On Wed, 20 Aug 2025 08:51:24 GMT, Per Minborg <[email protected]> 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 incrementally with one additional > commit since the last revision: > > Do not use overlapping copy I've removed overlapping copy, which impacts performance a bit: Bytes | Base | Patch | Improvement -- | -- | -- | -- 2 | 3.184 | 2.97 | 6.72% 3 | 3.162 | 3.011 | 4.78% 4 | 3.344 | 3.117 | 6.79% 5 | 3.31 | 3.15 | 4.83% 6 | 3.328 | 3.382 | -1.62% 7 | 3.289 | 3.441 | -4.62% 8 | 4.139 | 3.147 | 23.97% 12 | 4.709 | 4.694 | 0.32% 16 | 4.173 | 3.792 | 9.13% 24 | 4.239 | 3.903 | 7.93% 64 | 4.86 | 4.736 | 2.55% <img width="806" height="496" alt="image" src="https://github.com/user-attachments/assets/3aaa4cec-dfe5-4235-b9dd-33c017dd7970"; /> The patch still gives significant performance improvements for likely copy sizes like 8 and 16 bytes. ------------- PR Comment: https://git.openjdk.org/jdk/pull/26672#issuecomment-3204893330
