[LLVMbugs] [Bug 8042] New: loop unswitch fails to preserve lcssa

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8042

           Summary: loop unswitch fails to preserve lcssa
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu


opt -lcssa -loop-unswitch  aborts on the attached testcase:

Assertion failed: (L->isLCSSAForm(*DT) && "LCSSA form not preserved!"),
function verifyAnalysis, file
/Users/gohman/boot/llvm/lib/Transforms/Utils/LCSSA.cpp, line 82.

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