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  1. JDK
  2. JDK-8261147

C2: Node is wrongly marked as reduction resulting in a wrong execution due to wrong vector instructions

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    • b64
    • 9
    • b31
    • Verified

    Backports

      Description

        This is just a generic synopsis. Please change accordingly.

        The attached fuzzer test produces a different result for C2 compared to C1/interpreter. It starts to fail after JDK-8235673. However, this change only reveals an existing problem by changing the inline decision of the test. By additionally setting -XX:MaxInlineSize=37, the bug can actually be traced back to JDK-8240248.

        To reproduce:
        $ java -Xint Test.java > xint.log
        $ java -Xcomp -XX:CompileOnly=Test Test.java > c2.log

        $ diff xint.log c2.log
        62c62
        < vMeth1_check_sum: -4505034666541838094
        ---
        > vMeth1_check_sum: 8100660520553448565
        71c71
        < vMeth1_check_sum: 121887261065963647
        ---
        > vMeth1_check_sum: 6886533561546985349
        80c80
        < vMeth1_check_sum: 4748809188657399033
        ---
        > vMeth1_check_sum: 5672397492800002690
        89c89
        < vMeth1_check_sum: -9071012959872778812
        ---
        > vMeth1_check_sum: 4458264447119787987


        Attachments

          1. FuzzerUtils.java
            13 kB
          2. Reduced.java
            0.7 kB
          3. Test.java
            7 kB

          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-8270225 C2: Node is wrongly marked as reduction resulting in a wrong execution due to wrong vector instructions

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8270744 C2: Node is wrongly marked as reduction resulting in a wrong execution due to wrong vector instructions

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8271383 C2: Node is wrongly marked as reduction resulting in a wrong execution due to wrong vector instructions

            • P2 - Crashes, loss of data, severe memory leak.
            • 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-8270545 C2: Node is wrongly marked as reduction resulting in a wrong execution due to wrong vector instructions

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

            Enhancement - null JDK-8074981 Integer/FP scalar reduction optimization

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8279622 C2: miscompilation of map pattern as a vector reduction

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-8240248 Extend superword reduction optimizations for x86

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

            Enhancement - null JDK-8287087 C2: perform SLP reduction analysis on-demand

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

            Commit Commit openjdk/jdk11u-dev/69341be4

            Commit Commit openjdk/jdk17/f791fdf2

            Review Review openjdk/jdk11u-dev/164

            Review Review openjdk/jdk17/231

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                chagedorn Christian Hagedorn
                chagedorn Christian Hagedorn
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                  Created:
                  Updated:
                  Resolved: