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  1. JDK
  2. JDK-6747051

Improve code and implicit null check generation for comressed oops

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • hs14
    • hs14
    • hotspot
    • b06
    • sparc
    • solaris_10

    Backports

      Description

        Currently C2 often generats redundant tests against null:

             decode_heap_oop R11,R10
             testl R10, R10 # compressed ptr
             jeq B75 P=0.000001 C=-1.000000

        decode_heap_oop also contains a test of R10 that's not exposed to the optimizer.

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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-2172800 Improve code and implicit null check generation for comressed oops

            • P3 - Major loss of function.
            • Resolved

            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-2177294 Improve code and implicit null check generation for comressed oops

            • P3 - Major loss of function.
            • Closed

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                kvn Vladimir Kozlov
                kvn Vladimir Kozlov
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