Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8277426

Optimize mask reduction operations on x86

    XMLWordPrintable

Details

    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • 18
    • 18
    • hotspot
    • b26
    • 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.

      Attachments

        Issue Links

          Activity

            People

              sviswanathan Sandhya Viswanathan
              sviswanathan Sandhya Viswanathan
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: