8337780: RISC-V: C2: Change C calling convention for sp to NS

[RealFYang]

Clean backport of JDK-8337780 to reduce frame size by 16 bytes and improve performance for some C2 runtime stubs as we do not have to save sp on the method entry. Gtest & Tier1-3 tested on linux-riscv64 platform.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8337780 needs maintainer approval

Issue

• JDK-8337780: RISC-V: C2: Change C calling convention for sp to NS (Enhancement - P4 - Approved)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/2823/head:pull/2823
$ git checkout pull/2823

Update a local copy of the PR:
$ git checkout pull/2823
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/2823/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2823

View PR using the GUI difftool:
$ git pr show -t 2823

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Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/2823.diff

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[bridgekeeper]

👋 Welcome back fyang! 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]

@RealFYang 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:

8337780: RISC-V: C2: Change C calling convention for sp to NS

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 17 new commits pushed to the master branch:

• b2c92fd: 8319817: Charset constructor should make defensive copy of aliases
• 42b5e12: 8287003: InputStreamReader::read() can return zero despite writing a char in the buffer
• 3ddae29: 8331789: ubsan: deoptimization.cpp:403:29: runtime error: load of value 208, which is not a valid value for type 'bool'
• acfce69: 8332904: ubsan ppc64le: c1_LIRGenerator_ppc.cpp:581:21: runtime error: signed integer overflow: 9223372036854775807 + 1 cannot be represented in type 'long int'
• a9d755c: 8336342: Fix known X11 library locations in sysroot
• 7374e7d: 8336343: Add more known sysroot library locations for ALSA
• fd38e86: 8338286: GHA: Demote x86_32 to hotspot build only
• ada58fa: 8336854: CAInterop.java#actalisauthenticationrootca conflicted with /manual and /timeout
• 6f382d1: 8332903: ubsan: opto/output.cpp:1002:18: runtime error: load of value 171, which is not a valid value for type 'bool'
• e50b815: 8339081: Bump update version for OpenJDK: jdk-17.0.14
• ... and 7 more: https://git.openjdk.org/jdk17u-dev/compare/be4f913efab46b601f7cc472d654b4da883df152...master

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.

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

[openjdk]

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

[openjdk]

⚠️ @RealFYang 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.

[mlbridge]

Webrevs

• 00: Full (d01dbe28)

[RealFYang]

/approval request Clean backport of JDK-8337780 to reduce frame size by 16 bytes and improve performance for some C2 runtime stubs as we do not have to save sp on the method entry. This is a RISC-V specific change. Tier1-3 tested on linux-riscv64 platform.

[openjdk]

@RealFYang
8337780: The approval request has been created successfully.

[RealFYang]

/integrate

[openjdk]

Going to push as commit 9150f50.
Since your change was applied there have been 17 commits pushed to the master branch:

• b2c92fd: 8319817: Charset constructor should make defensive copy of aliases
• 42b5e12: 8287003: InputStreamReader::read() can return zero despite writing a char in the buffer
• 3ddae29: 8331789: ubsan: deoptimization.cpp:403:29: runtime error: load of value 208, which is not a valid value for type 'bool'
• acfce69: 8332904: ubsan ppc64le: c1_LIRGenerator_ppc.cpp:581:21: runtime error: signed integer overflow: 9223372036854775807 + 1 cannot be represented in type 'long int'
• a9d755c: 8336342: Fix known X11 library locations in sysroot
• 7374e7d: 8336343: Add more known sysroot library locations for ALSA
• fd38e86: 8338286: GHA: Demote x86_32 to hotspot build only
• ada58fa: 8336854: CAInterop.java#actalisauthenticationrootca conflicted with /manual and /timeout
• 6f382d1: 8332903: ubsan: opto/output.cpp:1002:18: runtime error: load of value 171, which is not a valid value for type 'bool'
• e50b815: 8339081: Bump update version for OpenJDK: jdk-17.0.14
• ... and 7 more: https://git.openjdk.org/jdk17u-dev/compare/be4f913efab46b601f7cc472d654b4da883df152...master

Your commit was automatically rebased without conflicts.

[openjdk]

@RealFYang Pushed as commit 9150f50.

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