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  1. JDK
  2. JDK-8277426

Optimize mask reduction operations on x86

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 18
    • Fix Version/s: 18
    • Component/s: hotspot
    • Subcomponent:
    • Resolved In Build:
      b26
    • CPU:
      x86

      Description

      Optimize vector mask reduction operations (firsttrue, lasttrue, tolong, truecount) on x86:
         * Use vmovmskpd, vmovmskps instead of full VectorStoreMask to boolean prior to the mask reduction where possible.
         * Use lzcnt/tzcnt for lasttrue/firsttrue.

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              Assignee:
              sviswanathan Sandhya Viswanathan
              Reporter:
              sviswanathan Sandhya Viswanathan
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                Updated:
                Resolved: