RFR (S) 8229416: Shenandoah: Demote or remove ShenandoahOptimize*Final optimizations
shade at redhat.com
Mon Aug 12 17:31:00 UTC 2019
On 8/12/19 6:21 PM, Roman Kennke wrote:
>> The first optimization is eliminating barriers on constants, that are handled separately, and never
>> get exposed as from-space objects. We should keep that optimization on, but to add future debugging,
>> we would want to keep the flag as diagnostic.
> I believe this optimization actually does nothing (interesting). C2
> already optimizes access to static-finals to inlined constants, and we
> eliminate barriers on inlined constants. We might want to check & verify
> this, but I strongly suspect this optimization is actually a no-op (at
> least in most/all interesting cases).
It would rather keep current behavior as is, and treat this as the cleanup. We can remove
ShenandoahOptimizeStaticFinals once we prove it is irrelevant.
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