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  1. JDK
  2. JDK-8236641

Improve Set.of(...).iterator() warmup characteristics

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 15
    • None
    • core-libs

    Description

      The iterators for ImmutableCollections.SetN and Set12 can be improved to improve startup and warmup characteristics. This has measurable impact on JVM bootstrap time, since iteration over SetN/Set12s are done intensively during module bootstrap.

      Possible improvements include:

      SetNIterator: move while loop to a leaf method to reduce method calls, while hoisting the SALT test from the loop
      Set12: move SALT branch to iterator constructor, which makes the next() method smaller, faster and with fewer branches

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            redestad Claes Redestad
            redestad Claes Redestad
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              Created:
              Updated:
              Resolved: