JDK-8350215 : [JMH] Improve jdk.incubator.vector.MaskedLogicOpts to test contiguous memory locations
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 25
  • Priority: P4
  • Status: Closed
  • Resolution: Duplicate
  • OS: generic
  • CPU: generic
  • Submitted: 2025-02-18
  • Updated: 2025-06-26
  • Resolved: 2025-06-26
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Related Reports
Duplicate :  
JDK-8346954 - [JMH] jdk.incubator.vector.MaskedLogicOpts fails due to IndexOutOfBoundsException
Description
See the discussion here https://github.com/openjdk/jdk/pull/22963#discussion_r1954358833

notes from [~jbhateja]. we'd better refactor this jmh test.

```
By making the index hop over 16 ints or 8 longs we may leave gaps in between for 128-bit and 256-bit species, this will unnecessarily include the noise due to cache misses or (on some targets) prefetching additional cache lines which are not usable, thereby impacting the crispness of microbenchmark.
```
Comments
This enhancement was discussed in JDK-8346954 at the first time. Initially we plan to do this enhancement in one separate JBS. Then, this enhancement was implemented together with JDK-8346954. Hence, I'd like to close this issue as a duplicate of JDK-8346954.
26-06-2025