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  1. JDK
  2. JDK-8186203

Consider unrolling selected hashCode loops

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    • Enhancement
    • Resolution: Duplicate
    • P3
    • None
    • None
    • hotspot
    • generic
    • 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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          duplicates

          Enhancement - null JDK-8059113 Optimize polynomial hash loops

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

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              Unassigned Unassigned
              mr Mark Reinhold
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