[LLVMbugs] [Bug 20987] New: Block Frequency Analysis Crashes

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20987

            Bug ID: 20987
           Summary: Block Frequency Analysis Crashes
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: kfischer at college.harvard.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13049
  --> http://llvm.org/bugs/attachment.cgi?id=13049&action=edit
Reproducer

Running the attached bugpoint-simplified bitcode crashes with:

$ opt block-freq-assert.ll -loop-unroll -loop-vectorize
opt:
/home/kfischer/julia-master/deps/llvm-svn/lib/Analysis/BlockFrequencyInfoImpl.cpp:605:
void findIrreducibleHeaders(const llvm::BlockFrequencyInfoImplBase &, const
llvm::bfi_detail::IrreducibleGraph &, const std::vector<const
IrreducibleGraph::IrrNode *> &, LoopData::NodeList &, LoopData::NodeList &):
Assertion `Headers.size() >= 2 && "Should be irreducible"' failed.

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