On Wed, 9 Oct 2024 08:44:34 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 with a new target base due to a > merge or a rebase. The pull request now contains 18 commits: > > - Simplify: just do keep alive checks > - Merge branch 'master' into JDK-8329597-intrinsify-reference-clear > - More precise bit-unmasks > - Reconcile with late barrier expansion in G1 > - Merge branch 'master' into JDK-8329597-intrinsify-reference-clear > - Review comments > - Merge branch 'master' into JDK-8329597-intrinsify-reference-clear > - Also dispatch to slow-path on other arches > - Fix other arches > - Tighten up comments in Reference javadoc > - ... and 8 more: https://git.openjdk.org/jdk/compare/580eb62d...9f7ad7ab Thanks for review, folks. I am re-running testing locally here. Would appreciate if you can give this patch a spin through your CIs as well. ------------- PR Comment: https://git.openjdk.org/jdk/pull/20139#issuecomment-2413348085
