> This intrinsic is generally faster than the current implementation for Panama > segment operations for all writes larger than about 8 bytes in size, > increasing to more than 2* the performance on larger memory blocks on > Graviton 2, between "panama" (C2 generated, what we use now) and "unsafe" > (this intrinsic). > > > Benchmark (aligned) (size) Mode Cnt Score > Error Units > MemorySegmentFillUnsafe.panama true 262143 avgt 10 7295.638 ± > 0.422 ns/op > MemorySegmentFillUnsafe.panama false 262143 avgt 10 8345.300 ± > 80.161 ns/op > MemorySegmentFillUnsafe.unsafe true 262143 avgt 10 2930.594 ± > 0.180 ns/op > MemorySegmentFillUnsafe.unsafe false 262143 avgt 10 3136.828 ± > 0.232 ns/op
Andrew Haley has updated the pull request incrementally with three additional commits since the last revision: - AvoidUnalignedAccesses - Temp - The cherry on the cake ------------- Changes: - all: https://git.openjdk.org/jdk/pull/25147/files - new: https://git.openjdk.org/jdk/pull/25147/files/87eadb40..e5771988 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=25147&range=05 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25147&range=04-05 Stats: 20 lines in 1 file changed: 17 ins; 2 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/25147.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/25147/head:pull/25147 PR: https://git.openjdk.org/jdk/pull/25147
