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  1. JDK
  2. JDK-8254872

Optimize Rotate on AArch64

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 16
    • 16
    • hotspot
    • b25
    • aarch64
    • 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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          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8256478 C2 compilation fails with assert(t1->isa_long()) failed: Type must be a long

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

          Enhancement - null JDK-8256438 AArch64: Implement match rules with ROR shift register value

          • 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-8256823 C2 compilation fails with "assert(isShiftCount(imm8 >> 1)) failed: illegal shift count"

          • P2 - Crashes, loss of data, severe memory leak.
          • Closed
          links to

          Commit Commit openjdk/jdk/30a2ad55

          Review Review openjdk/jdk/1199

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              eliu Eric Liu
              qfeng Qi Feng
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                Created:
                Updated:
                Resolved: