On Fri, 9 May 2025 14:11:27 GMT, Andrew Haley <a...@openjdk.org> wrote:
> 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 This pull request has now been integrated. Changeset: a6ebcf61 Author: Andrew Haley <a...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/a6ebcf61eb522a1bcfc9f2169d42974af3883b00 Stats: 127 lines in 3 files changed: 122 ins; 0 del; 5 mod 8354674: AArch64: Intrinsify Unsafe::setMemory Reviewed-by: adinn ------------- PR: https://git.openjdk.org/jdk/pull/25147
