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  1. JDK
  2. JDK-8187472

AARCH64: array_equals intrinsic doesn't use prefetch for large arrays

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Details

    • Enhancement
    • Resolution: Fixed
    • P3
    • 11
    • 10
    • hotspot
    • b10
    • aarch64
    • linux

    Description

      Current array_equals implementation doesn't used prefetch instruction(prfm) in case of large arrays. It can significantly improve performance in case of large and equal arrays(or arrays which are different at the end).

      Attachments

        1. ar_eq_T88.txt
          2 kB
        2. array_eq_1.0.diff
          3 kB
        3. array_eq_2.0.diff
          2 kB
        4. array_eq_2.1.diff
          3 kB
        5. array_eq_2.2.diff
          3 kB
        6. array_eq_2.3.diff
          4 kB
        7. array_eq_2.5.diff
          4 kB
        8. array_eq_2.6.1.diff
          7 kB
        9. array_eq_2.6.2.diff
          7 kB
        10. array_eq_2.6.diff
          7 kB
        11. array_eq_2.6d_newws.diff
          8 kB
        12. array_eq_2.6d.diff
          8 kB
        13. array_eq_2.7.diff
          7 kB
        14. array_eq_2.8.diff
          6 kB
        15. array_eq_2.9.1.diff
          6 kB
        16. array_eq_2.9.2.diff
          6 kB
        17. array_eq_2.9.diff
          6 kB
        18. array_eq_3.0.diff
          4 kB
        19. array_eq_4.0.diff
          5 kB
        20. array_eq_5.0.diff
          5 kB
        21. array_eq_6.0_mixed.diff
          5 kB
        22. array_eq_7.0.diff
          5 kB
        23. array_eq_8.0.diff
          4 kB
        24. array_eq_9.0.diff
          5 kB
        25. array_equals_results.txt
          1 kB
        26. array_equals.ods
          13 kB
        27. array_equals.ods
          13 kB
        28. ArrayEqualsBench.java
          2 kB
        29. ArrayEqualsBench.java
          2 kB
        30. test.java
          1 kB
        31. test.java
          1 kB
        32. test.java
          1 kB

        Issue Links

          blocks

          JEP - Java Enhancement Proposal JDK-8189104 JEP 315: Improve Aarch64 Intrinsics

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8307572 AArch64: Vector registers are clobbered by some macroassemblers

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

          JEP - Java Enhancement Proposal JDK-8189100 Improve performance of String and Array operations on AArch64

          • P3 - Major loss of function.
          • Closed

          Activity

            People

              dpochepk Dmitrij Pochepko
              dpochepk Dmitrij Pochepko
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              Dates

                Created:
                Updated:
                Resolved: