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  1. JDK
  2. JDK-8325155

C2 SuperWord: remove alignment boundaries

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 24
    • 23, 24
    • hotspot
    • b02

    Description

      SuperWord::memory_alignment
      computes offsets modulo vector_width:
      int off_rem = offset % vw;

      This is an artefact of the old AlignVector mechanism, to avoid packing over alignment boundaries.

      TODO find examples where this made a difference.

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          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. JDK-8330819 C2 SuperWord: bad dominance after pre-loop limit adjustment with base that has CastLL after pre-loop

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8331764 C2 SuperWord: refactor _align_to_ref/_mem_ref_for_main_loop_alignment

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8334431 Regression 18-20% on Mac x64 on Crypto.signverify

          • P2 - Crashes, loss of data, severe memory leak.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. JDK-8333876 C2 SuperWord: regression after JDK-8325155: failed: internal connection

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8334083 C2 SuperWord: TestCompatibleUseDefTypeSize.java fails with -XX:+AlignVector after JDK-8325155

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

          Commit Commit openjdk/jdk/944aeb81

          Review Review openjdk/jdk/18822

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              epeter Emanuel Peter
              epeter Emanuel Peter
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              Dates

                Created:
                Updated:
                Resolved: