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  1. JDK
  2. JDK-8186203

Consider unrolling selected hashCode loops

    Details

    • Type: Enhancement
    • Status: Closed
    • Priority: P3
    • Resolution: Duplicate
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • CPU:
      generic
    • OS:
      generic

      Description

      Richard Startin points out that C2 (still) can't vectorize simple hashCode loops:

        https://richardstartin.com/2017/07/23/still-true-in-java-9-handwritten-hash-codes-are-faster/

      We should investigate whether it's worth unrolling selected hashCode methods in, e.g., java.lang.String and java.util.Arrays, by hand.

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              • Assignee:
                Unassigned
                Reporter:
                mr Mark Reinhold
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                • Created:
                  Updated:
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