> The performance of the `MemorySegment::fil` can be improved by replacing the > `checkAccess()` method call with calling `checkReadOnly()` instead (as the > bounds of the segment itself do not need to be checked). > > Also, smaller segments can be handled directly by Java code rather than > transitioning to native code. > > Here is how the `MemorySegment::fill` performance is improved by this PR: > >  > > Operations involving 8 or more bytes are delegated to native code whereas > smaller segments are handled via a switch rake. > > It should be noted that `Arena::allocate` is using `MemorySegment::fil`. > Hence, this PR will also have a positive effect on memory allocation > performance.
Per Minborg 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 six additional commits since the last revision: - Merge branch 'master' into fill-performance - Fix typo - Add a comment about the old switch type - Remove unused import - Reduce kick-in size and add test - Initial implementation ------------- Changes: - all: https://git.openjdk.org/jdk/pull/20712/files - new: https://git.openjdk.org/jdk/pull/20712/files/b28f97fa..6fb6eefa Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=20712&range=04 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20712&range=03-04 Stats: 1722 lines in 197 files changed: 1151 ins; 181 del; 390 mod Patch: https://git.openjdk.org/jdk/pull/20712.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/20712/head:pull/20712 PR: https://git.openjdk.org/jdk/pull/20712
