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  1. JDK
  2. JDK-8159052

AArch64: Optimise unaligned copies in pd_disjoint_words and pd_conjoint_words

    Details

    • Subcomponent:
    • CPU:
      aarch64
    • OS:
      linux

      Description

      The asm vsns of pd_disjoint_words and pd_conjoint_words are not optimised for unaligned accesses.

      Some partners' HW has large penalties for unaligned accesses.

      This issue proposes opimising pd_disjoint_words and pd_conjoint_words for unaligned access.

      Performance on platforms which support unaligned accesses without penalty should not be affected by this change.

        Activity

        Hide
        kvn Vladimir Kozlov added a comment -
        [~enevill] Do you still plan to push it into JDK 9? You need FC exemption request then.
        Show
        kvn Vladimir Kozlov added a comment - [~enevill] Do you still plan to push it into JDK 9? You need FC exemption request then.
        Show
        kvn Vladimir Kozlov added a comment - webrev: http://cr.openjdk.java.net/~enevill/8159052/webrev/
        Hide
        kvn Vladimir Kozlov added a comment -
        Moving to compiler since it will be pushed into hs-comp.
        Show
        kvn Vladimir Kozlov added a comment - Moving to compiler since it will be pushed into hs-comp.
        Hide
        kvn Vladimir Kozlov added a comment -
        Moving this RFE to jdk 10 since there is no FC extension request for jdk 9.

        Show
        kvn Vladimir Kozlov added a comment - Moving this RFE to jdk 10 since there is no FC extension request for jdk 9.
        Hide
        enevill Ed Nevill added a comment -
        This has been pushed the aarch64 jdk8u but not to jdk9

        webrev is here

        http://cr.openjdk.java.net/~enevill/8159052/webrev/

        Last comment on the aarch64 list was

        http://mail.openjdk.java.net/pipermail/aarch64-port-dev/2016-June/003530.html
        Show
        enevill Ed Nevill added a comment - This has been pushed the aarch64 jdk8u but not to jdk9 webrev is here http://cr.openjdk.java.net/~enevill/8159052/webrev/ Last comment on the aarch64 list was http://mail.openjdk.java.net/pipermail/aarch64-port-dev/2016-June/003530.html
        Hide
        zmajo Zoltan Majo (Inactive) added a comment -
        To me it seems that pd_disjoint_words and pd_conjoint_words have a large set of users (not just the compiler or compiler-related components). Therefore it is most likely better to address this issue within the runtime (and not compiler).
        Show
        zmajo Zoltan Majo (Inactive) added a comment - To me it seems that pd_disjoint_words and pd_conjoint_words have a large set of users (not just the compiler or compiler-related components). Therefore it is most likely better to address this issue within the runtime (and not compiler).
        Hide
        gtriantafill George Triantafillou added a comment -
        Is this change going to be completed for jdk 10?
        Show
        gtriantafill George Triantafillou added a comment - Is this change going to be completed for jdk 10?

          People

          • Assignee:
            aph Andrew Haley
            Reporter:
            enevill Ed Nevill
          • Votes:
            0 Vote for this issue
            Watchers:
            6 Start watching this issue

            Dates

            • Created:
              Updated: