RFR: 8316961: Fallback implementations for 64-bit Atomic::{add,xchg} on 32-bit platforms [v4]

[Aleksey Shipilev]

On Tue, 24 Oct 2023 09:52:07 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I'm tempted to say the VM should simply fail to start if `supports_cx8` is not true - the kernel helper has been around for many years for ARMv6 so I can't imagine there would be platforms in use now that don't support it.

Same. That would also remove any need for lockers in Access API, AFAICS. Let's try that in a separate PR and see what happens?

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PR Comment: https://git.openjdk.org/jdk/pull/16252#issuecomment-1776896651