RFR: 8372845: Fold identity hash code if object is constant

Tue Dec 2 20:56:18 UTC 2025

On Tue, 2 Dec 2025 20:36:50 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> I'm not sure it makes sense to support Object::hashCode unless C2 can eliminate generate_virtual_guard for a constant receiver. I'd just limit constant folding to !is_virtual case for now.

Or, alternatively, inspect constant object's v-table during compilation and ensure that corresponding slot points at `Object::hashCode`.

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PR Comment: https://git.openjdk.org/jdk/pull/28589#issuecomment-3603919570