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  1. JDK
  2. JDK-8155612

Aarch64: vector nodes need to support misaligned offset

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    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

      Backports

        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

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                Assignee:
                roland Roland Westrelin
                Reporter:
                roland Roland Westrelin
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                  Created:
                  Updated:
                  Resolved: