[LLVMbugs] [Bug 4532] New: llc infloops in FoldingSetImpl::RemoveNode in llc

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4532

           Summary: llc infloops in FoldingSetImpl::RemoveNode in llc
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu


This shows up during "make check" on ARM.

llvm-as < test/CodeGen/2006-11-10-CycleInDAG.ll | llc -march=arm -mattr=+v6
[... wait forever ...]

0x007e5968 in llvm::FoldingSetImpl::RemoveNode ()
(gdb) bt
#0  0x007e5968 in llvm::FoldingSetImpl::RemoveNode ()
#1  0x004dce50 in llvm::SelectionDAG::RemoveNodeFromCSEMaps ()
#2  0x004ddd10 in llvm::SelectionDAG::DeleteNode ()
#3  0x004ba1dc in llvm::SelectionDAG::Combine ()
#4  0x00521d50 in llvm::SelectionDAGISel::CodeGenAndEmitDAG ()
#5  0x0052314c in llvm::SelectionDAGISel::SelectBasicBlock ()
#6  0x00523f78 in llvm::SelectionDAGISel::SelectAllBasicBlocks ()
#7  0x00525224 in llvm::SelectionDAGISel::runOnFunction ()
#8  0x00796f48 in llvm::FPPassManager::runOnFunction ()
#9  0x007971f0 in llvm::FunctionPassManagerImpl::run ()
#10 0x007973f8 in llvm::FunctionPassManager::run ()
#11 0x000d5a04 in main ()

The call to RemoveNode never finishes. This is with a Release-Asserts build,
built with "gcc version 4.3.3 (Debian 4.3.3-10)".


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