On Thu, 11 Jul 2024 15:28:37 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` This pull request has now been integrated. Changeset: 7625b299 Author: Aleksey Shipilev <sh...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/7625b29920e95f9b754057fe0a2c4ab0afa5cb0c Stats: 362 lines in 26 files changed: 341 ins; 0 del; 21 mod 8329597: C2: Intrinsify Reference.clear Reviewed-by: rcastanedalo, eosterlund, kvn ------------- PR: https://git.openjdk.org/jdk/pull/20139
