Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8155612

Aarch64: vector nodes need to support misaligned offset

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b120
    • CPU:
      aarch64

      Description

      When the superword optimization encounters a misaligned offset, it tries to align the loop induction variable so the memory access is aligned. So even though the aarch64 port only supports align vector memory accesses ( Matcher::misaligned_vectors_ok() return false), vector node can still get a misaligned offset which results in:

      # Internal Error (/scratch/rwestrel/hs-comp/hotspot/src/cpu/aarch64/vm/assembler_aarch64.hpp:251), pid=3780, tid=3807
      # guarantee(chk == -1 || chk == 0) failed: Field too big for insn

        Issue Links

          Activity

          Hide
          hgupdate HG Updates added a comment -
          URL: http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/9e21d8c18a7d
          User: zmajo
          Date: 2016-04-28 14:38:23 +0000
          Show
          hgupdate HG Updates added a comment - URL: http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/9e21d8c18a7d User: zmajo Date: 2016-04-28 14:38:23 +0000
          Hide
          hgupdate HG Updates added a comment -
          URL: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/9e21d8c18a7d
          User: lana
          Date: 2016-05-25 17:36:48 +0000
          Show
          hgupdate HG Updates added a comment - URL: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/9e21d8c18a7d User: lana Date: 2016-05-25 17:36:48 +0000

            People

            • Assignee:
              roland Roland Westrelin
              Reporter:
              roland Roland Westrelin
            • Votes:
              0 Vote for this issue
              Watchers:
              2 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: