[LLVMbugs] [Bug 1752] New: LoopSimplifier dies on crazy code

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1752

           Summary: LoopSimplifier dies on crazy code
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Loop Optimizer
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1174)
 --> (http://llvm.org/bugs/attachment.cgi?id=1174)
Bytecode in question

Consider attached bytecode.

Running either 'opt -loopsimplify' or just 'llc' results:

opt: /home/asl/proj/llvm/src/lib/VMCore/Value.cpp:57: virtual
llvm::Value::~Value(): Assertion `use_empty() && "Uses remain when a value is
destroyed!"' failed.
./opt((anonymous namespace)::PrintStackTrace()+0x22)[0x86c1910]
./opt((anonymous namespace)::SignalHandler(int)+0x102)[0x86c1bb8]
[0xffffe420]
/lib/libc.so.6(abort+0xec)[0xb7c8ef9c]
/lib/libc.so.6(__assert_fail+0xde)[0xb7c86b5e]
./opt(llvm::Value::~Value()+0x156)[0x86741da]
./opt(llvm::User::~User()+0x1a)[0x85fc700]
./opt(llvm::Instruction::~Instruction()+0x47)[0x8634fe5]
./opt(llvm::TerminatorInst::~TerminatorInst()+0x1a)[0x863600e]
./opt(llvm::InvokeInst::~InvokeInst()+0x80)[0x8637b50]
./opt(llvm::iplist<llvm::Instruction, llvm::ilist_traits<llvm::Instruction>
>::erase(llvm::ilist_iterator<llvm::Instruction>)+0x33)[0x83ede4b]
./opt(llvm::iplist<llvm::Instruction, llvm::ilist_traits<llvm::Instruction>
>::pop_back()+0x74)[0x842db36]
./opt((anonymous
namespace)::LoopSimplify::runOnFunction(llvm::Function&)+0x221)[0x85343b5]
./opt(llvm::FPPassManager::runOnFunction(llvm::Function&)+0x13d)[0x8656567]
./opt(llvm::FPPassManager::runOnModule(llvm::Module&)+0x76)[0x86566fe]
./opt(llvm::MPPassManager::runOnModule(llvm::Module&)+0x123)[0x8656859]
./opt(llvm::PassManagerImpl::run(llvm::Module&)+0x86)[0x8656c12]
./opt(llvm::PassManager::run(llvm::Module&)+0x1a)[0x8656d7e]
./opt(main+0xbd3)[0x83e1e8b]
/lib/libc.so.6(__libc_start_main+0xe6)[0xb7c799d6]
./opt(realloc+0x75)[0x83d4ba1]


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