8284937: riscv: should not allocate special register for temp

[zifeihan]

Hi, please help review this backport to riscv-port-jdk11u.
Backport of JDK-8284937. The original patch cannot be directly applied because riscv-port-jdk11u doesn't have riscv_v.ad and doesn't have c2_MacroAssembler, which uses MacroAssembler.

Testing:

• Run tier1-3 tests on SOPHON SG2042 (release)

---

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-8284937: riscv: should not allocate special register for temp (Bug - P3)

Reviewers

• Fei Yang (@RealFYang - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/riscv-port-jdk11u.git pull/17/head:pull/17
$ git checkout pull/17

Update a local copy of the PR:
$ git checkout pull/17
$ git pull https://git.openjdk.org/riscv-port-jdk11u.git pull/17/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 17

View PR using the GUI difftool:
$ git pr show -t 17

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/riscv-port-jdk11u/pull/17.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back gcao! 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]

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

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

8284937: riscv: should not allocate special register for temp

Reviewed-by: 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 10 new commits pushed to the riscv-port branch:

• 34f7641: Merge branch 'master' into riscv-port
• 0073602: 8297798: Timeout with DTLSOverDatagram test template
• 979daf5: 8264152: javax/net/ssl/DTLS/RespondToRetransmit.java timed out
• 5d4de36: 8286705: GCC 12 reports use-after-free potential bugs
• 741b340: 8243010: Test support: Customizable Hex Printer
• 518e797: 8326661: sun/java2d/cmm/ColorConvertOp/ColConvTest.java assumes profiles were generated by LCMS
• 29a08f7: 8210988: Improved handling of compiler warnings in the build
• 4117953: 8273831: PrintServiceLookup spawns 2 threads in the current classloader, getting orphaned
• d98b460: 8317507: C2 compilation fails with "Exceeded _node_regs array"
• d4b0021: 8291893: riscv: remove fence.i used in user space

Please see this link for an up-to-date comparison between the source branch of this pull request and the riscv-port branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this 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).

[openjdk]

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

[mlbridge]

Webrevs

• 00: Full (2a9471fb)

[RealFYang]

Looks good.

[zifeihan]

/integrate

[openjdk]

@zifeihan
Your change (at version 2a9471f) is now ready to be sponsored by a Committer.

[RealFYang]

/sponsor

[openjdk]

Going to push as commit c7d3a44.
Since your change was applied there have been 10 commits pushed to the riscv-port branch:

• 34f7641: Merge branch 'master' into riscv-port
• 0073602: 8297798: Timeout with DTLSOverDatagram test template
• 979daf5: 8264152: javax/net/ssl/DTLS/RespondToRetransmit.java timed out
• 5d4de36: 8286705: GCC 12 reports use-after-free potential bugs
• 741b340: 8243010: Test support: Customizable Hex Printer
• 518e797: 8326661: sun/java2d/cmm/ColorConvertOp/ColConvTest.java assumes profiles were generated by LCMS
• 29a08f7: 8210988: Improved handling of compiler warnings in the build
• 4117953: 8273831: PrintServiceLookup spawns 2 threads in the current classloader, getting orphaned
• d98b460: 8317507: C2 compilation fails with "Exceeded _node_regs array"
• d4b0021: 8291893: riscv: remove fence.i used in user space

Your commit was automatically rebased without conflicts.

[openjdk]

@RealFYang @zifeihan Pushed as commit c7d3a44.

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