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  1. JDK
  2. JDK-8303827

C2 SuperWord: allow more fine grained alignment for +AlignVector

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    • Enhancement
    • Resolution: Duplicate
    • P4
    • tbd
    • 21
    • hotspot

    Description

      Platforms with alignment requirement do not need to have alignment modulo vector_width, that is too restrictive. It prevents vectorization of some simple conversion tests. Platforms often only require 4-byte or 8-byte alignment.

      This is more relevant after JDK-8298935 (where we disable "resurrecting" rejected memops). This prevents certain conversion-tests to fail under +AlignVector. For example some tests in TestVectorizeTypeConversion.java.

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          duplicates

          Bug - A problem which impairs or prevents the functions of the product. JDK-8310190 C2 SuperWord: AlignVector is broken, generates misaligned packs

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8298935 fix independence bug in create_pack logic in SuperWord::find_adjacent_refs

          • P3 - Major loss of function.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8305055 IR check fails on some aarch64 platforms

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8310190 C2 SuperWord: AlignVector is broken, generates misaligned packs

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

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              epeter Emanuel Peter
              epeter Emanuel Peter
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                Created:
                Updated:
                Resolved: