8374525: RISC-V: Several masked float16 vector operations are not supported

[DingliZhang]

Hi,
Can you help to review this patch? Thanks!

Currently, the masked versions of the following 8 Float16 operations are not supported.
But we return true in Matcher::match_rule_supported_vector_masked for these operations
on RISC-V platforms with Zvfh. We need to explicitly disable them on this CPU platform
to make it clear.

 Op_AddVHF:
 Op_SubVHF:
 Op_MulVHF:
 Op_DivVHF:
 Op_MaxVHF:
 Op_MinVHF:
 Op_SqrtVHF:
 Op_FmaVHF:

When the support for Float16 vector classes is added in VectorAPI and the masked
Float16 IR can be generated, these masked operations will be enabled and relevant
backend support added.

---

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Issue

• JDK-8374525: RISC-V: Several masked float16 vector operations are not supported (Bug - P4)

Reviewers

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

Reviewing

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[bridgekeeper]

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[openjdk]

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

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8374525: RISC-V: Several masked float16 vector operations are not supported

Reviewed-by: fjiang, fyang

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At the time when this comment was updated there had been 103 new commits pushed to the master branch:

• e676c9d: 8357258: x86: Improve receiver type profiling reliability
• 1630382: 8373704: Improve "SocketException: Protocol family unavailable" message
• 6eaabed: 8373722: [TESTBUG] compiler/vectorapi/TestVectorOperationsWithPartialSize.java fails intermittently
• ... and 100 more: https://git.openjdk.org/jdk/compare/c16ce929c7bc127fe18d3faa037d81c2760a44a2...master

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[mlbridge]

Webrevs

• 00: Full (96b35749)

[feilongjiang]

Nice catch!

[RealFYang]

Looks reasonable.

[DingliZhang]

Thanks all for the review!
/integrate

[openjdk]

Going to push as commit df5b49e.
Since your change was applied there have been 117 commits pushed to the master branch:

• 532a0a6: 8372950: Pem.pemEncoded should cache the Pattern
• 5df183b: 8373476: (tz) Update Timezone Data to 2025c
• 938bbd5: 8374518: C1: Remove dead LinearScanStatistic::Counter::counter_fpu_stack
• ... and 114 more: https://git.openjdk.org/jdk/compare/c16ce929c7bc127fe18d3faa037d81c2760a44a2...master

Your commit was automatically rebased without conflicts.

[openjdk]

@DingliZhang Pushed as commit df5b49e.

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