RFR: 8349452: Fix performance regression for Arrays.fill() with AVX512 [v13]

Fri Jan 30 19:29:45 UTC 2026

On Fri, 30 Jan 2026 17:13:49 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

> Vamsi should be able to confirm this. Regarding whether the slow down is due to masked stores stalls, that was my hypothesis > based on the optimization guide, excerpts of which Vamsi shared above.
>
The MaxVectorSize=64 for the platform used to collect the data in the PR's description for ByteMatrix fill workload.

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PR Comment: https://git.openjdk.org/jdk/pull/28442#issuecomment-3825339469