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  1. JDK
  2. JDK-8316587

Use ArraysSupport.vectorizedHashCode in Utf8EntryImpl

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    • Enhancement
    • Resolution: Fixed
    • P4
    • 22
    • None
    • core-libs

    Description

      When inflating Utf8 entries to BYTE state, we can use JavaLangAccess::countPositives and ArraysSupport::vectorizedHashCode to simplify the existing code with the same role.

      In addition, when a String is created from BYTE state Utf8 entry, it can use the ISO_8859_1 encoding to bypass unnecessary checks for the UTF_8 encoding.

      A new benchmark method is added to demonstrate the performance improvement, as the existing ReadMetadata::jdkReadName spends overwhelming majority of its time on Classfile structural parsing. The new benchmark spends about 50% CPU on creating strings from Utf8 entries and can show the effect of this patch more clearly.

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              liach Chen Liang
              liach Chen Liang
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                Updated:
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