On Fri, 19 Jul 2024 15:52:14 GMT, Aleksey Shipilev <sh...@openjdk.org> wrote:
>> [JDK-8240696](https://bugs.openjdk.org/browse/JDK-8240696) added the native >> method for `Reference.clear`. The original patch skipped intrinsification of >> this method, because we thought `Reference.clear` is not on a performance >> sensitive path. However, it shows up prominently on simple benchmarks that >> touch e.g. `ThreadLocal` cleanups. See the bug for an example profile with >> `RRWL` benchmarks. >> >> We need to know the actual oop strongness/weakness before we call into C2 >> Access API, this work models this after existing code for `refersTo0` >> intrinsics. C2 Access also need a support for `AS_NO_KEEPALIVE` for stores. >> >> Additional testing: >> - [x] Linux x86_64 server fastdebug, `all` >> - [x] Linux AArch64 server fastdebug, `all` > > Aleksey Shipilev has updated the pull request incrementally with one > additional commit since the last revision: > > Amend the test case for guaranteing it works under different compilation > regimes There is coming JEP for later G1 barriers expansion similar to ZGC. Will you still need this intrinsic after it? I assume Shenandoah will follow G1 later. ------------- PR Comment: https://git.openjdk.org/jdk/pull/20139#issuecomment-2379910959
