8277440: riscv: Move UseVExt from product to experimental

[yhzhu20]

Currently, riscv port supports vector operations which is fully compatible with vector extension 1.0 spec. And we have passed tier 1-4 tests with option "-XX:+UseVExt" with QEMU.

Due to lack of native environment which supports vector extension 1.0, we cannot carry out tests for vector operations on real hardware. So we decided to move port-specific option UseVExt from product to experimental for now, and rename UseVExt to UseRVV.

This also fixes some typos in comments, and removes unused v extension instructions.

The test results on HiFive Unleashed board (rv64imafdc) and NeZha D1 board (rv64imafdcvu) are in line with expectations.

---

Progress

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• Commit message must refer to an issue
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Issue

• JDK-8277440: riscv: Move UseVExt from product to experimental

Reviewers

• Yadong Wang (@yadongw - Author)
• Fei Yang (@RealFYang - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/riscv-port pull/11/head:pull/11
$ git checkout pull/11

Update a local copy of the PR:
$ git checkout pull/11
$ git pull https://git.openjdk.java.net/riscv-port pull/11/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 11

View PR using the GUI difftool:
$ git pr show -t 11

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/riscv-port/pull/11.diff

[bridgekeeper]

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

[mlbridge]

Webrevs

• 01: Full - Incremental (5283eec6)
• 00: Full (829cb59d)

[yadongw]

lgtm

[RealFYang]

Thanks for cleanup. Looks good.

[yhzhu20]

/integrate

[openjdk]

@yhzhu20 This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8277440: riscv: Move UseVExt from product to experimental

Reviewed-by: yadongwang, fyang

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At the time when this comment was updated there had been 1 new commit pushed to the riscv-port branch:

• 398cec3: 8277392: riscv: Port missing trampoline logic from AArch64 platform

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[RealFYang]

/sponsor

[openjdk]

@yhzhu20
Your change (at version 5283eec) is now ready to be sponsored by a Committer.

[openjdk]

Going to push as commit dfde4e4.
Since your change was applied there has been 1 commit pushed to the riscv-port branch:

• 398cec3: 8277392: riscv: Port missing trampoline logic from AArch64 platform

Your commit was automatically rebased without conflicts.

[openjdk]

@RealFYang @yhzhu20 Pushed as commit dfde4e4.

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