RFR: 8354572: Turn off AlwaysMergeDMB for Ampere CPU by default

Tue Apr 15 09:04:56 UTC 2025

On Tue, 15 Apr 2025 08:16:08 GMT, Liming Liu <lliu at openjdk.org> wrote:

> Hi all, I found that "dmb ishst + dmb ishld" is obviously faster than "dmb ish" on Ampere CPU, so I submit this patch to make the former be default.

Please post the numbers here.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/24652#issuecomment-2804348250