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  1. JDK
  2. JDK-8362171

C2 fails with unexpected node in SuperWord truncation: ModI

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    • b07

        After JDK-8350177, we hit the following assert in C2:

        java -XX:CompileCommand=quiet -XX:CompileCommand=compileonly,*Test*::* -XX:-TieredCompilation -Xbatch Test.java

        #
        # A fatal error has been detected by the Java Runtime Environment:
        #
        # Internal Error (workspace/open/src/hotspot/share/opto/superword.cpp:2605), pid=327591, tid=327611
        # assert(false) failed: Unexpected node in SuperWord truncation: ModI
        #
        # JRE version: Java(TM) SE Runtime Environment (26.0+7) (fastdebug build 26-ea+7-633)
        # Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 26-ea+7-633, mixed mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
        # Problematic frame:
        # V [libjvm.so+0x1aa4154] VLoopTypes::compute_vector_element_type()+0xcc4

        Current CompileTask:
        C2:2960 128 b Test::mainTest (858 bytes)

        Stack: [0x000070ca8b500000,0x000070ca8b600000], sp=0x000070ca8b5fa670, free space=1001k
        Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
        V [libjvm.so+0x1aa4154] VLoopTypes::compute_vector_element_type()+0xcc4 (superword.cpp:2605)
        V [libjvm.so+0x1bd0901] VLoopAnalyzer::setup_submodules_helper()+0x91
        V [libjvm.so+0x1bd0974] VLoopAnalyzer::setup_submodules()+0x44
        V [libjvm.so+0x15738c5] PhaseIdealLoop::auto_vectorize(IdealLoopTree*, VSharedData&)+0x8e5
        V [libjvm.so+0x1551b8d] PhaseIdealLoop::build_and_optimize()+0xfdd
        V [libjvm.so+0xb58043] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x4f3
        V [libjvm.so+0xb4f306] Compile::optimize_loops(PhaseIterGVN&, LoopOptsMode)+0xb6
        V [libjvm.so+0xb52071] Compile::Optimize()+0xcc1
        V [libjvm.so+0xb5532f] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1f9f
        V [libjvm.so+0x97a437] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x467
        V [libjvm.so+0xb64698] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xb58
        V [libjvm.so+0xb65868] CompileBroker::compiler_thread_loop()+0x578
        V [libjvm.so+0x10bc88b] JavaThread::thread_main_inner()+0x13b
        V [libjvm.so+0x1b2eb26] Thread::call_run()+0xb6
        V [libjvm.so+0x179e698] thread_native_entry(Thread*)+0x128

          1. FuzzerUtils.java
            13 kB
          2. Test.java
            10 kB
          3. TestSimple.java
            0.3 kB

              jkarthikeyan Jasmine Karthikeyan
              thartmann Tobias Hartmann
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                Created:
                Updated:
                Resolved: