[LLVMbugs] [Bug 877] NEW: core dump by -condprop optimization pass

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=877

           Summary: core dump by -condprop optimization pass
           Product: tools
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: opt
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: pjenkins at apple.com
                CC: pjenkins at apple.com


Running `opt bugpoint-reduced-condprop.8-11-2006.bc -condprop` produces the
following output: 
WARNING: You're attempting to print out a bytecode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bytecode first-hand, you
can force output with the `-f' option.

PHINode should have one entry for each predecessor of its parent basic block!
        %tmp.i119.lcssa35.lcssa.lcssa.lcssa.lcssa.lcssa = phi
"struct.kc::impl_elem_patternrepresentation"* [ null, %bb1077 ]           ;
<"struct.kc::impl_elem_patternrepresentation"*> [#uses=0]
Broken module found, compilation aborted!
Abort trap

The bytecode file can be found at: 
http://www.patjenk.com/llvm/bugpoint-reduced-condprop.8-11-2006.bc


This error first occurred on a dual g5 running a beta version of mac os 10.5 and
was reproduced on a g4 running mac os 10.4.6. I was using the latest llvm CVS on
both machines. 

The bug was exposed by running the following passes through bugpoint on kimwitu++: 
-simplifycfg -instcombine -loopsimplify -instcombine -inline -sccp -lowersetjmp
-reassociate -adce -scalarrepl -loop-unswitch -condprop -mergereturn
-raiseallocs -dse -instcombine -tailcallelim -funcresolve -lcssa -mem2reg
-constmerge -simplifycfg -condprop -prune-eh -simplifycfg -argpromotion -basiccg
-globalopt -simplifycfg -verify -licm -instcombine -raise -verify -simplifycfg
-deadtypeelim -gcse -basiccg -break-crit-edges -loop-unroll -tailduplicate
-ipconstprop -deadargelim -simplify-libcalls -globaldce -instcombine -load-vn
-break-crit-edges -indvars



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