Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8194740

UseSubwordForMaxVector causes performance regression

    XMLWordPrintable

Details

    • b22

    Backports

      Description

        While investigating JDK-8194659, I've noticed that disabling UseSubwordForMaxVector (which is enabled by default) improves performance.

        The optimization reduces performance of the SPECjvm2008-MPEG benchmark by up to 3.5% and also affects performance of other benchmarks (see JDK-8194659 for details).

        Attachments

          Issue Links

            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8207120 UseSubwordForMaxVector causes performance regression

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8207472 UseSubwordForMaxVector causes performance regression

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8207582 UseSubwordForMaxVector causes performance regression

            • P3 - Major loss of function.
            • Resolved
            duplicates

            Bug - A problem which impairs or prevents the functions of the product. JDK-8194659 SPECjvm2008-MPEG performance regressions in 10-b31

            • P3 - Major loss of function.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8194660 SPECjvm2008-SOR.large regressions in 10-b31 on SPARC

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            relates to

            Enhancement - null JDK-8175096 Analyse subword in the loop to set maximum vector size.

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8209516 DSA generateKeyPair performance regression in jdk11b22 (SPARC)

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed

            Activity

              People

                vdeshpande Vivek Deshpande (Inactive)
                thartmann Tobias Hartmann
                Votes:
                0 Vote for this issue
                Watchers:
                6 Start watching this issue

                Dates

                  Created:
                  Updated:
                  Resolved: