Add Test suites for Zcb sub extension from Code Size Reduction Extension (Zce)

[Abdulwadoodd]

Description

Code Size Reduction is the superset of the standard Compressed (C) extension. It consists of six sub-extensions:

• Zca
• Zcf
• Zcd
• Zcb
• Zcmp
• Zcmt

Out of these six sub-extensions zca, zcf, zcd contains the instructions which are part of the standard C extension. But zcb, zcmp, zcmt sub extensions add new instructions.

💡 Currently, this repository has test suites only for zca instructions.

Changes

• This PR adds the test suites for zcb instructions, which is one of six sub-extensions of RISC-V Code Size Reduction.
• Added a test macro that uses a single operand.

Related Pull Requests

• RISC-V CTG: PR #64 adds the test template and cover group format (cgf) to generate the tests suites for zcb.
• RISC-V Config: PR #128 adds the ISA strings for Code Size Reduction extension, which is used by RISCOF.

Related Issues

Issue #334 and #6

Ratified/Unratified Extensions

• Ratified

Reference Model Used

• Spike

⚠️ Support of Code Size Reduction Extension (Zcb, Zcmp, Zcmt) is not yet added to SAIL.

Mandatory Checklist:

• All tests are compliant with the test-format spec present in this repo
• Ran the new tests on RISCOF with Spike as a reference model successfully?
• Ran the new tests on RISCOF in coverage mode
• Link to Google-Drive folder containing the new coverage reports.
• Link to PR in RISCV-ISAC from which the reports were generated.
• Changelog entry created with a minor patch

[allenjbaum]

This needs the following checklist items completed:

• Ran the new tests on RISCOF in coverage mode
• Link to Google-Drive folder containing the new coverage reports.
  You'll probably get a conflict on the changlog because there are a bunch of inflight mreges, so be warned.

[davidharrishmc]

I would love to use these tests on CORE-V Wally. It would be easiest when they are integrated into riscv-arch-test. @Abdulwadoodd, do you have an anticipated schedule about completing the checklist items to finish the PR?

[Abdulwadoodd]

Hello prof. @davidharrishmc , generating coverage reports is a bit challenging for me due to the apparent lack of zcb support in ISAC's internal decoder. There were some alternatives highlighted in one of the sig-arch-test meetings. I will look to look into this and try to make it work by the end of the upcoming week.

[YazanHussnain-10x]

Coverage reports for the zcb instruction test suites (32/64) are available here

[Abdulwadoodd]

@allenjbaum ,
With the available coverage reports and the corresponding PR in RISCV ISAC by @YazanHussnain-10x, mandatory checklist has been completed and this PR is good to go (unless there is any change required).

[Abdulwadoodd]

hello @allenjbaum, pinging for a review on this PR

[allenjbaum]

manually updated version number to avoid duplicate

[Abdulwadoodd]

Thanks, @allenjbaum for approving the PR and pulling it in.
In addition to "manually updating the version number", it would have also required a "git rebase" to avoid the conflict and make a stable version release through CI. CHANGELOG.md isn't chronologically correct at the moment.

[allenjbaum]

Yea, I know.... I just don't know how to fix it, but it should be fixed (or do it properly so you wouldn't have to). I need to learn how to do this properly until we get a dev branch and submitters don't have to worry about changelog dates and version numbers.

…

On Mon, Dec 4, 2023 at 9:27 AM Abdul Wadood ***@***.***> wrote: Thanks, @allenjbaum <https://github.com/allenjbaum> for approving the PR and pulling it in. In addition to "manually updating the version number", it would have also required a "git rebase" to avoid the conflict and make a stable version release through CI. CHANGELOG.md isn't chronologically correct at the moment. — Reply to this email directly, view it on GitHub <#364 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHPXVJT4QUWXPHA26FCFU6TYHYBWVAVCNFSM6AAAAAAZNSG55GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQMZZGEZDOOJVGA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[leo-thomas-8390]

@Abdulwadoodd @allenjbaum @YazanHussnain-10x hello ,

I am trying to understand zcmp extension ( specifically cm.push and cm.pop instruction ) it would very helpful if you can share the config files and arch test files for the same
thank you