RFR: 8320363: ppc64 TypeEntries::type_unknown logic looks wrong, missed optimization opportunity

[Martin Doerr]

On Thu, 23 Nov 2023 16:43:19 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> The `TypeEntries::type_unknown` logic uses a wrong register. This results in unnecessary profile updates if the type is already flagged as unknown. Doesn't cause VM errors, but may affect performance. However, I haven't seen performance impact in larger benchmarks.

Thanks for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/16801#issuecomment-1825737316