x86: Improve implementation of vectorized numberOfLeadingZeros for int and long

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    • Type: Enhancement
    • Resolution: Fixed
    • Priority: P4
    • 26
    • Affects Version/s: 25
    • Component/s: hotspot
    • b24

      Currently, the vectorized assembly for Long.numberOfLeadingZeros does not use the same floating point exponent trick that the integer variant uses, which emits fewer vector operations. Furthermore, the implementation of Integer.numberOfLeadingZeros could be improved to use fewer vector operations, as discussed here: https://github.com/openjdk/jdk/pull/23579#issuecomment-2661332497

            Assignee:
            Jasmine Karthikeyan
            Reporter:
            Jasmine Karthikeyan
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              Created:
              Updated:
              Resolved: