RFR: 8324751: C2 SuperWord: Aliasing Analysis runtime check [v11]

[Emanuel Peter]

On Tue, 19 Aug 2025 15:07:01 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> If I'm doing something, then probably automatically disable `UseAutoVectorizationSpeculativeAliasingChecks`.
>
> Yes, you can do that in `CompilerConfig::ergo_initialize()` as we do for other compiler's flags. That is what I am asking for.  I don't think you need to do that in `check_args_consistency()` because flags don't conflict.

Ok, I disable the flag as you suggested.

[empeter at emanuel bin]$ ./java -XX:-LoopMultiversioning -XX:-UseAutoVectorizationPredicate --version
Java HotSpot(TM) 64-Bit Server VM warning: Disabling UseAutoVectorizationSpeculativeAliasingChecks, because neither of the following is enabled:  LoopMultiversioning UseAutoVectorizationPredicate
java 26-internal 2026-03-17
Java(TM) SE Runtime Environment (fastdebug build 26-internal-2025-08-19-0807278.empeter...)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 26-internal-2025-08-19-0807278.empeter..., mixed mode)

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PR Review Comment: https://git.openjdk.org/jdk/pull/24278#discussion_r2288001195