8296435: RISC-V: Small refactoring for increment/decrement

[feilongjiang]

The increment and decrement use t1 as tmp register, while t1 was the flag register in c2.
We can make tmp registers as the arguments of increment and decrement so that c2 can reuse them.

Testing:

full tier1 tests passed on Linux-riscv64 HiFive Unmathced board with release build

---

Progress

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Issue

• JDK-8296435: RISC-V: Small refactoring for increment/decrement

Reviewers

• Fei Yang (@RealFYang - Reviewer)

Reviewing

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[openjdk]

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[mlbridge]

Webrevs

• 00: Full (94cb956e)

[RealFYang]

Looks good. Thanks.

[openjdk]

@feilongjiang 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:

8296435: RISC-V: Small refactoring for increment/decrement

Reviewed-by: fyang

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At the time when this comment was updated there had been 17 new commits pushed to the master branch:

• 76790ad: 8295673: Deprecate and disable legacy parallel class loading workaround for non-parallel-capable class loaders
• b6738c1: 8295663: Rephrase introduction to testing.md
• 7e85b41: 8296154: [macos] Change "/Applications" to "Applications" in DMG image
• 60db5f2: 8294020: improve errors for record declarations
• 520db1e: 8296485: BuildEEBasicConstraints.java test fails with SunCertPathBuilderException
• b29817a: 8296479: Remove stray comment about POST_STRIP_CMD
• b6ea69c: 8296480: java/security/cert/pkix/policyChanges/TestPolicy.java is failing
• 3baad06: 8295953: Use enhanced-for cycle instead of Enumeration in sun.security
• ba303c0: 8295893: Improve printing of Constant Pool Cache Entries
• f8b2574: 8296137: diags-examples.xml is broken
• ... and 7 more: https://git.openjdk.org/jdk/compare/91292d56a9c2b8010466d105520e6e898ae53679...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.

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➡️ 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).

[feilongjiang]

@RealFYang -- Thanks!

/integrate

[openjdk]

@feilongjiang
Your change (at version 94cb956) is now ready to be sponsored by a Committer.

[RealFYang]

/sponsor

[openjdk]

Going to push as commit 4c80dff.
Since your change was applied there have been 18 commits pushed to the master branch:

• 47d2c7b: 8295376: Improve debug agent virtual thread performance when no debugger is attached
• 76790ad: 8295673: Deprecate and disable legacy parallel class loading workaround for non-parallel-capable class loaders
• b6738c1: 8295663: Rephrase introduction to testing.md
• 7e85b41: 8296154: [macos] Change "/Applications" to "Applications" in DMG image
• 60db5f2: 8294020: improve errors for record declarations
• 520db1e: 8296485: BuildEEBasicConstraints.java test fails with SunCertPathBuilderException
• b29817a: 8296479: Remove stray comment about POST_STRIP_CMD
• b6ea69c: 8296480: java/security/cert/pkix/policyChanges/TestPolicy.java is failing
• 3baad06: 8295953: Use enhanced-for cycle instead of Enumeration in sun.security
• ba303c0: 8295893: Improve printing of Constant Pool Cache Entries
• ... and 8 more: https://git.openjdk.org/jdk/compare/91292d56a9c2b8010466d105520e6e898ae53679...master

Your commit was automatically rebased without conflicts.

[openjdk]

@RealFYang @feilongjiang Pushed as commit 4c80dff.

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