RFR: 8315338: RISC-V: Change flags for stable extensions to non-experimental

[Feilong Jiang]

On Wed, 6 Sep 2023 08:55:59 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Hi all, please consider.
> 
> These flags can be automatically turned on if you are using a 6.5 kernel with the proper hardware.
> So they are not considered experimental.
> 
> Running tier1

There is still no hardware support for these extensions for now. IMHO, it's better to keep the experimental flags for them. We could add some checks to prevent enabling these experimental extensions by default:

if (!UnlockExperimentalVMOptions && UseRVV) {
  FLAG_SET_DEFAULT(UseRVV, false);
}

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PR Comment: https://git.openjdk.org/jdk/pull/15585#issuecomment-1717530894