 ±  5.116 -> 6303.035 ± 5.450  ops/ms
InvokeInterface.bench:L1-icache-loads   5   305.408 ±  1.895 ->  272.891 ± 0.750    #/op
InvokeInterface.bench:iTLB-loads        5   221.755 ±  0.990 ->  207.635 ± 0.566    #/op
InvokeInterface.bench:instructions      5  1035.468 ±  2.701 ->  953.466 ± 1.667    #/op 

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8252311: AArch64: save two words in itable lookup stub

Reviewers

• Andrew Dinn (@adinn - Reviewer)
• Andrew Haley (@theRealAph - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/jdk pull/189/head:pull/189
$ git checkout pull/189

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[openjdk]

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[mlbridge]

Webrevs

• 00: Full (1d842a4)

[openjdk]

@bulasevich This change now passes all automated pre-integration checks. In addition to the automated checks, the change must also fulfill all project specific requirements

After integration, the commit message will be:

8252311: AArch64: save two words in itable lookup stub

Reviewed-by: adinn, aph

• If you would like to add a summary, use the /summary command.
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Since the source branch of this PR was last updated there have been 60 commits pushed to the master branch:

• 22f7af7: 8253317: The "com/apple/eawt" is missed in the "othervm.dirs" config option
• f55dd9d: 8251548: Remove unnecessary explicit initialization of volatile variables in security-libs code
• d35b117: 8253361: Shenandoah: runtime barrier does not honor ShenandoahSelfFixing flag
• f37c34d: 8253270: Limit fastdebug inlining in G1 evacuation
• 8904420: 8253153: Mentioning of "hour-of-minute" in java.time.temporal.TemporalField JavaDoc
• 52c28b8: 8253239: Disable VS warning C4307
• 05572e8: 8253350: Remove unimplemented SharedRuntime::clean_*_entry
• 43019a0: 8253345: Remove unimplemented Arguments::lookup_logging_aliases
• 6e9efff: 8253344: Remove unimplemented Arguments::check_gc_consistency
• 83b2411: 8253342: Fix typos in String.transform
• ... and 50 more: https://git.openjdk.java.net/jdk/compare/74851c507bed9eb2e1e0b0eac3b53a74decb2588...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid automatic rebasing, please merge master into your branch, and then specify the current head hash when integrating, like this: /integrate 22f7af7fcff0d29d741483928d8540ebb6d10379.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[bulasevich]

/integrate

[openjdk]

@bulasevich Since your change was applied there have been 60 commits pushed to the master branch:

• 22f7af7: 8253317: The "com/apple/eawt" is missed in the "othervm.dirs" config option
• f55dd9d: 8251548: Remove unnecessary explicit initialization of volatile variables in security-libs code
• d35b117: 8253361: Shenandoah: runtime barrier does not honor ShenandoahSelfFixing flag
• f37c34d: 8253270: Limit fastdebug inlining in G1 evacuation
• 8904420: 8253153: Mentioning of "hour-of-minute" in java.time.temporal.TemporalField JavaDoc
• 52c28b8: 8253239: Disable VS warning C4307
• 05572e8: 8253350: Remove unimplemented SharedRuntime::clean_*_entry
• 43019a0: 8253345: Remove unimplemented Arguments::lookup_logging_aliases
• 6e9efff: 8253344: Remove unimplemented Arguments::check_gc_consistency
• 83b2411: 8253342: Fix typos in String.transform
• ... and 50 more: https://git.openjdk.java.net/jdk/compare/74851c507bed9eb2e1e0b0eac3b53a74decb2588...master

Your commit was automatically rebased without conflicts.

Pushed as commit 224a30f.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.