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  1. JDK
  2. JDK-8254872

Optimize Rotate on AArch64

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 16
    • Fix Version/s: 16
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b25
    • CPU:
      aarch64
    • OS:
      generic

      Description

      Intel created a patch to intrinsify Integer/Long.rotateX APIs [1]. New IR nodes are introduced, we can do it in AArch64.
      Considering GVN folds relevant operation patterns into a single Rotate node, the final code[3] removes intrinsics.



      [1] http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-July/038963.html
      [2] https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-July/039048.html
      [3] https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-August/039324.html

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              Assignee:
              eliu Eric Liu
              Reporter:
              qfeng Qi Feng
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                Updated:
                Resolved: