RFR: 8367627: C2: Missed Ideal() optimization opportunity with MemBar [v3]

[Christian Hagedorn]

On Mon, 5 Jan 2026 07:41:07 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Moved it to `compiler/c2/igvn`
>
> I guess we could clean this up at some point. We now have `igvn`, `c2/igvn`, and `c2/gvn`. And some other C2 specific tests are in folders inside `c2` while others are in the base directory.

Suggestion:

 * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.


You are probably also the first one this year to change `node.cpp` and `graphKit.cpp`, so we need an update there as well.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28448#discussion_r2660564360