RFR: 8368897: RISC-V: Cleanup RV_EXT_FEATURE_FLAGS & RV_NON_EXT_FEATURE_FLAGS [v4]

[Hamlin Li]

On Mon, 6 Oct 2025 12:28:13 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Hey, I don't get the premise.
> 
> VMVersion have a bunch of methods e.g VM_Version::supports_data_cache_line_flush() / VM_Version::get_current_sve_vector_length, etc.... Now we call some of them "non_ext_UnalignedScalar()", why ? And how is this a improvement ?
> 
> VM_Version methods is not related to whatever or not some information we need is part of an RVI extension.
> 
> E.g. VMVersion::unaligned_scalar() (hotspot don't do camel case) seems more reasonable.

I don't have a preference to the name, either `unaligned_scalar` or `non_ext_UnalignedScalar`. Let's see how others think about it, then I'll modify accordingly.

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PR Comment: https://git.openjdk.org/jdk/pull/27562#issuecomment-3371708640