8305728: RISC-V: Use bexti instruction to do single-bit testing

[DingliZhang]

Hi, please review this backport to riscv-port-jdk17u.
Backport of JDK-8305728. The original patch cannot be directly applied because jdk17u has no JDK-8299089 and JDK-8301995.

Testing:

• tier1-3 tests on QEMU-System w/ and w/o UseZbs (release build)
• tier1-3 tests on unmatched board w/o UseZbs (release build)

---

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

Issue

• JDK-8305728: RISC-V: Use bexti instruction to do single-bit testing

Reviewers

• Feilong Jiang (@feilongjiang - Author)
• Fei Yang (@RealFYang - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/riscv-port-jdk17u.git pull/65/head:pull/65
$ git checkout pull/65

Update a local copy of the PR:
$ git checkout pull/65
$ git pull https://git.openjdk.org/riscv-port-jdk17u.git pull/65/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 65

View PR using the GUI difftool:
$ git pr show -t 65

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/riscv-port-jdk17u/pull/65.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back dzhang! 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.

[openjdk]

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

[mlbridge]

Webrevs

• 00: Full (360ed753)

[RealFYang]

Looks good. Thanks.

[openjdk]

@DingliZhang 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:

8305728: RISC-V: Use bexti instruction to do single-bit testing

Reviewed-by: fjiang, fyang

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been no new commits pushed to the riscv-port branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential automatic rebasing, please check the documentation for the /integrate command for further details.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@RealFYang) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[DingliZhang]

Thanks for the review!
/integrate

[openjdk]

@DingliZhang
Your change (at version 360ed75) is now ready to be sponsored by a Committer.

[RealFYang]

/sponsor

[openjdk]

Going to push as commit 170152a.

[openjdk]

@RealFYang @DingliZhang Pushed as commit 170152a.

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