RFR: 8365147: AArch64: Replace DMB + LD + DMB with LDAR for C1 volatile field loads [v4]

[Andrew Haley]

On Fri, 27 Feb 2026 23:25:32 GMT, Ruben <duke at openjdk.org> wrote:

> This would add the `membar_acquire` where in case of `needs_atomic && !is_volatile` in `BarrierSetC1::load_at_resolved` it would have been skipped.

The only circumstances in which this is possible ls a `long` field on a 32-bit system. If a `membar_acquire` in such circumstances is a problem, we can hadle it separately.

 To mitigate this would it be suitable to add a `needs_acquire` parameter to `volatile_field_load`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26748#discussion_r2871556894