On 4/7/19 7:18 PM, Roman Kennke wrote: > On 4/2/19 10:12 PM, Roman Kennke wrote: >>> - No more need for object equals barriers. >> >> I'm pleased about that. I really hated the AArch64 Shenandoah CAS! > > I'm sorry to disappoint you, but the CAS barrier is still needed. The > memory location may still legally hold a from-space reference, and > comparing that to a to-space reference needs some special care. And > yes, ZGC has a similar problem as far as I know.
That's interesting. Could we not simply promote the reference in the reference field we're CASing, then do a normal CAS? -- Andrew Haley Java Platform Lead Engineer Red Hat UK Ltd. <https://www.redhat.com> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671
