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  1. JDK
  2. JDK-8274145

C2: condition incorrectly made redundant with dominating main loop exit condition

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        Attached Fuzzer test produces different result in C2:

        $ build/linux-x86_64-server-fastdebug/images/jdk/bin/java -Xint Test | grep instanceCount | tail -n 3
        Test.instanceCount Test.bFld iFld = -13,0,-1965776755
        Test.instanceCount Test.bFld iFld = -13,0,-492785072
        Test.instanceCount Test.bFld iFld = -13,0,1109812339

        $ build/linux-x86_64-server-fastdebug/images/jdk/bin/java -Xcomp -XX:TieredStopAtLevel=1 Test | grep instanceCount | tail -n 3
        Test.instanceCount Test.bFld iFld = -13,0,-1965776755
        Test.instanceCount Test.bFld iFld = -13,0,-492785072
        Test.instanceCount Test.bFld iFld = -13,0,1109812339

        $ build/linux-x86_64-server-fastdebug/images/jdk/bin/java -Xcomp -XX:-TieredCompilation Test | grep instanceCount | tail -n 3
        Test.instanceCount Test.bFld iFld = -13,0,787372637
        Test.instanceCount Test.bFld iFld = -13,0,-1876561976
        Test.instanceCount Test.bFld iFld = -13,0,139528539

        Bisection points to JDK-8269752.

          1. 059716.tar.gz
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              roland Roland Westrelin
              shade Aleksey Shipilev
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                Created:
                Updated:
                Resolved: