[LLVMbugs] [Bug 18642] New: Assertion `L->isLCSSAForm(*DT) && "Indvars did not leave the loop in lcssa form!"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18642

            Bug ID: 18642
           Summary: Assertion `L->isLCSSAForm(*DT) && "Indvars did not
                    leave the loop in lcssa form!"' failed.
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: kcc at google.com
                CC: chandlerc at gmail.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11957
  --> http://llvm.org/bugs/attachment.cgi?id=11957&action=edit
z.cc (full reproducer)

on r200308

% clang -cc1 -O3 -std=gnu++11 z.cc -triple x86_64-unknown-linux-gnu -emit-obj

clang: /home/kcc/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:1882: virtual
bool {anonymous}::IndVarSimplify::runOnLoop(llvm::Loop*, llvm::LPPassManager&):
Assertion `L->isLCSSAForm(*DT) && "Indvars did not leave the loop in lcssa
form!"' failed.

Test case comes from Chromium. Minimized reproducer coming later.

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