On Sat, 20 Apr 2024 22:31:48 GMT, Scott Gibbons <sgibb...@openjdk.org> wrote:
>> This code makes an intrinsic stub for `Unsafe::setMemory` for x86_64. See >> [this PR](https://github.com/openjdk/jdk/pull/16760) for discussion around >> this change. >> >> Overall, making this an intrinsic improves overall performance of >> `Unsafe::setMemory` by up to 4x for all buffer sizes. >> >> Tested with tier-1 (and full CI). I've added a table of the before and >> after numbers for the JMH I ran (`MemorySegmentZeroUnsafe`). >> >> [setMemoryBM.txt](https://github.com/openjdk/jdk/files/14808974/setMemoryBM.txt) > > Scott Gibbons has updated the pull request with a new target base due to a > merge or a rebase. The pull request now contains 37 commits: > > - Merge branch 'openjdk:master' into setMemory > - Fix UnsafeCopyMemoryMark scope issue > - Long to short jmp; other cleanup > - Review comments > - Address review comments; update copyright years > - Add enter() and leave(); remove Windows-specific register stuff > - Fix memory mark after sync to upstream > - Merge branch 'openjdk:master' into setMemory > - Set memory test (#23) > > * Even more review comments > > * Re-write of atomic copy loops > > * Change name of UnsafeCopyMemory{,Mark} to UnsafeMemory{Access,Mark} > > * Only add a memory mark for byte unaligned fill > > * Remove MUSL_LIBC ifdef > > * Remove MUSL_LIBC ifdef > - Set memory test (#22) > > * Even more review comments > > * Re-write of atomic copy loops > > * Change name of UnsafeCopyMemory{,Mark} to UnsafeMemory{Access,Mark} > > * Only add a memory mark for byte unaligned fill > - ... and 27 more: https://git.openjdk.org/jdk/compare/6d569961...1122b500 This introduced a regression, see [JDK-8331033](https://bugs.openjdk.org/browse/JDK-8331033). ------------- PR Comment: https://git.openjdk.org/jdk/pull/18555#issuecomment-2074459781
