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  1. JDK
  2. JDK-8274145

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

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    • b19
    • Verified

    Backports

      Description

        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.

        Attachments

          1. 059716.tar.gz
            13 kB
            Aleksey Shipilev

          Issue Links

            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-8275094 C2: condition incorrectly made redundant with dominating main loop exit condition

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8269752 C2: assert(false) failed: Bad graph detected in build_loop_late

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            links to

            Commit Commit openjdk/jdk17u/1a159cad

            Commit Commit openjdk/jdk/2aacd422

            Review Review openjdk/jdk17u/178

            Review Review openjdk/jdk/5712

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                roland Roland Westrelin
                shade Aleksey Shipilev
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                  Created:
                  Updated:
                  Resolved: