8390521: RISC-V: Clean up vector register dispatch in MachSpillCopyNode::implementation

[zifeihan]

Hi, this patch is a backport of openjdk/jdk#32416
Because JDK-8379867 hasn't been backported to jdk25u-dev yet, this has been adjusted compared to the original openjdk/jdk#32416 (bottom_type()->isa_pvectmask() → bottom_type()->isa_vectmask()).
The main purposes of this backport are: 1. to eliminate some unnecessary type checks. 2. With this backport, readability and maintainability are also improved.

Testing

• make test TEST="hotspot_vector_1 hotspot_vector_2 jdk_vector jdk_vector_sanity" with fastdebug
• make test TEST="hotspot:tier1 hotspot:tier2 hotspot:tier3" with fastdebug

This is a risc-v specific change. risk is low.

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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
• JDK-8390521 needs maintainer approval

Issue

• JDK-8390521: RISC-V: Clean up vector register dispatch in MachSpillCopyNode::implementation (Enhancement - P4 - Requested)

Reviewers

• Fei Yang (@RealFYang - Reviewer)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/748/head:pull/748
$ git checkout pull/748

Update a local copy of the PR:
$ git checkout pull/748
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/748/head

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Checkout this PR locally:
$ git pr checkout 748

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Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/748.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back gcao! 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]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[RealFYang]

Thanks!

[openjdk]

⚠️ @zifeihan This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[zifeihan]

/approval request
Hi, this patch is a backport of openjdk/jdk#32416
Because JDK-8379867 hasn't been backported to jdk25u-dev yet, this has been adjusted compared to the original openjdk/jdk#32416 (bottom_type()->isa_pvectmask() → bottom_type()->isa_vectmask()).
The main purposes of this backport are: 1. to eliminate some unnecessary type checks. 2. With this backport, readability and maintainability are also improved.
Testing:

make test TEST="hotspot_vector_1 hotspot_vector_2 jdk_vector jdk_vector_sanity" with fastdebug ok
make test TEST="hotspot:tier1 hotspot:tier2 hotspot:tier3" with fastdebug ok

[mlbridge]

Webrevs

• 00: Full (eecb7f5f)

[openjdk]

@zifeihan
8390521: The approval request has been created successfully.