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  1. JDK
  2. JDK-8260943

C2 SuperWord: Remove dead vectorization optimization added by 8076284

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    • Enhancement
    • Resolution: Fixed
    • P4
    • 21
    • 17
    • hotspot
    • b24

    Description

      JDK-8251994 changes excluded optimization added by JDK-8076284. It is incomplete and buggy in current state.

      Using unrolling and cloning information to vectorize is interesting idea but as I see it is not complete. Even if pack_parallel() method is able create packs, they are all removed by filter_packs() method. And additionally the cases listed in RFR are vectorized without hoisting loads and pack_parallel - I verified it:
      https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2015-April/017645.html

      This code should be revisited to be useful or removed.

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              epeter Emanuel Peter
              kvn Vladimir Kozlov
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