RFR: 8290892: C2: Intrinsify Reference.reachabilityFence [v8]

[Vladimir Ivanov]

On Fri, 12 Sep 2025 13:55:38 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Yes, maybe say what the general problem is, and make a concrete example. I'm currently a bit struggling to think of one that is relevant.
>
> Ah yes: we may for example move a store out (after) the loop. But wait. We can't move a store across a SafePoint, so that's not a good example.

For example, loads suffer from the same problems as stores, but constraints on them are more lax.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25315#discussion_r2356613585