RFR: 8373682: Test compiler/loopopts/superword/TestReinterpretAndCast.java fails on x86_64 with AVX but without f16c

[Christian Hagedorn]

On Tue, 16 Dec 2025 17:45:43 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> The IR rules of the test failed because we expected that `VectorCastF2HF` and `VectorCastHF2F` are available on `AVX`, but actually we need `f16c`. On Sandy Bridge we have `AVX` but not `f16c`, so the IR rules fail on those machines.
> 
> Solution: require `f16c` feature.

Looks good, thanks!

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Marked as reviewed by chagedorn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28852#pullrequestreview-3586651256