> 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 incrementally with one additional commit since the last revision: Change fill routines * Even more review comments * Re-write of atomic copy loops ------------- Changes: - all: https://git.openjdk.org/jdk/pull/18555/files - new: https://git.openjdk.org/jdk/pull/18555/files/6e731c86..405e4e05 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=18555&range=14 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18555&range=13-14 Stats: 251 lines in 1 file changed: 103 ins; 117 del; 31 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
