> [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 ------------- Changes: - all: https://git.openjdk.org/jdk/pull/20139/files - new: https://git.openjdk.org/jdk/pull/20139/files/79ece901..437f2329 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=20139&range=02 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20139&range=01-02 Stats: 36 lines in 1 file changed: 18 ins; 7 del; 11 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
