> [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: > - [ ] Linux x86_64 server fastdebug, `all` > - [ ] Linux AArch64 server fastdebug, `all`
Aleksey Shipilev has updated the pull request incrementally with two additional commits since the last revision: - Fix other arches - Tighten up comments in Reference javadoc ------------- Changes: - all: https://git.openjdk.org/jdk/pull/20139/files - new: https://git.openjdk.org/jdk/pull/20139/files/cba0a8e9..8ba681a4 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=20139&range=04 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20139&range=03-04 Stats: 16 lines in 4 files changed: 7 ins; 4 del; 5 mod Patch: https://git.openjdk.org/jdk/pull/20139.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/20139/head:pull/20139 PR: https://git.openjdk.org/jdk/pull/20139
