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  1. JDK
  2. JDK-8278296

Generalize long range check transformation

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Details

    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • 18
    • 19
    • hotspot
    • b13

    Description

      A long range check is only transformed into an int range check subject to range check elimination if:

      - the counted loop goes upward
      - the scale factor for the element being accessed is positive

      All combination of:
      (upward loop, downward loop) x (positive scale, negative scale)
      should be supported.

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8296403 [TESTBUG] IR test runner methods in TestLongRangeChecks.java invoke wrong test methods

          • P5 - Cosmetic problem like misspelt words or misaligned text.
          • Resolved

          Enhancement - null JDK-8259609 C2: optimize long range checks in long counted loops

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8283058 Regression ~6% on Renaissance-ScalaKmeans on Windows in b13

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

          Commit Commit openjdk/jdk/ef266d77

          Review Review openjdk/jdk/6989

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              roland Roland Westrelin
              roland Roland Westrelin
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              Dates

                Created:
                Updated:
                Resolved: