On Wed, 13 Aug 2025 10:08:33 GMT, Per Minborg <pminb...@openjdk.org> wrote:
>> This PR proposes to use overlapping memory areas in >> `SegmentBulkOperations::copy`, similar to what is proposed for >> `SegmentBulkOperations::fill` in https://github.com/openjdk/jdk/pull/25383. >> >> This PR passes `tier1`, `tier2`, and `tier3`testing on multiple platforms. > > 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 12 additional > commits since the last revision: > > - Revert comment > - Revert change in AMSI > - Back paddle on the branchless overlap method > - Merge branch 'master' into copy-overlap > - Fix comment > - Simplify > - Update copyright year > - Add a branchless overlaps method > - Optimize copy for certain lengths > - Add methods to ScopedMemoryAccess > - ... and 2 more: https://git.openjdk.org/jdk/compare/02caf89b...1a1606e2 Here are the latest performance figures (Mac M1): Bytes | Base | Patch | Improvement -- | -- | -- | -- 2 | 3.184 | 2.832 | 11.06% 3 | 3.162 | 2.837 | 10.28% 4 | 3.344 | 2.835 | 15.22% 5 | 3.31 | 2.826 | 14.62% 6 | 3.328 | 2.848 | 14.42% 7 | 3.289 | 2.826 | 14.08% 8 | 4.139 | 2.747 | 33.63% 12 | 4.709 | 2.871 | 39.03% 16 | 4.173 | 3.782 | 9.37% 24 | 4.239 | 4.085 | 3.63% 64 | 4.86 | 4.815 | 0.93% <img width="776" height="480" alt="image" src="https://github.com/user-attachments/assets/4870b554-7170-49b9-84aa-47540fd1efab"; /> ------------- PR Comment: https://git.openjdk.org/jdk/pull/26672#issuecomment-3183267461
