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  1. JDK
  2. JDK-8247408

IdealGraph bit check expression canonicalization

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    • b04

    Backports

      Description

        Using TBZ instruction can improve performance in some cases:
          ; org.apache.lucene.analysis.standard.StandardTokenizerImpl::getNextToken (line 917)
          ; if ( (zzAttributes & 1) == 1 ) {
          ;
          0x0000ffffa8ab2658: and w1, w18, #0x1
          0x0000ffffa8ab265c: cmp w1, #0x1
          0x0000ffffa8ab2660: b.ne 0x0000ffffa8ab278c
        =>
          0x0000ffffa8ab2658: tbz w18, #0, 0x0000ffffa8ab278c

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8266716 IdealGraph bit check expression canonicalization

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8248568 compiler/c2/TestBit.java failed "RuntimeException: 'test' missing from stdout/stderr"

            • P3 - Major loss of function.
            • Resolved

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                bulasevich Boris Ulasevich
                bulasevich Boris Ulasevich
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