RFR: 8329597: C2: Intrinsify Reference.clear [v3]

[Aleksey Shipilev]

On Fri, 27 Sep 2024 17:44:38 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Is ZGC affected by this? I see only G1 and Shenandoah changes.

Good question.

ZGC expands the GC barriers late. This is why the IR test configuration that tests ZGC shows the same result as with other collectors: no additional fluff in IR. I would not expect we need anything else in late expansion for ZGC for Reference.clear, but maybe I am tired and cannot see it. Can you confirm this is fine, @fisk?

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PR Comment: https://git.openjdk.org/jdk/pull/20139#issuecomment-2379881102