> 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 19 commits: - Merge master - Set memory test (#16) Add framework for other platforms. Moved fill_to_memory_atomic back to the .cpp from the .hpp in order to get 32-bit fixed. - Address review comments (#15) * Address review comments - Add movq to locate_operand - Oops - Fixed generate_fill when count > 0x80000000 - Fix Windows - Addressing review comments. - Remove dead code - Use non-sse fill (old left in) - ... and 9 more: https://git.openjdk.org/jdk/compare/31ee5108...41ffcc32 ------------- Changes: https://git.openjdk.org/jdk/pull/18555/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18555&range=09 Stats: 734 lines in 38 files changed: 680 ins; 5 del; 49 mod Patch: https://git.openjdk.org/jdk/pull/18555.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/18555/head:pull/18555 PR: https://git.openjdk.org/jdk/pull/18555
