> 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 14 additional commits since the last revision: - Merge branch 'master' into fill-performance - Restructure logic after comments - Revert copyright year - Move logic back to AMSI - Remove unused imports - Move logic to ScopedMemoryAccess for improved performance - Make minor updates after comments - Switch to bit checking instead of switch statement - Merge branch 'master' into fill-performance - Fix typo - ... and 4 more: https://git.openjdk.org/jdk/compare/726d0a24...d1641954 ------------- Changes: - all: https://git.openjdk.org/jdk/pull/20712/files - new: https://git.openjdk.org/jdk/pull/20712/files/5c2ce6ad..d1641954 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=20712&range=10 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20712&range=09-10 Stats: 8765 lines in 272 files changed: 5557 ins; 1502 del; 1706 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
