> [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 incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision: - Attempt at implementing ZGC AArch64 parts - Merge branch 'master' into JDK-8329597-intrinsify-reference-clear - Amend the test case for guaranteing it works under different compilation regimes - More precise barriers - Tests work - More touchups - Fixing the conditions, fixing the tests - Crude prototype, still failing the tests ------------- Changes: - all: https://git.openjdk.org/jdk/pull/20139/files - new: https://git.openjdk.org/jdk/pull/20139/files/437f2329..cba0a8e9 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=20139&range=03 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20139&range=02-03 Stats: 258786 lines in 3084 files changed: 211178 ins; 30411 del; 17197 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
