Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8285695

Performance regression in C2 loop unrolling

    XMLWordPrintable

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P3
    • Resolution: Not an Issue
    • Affects Version/s: 19
    • Fix Version/s: None
    • Component/s: hotspot
    • Labels:

      Description

      Several changes to code controlling C2's loop unrolling optimizations appear to have caused it to miss many unrolling opportunities at runtime in recent builds. https://github.com/openjdk/jdk/pull/7822 is currently a suspect for causing this performance regression

      Discussion: https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2022-April/054780.html

        Attachments

          Issue Links

            Activity

              People

              Assignee:
              Unassigned Unassigned
              Reporter:
              jwaters Julian Waters
              Votes:
              0 Vote for this issue
              Watchers:
              6 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved: