RFR: 8334060: Implementation of Late Barrier Expansion for G1 [v2]

[Roberto Castañeda Lozano]

On Fri, 16 Aug 2024 20:56:08 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Thanks, I will test and apply this one: it is simple enough and, in a way, even more intuitive than the current solution. For reference, I prototyped it [here](https://github.com/robcasloz/jdk/blob/JDK-8334060-g1-late-barrier-expansion-x64-optimizations/src/hotspot/cpu/x86/gc/g1/g1_x86_64.ad) (guarded by `UseOldValInPreBarriers`). It should also apply to `g1CompareAndSwapP`, right?
>
> Exactly.

Done (commit 9211280).

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PR Review Comment: https://git.openjdk.org/jdk/pull/19746#discussion_r1721433361