On Mon, 26 Aug 2024 11:47:11 GMT, Per Minborg <pminb...@openjdk.org> wrote:
> 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. This pull request has now been integrated. Changeset: 7a418fc0 Author: Per Minborg <pminb...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/7a418fc07464fe359a0b45b6d797c65c573770cb Stats: 277 lines in 3 files changed: 274 ins; 0 del; 3 mod 8338967: Improve performance for MemorySegment::fill Reviewed-by: mcimadamore, psandoz ------------- PR: https://git.openjdk.org/jdk/pull/20712
