JDK-8317976 : Optimize SIMD sort for AMD Zen 4
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 22
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • OS: linux
  • CPU: x86
  • Submitted: 2023-10-11
  • Updated: 2023-10-12
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8309130 - x86_64 AVX512 intrinsics for Arrays.sort methods (int, long, float and double arrays)
Relates :  
JDK-8317763 - Follow-up to AVX512 intrinsics for Arrays.sort() PR
Description
In JDK-8309130 Array sort was optimized using SIMD instructions for x86_64. 
This optimization needed to be disabled for AMD Zen 4 in JDK-8317763 due to bad performance of compressstoreu as per https://www.reddit.com/r/java/comments/171t5sj/heads_up_openjdk_implementation_of_avx512_based/.