[LLVMbugs] [Bug 5212] New: llc fails an internal assert with debugging symbols and optimization disabled

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5212

           Summary: llc fails an internal assert with debugging symbols and
                    optimization disabled
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: santosh.nagarakatte at gmail.com
                CC: llvmbugs at cs.uiuc.edu, santosh.nagarakatte at gmail.com


Created an attachment (id=3665)
 --> (http://llvm.org/bugs/attachment.cgi?id=3665)
Bugpoint's reduced test case

llc fails with the following assert when compiling spec 2006 benchmark h264
with debugging symbols and optimization turned off.
llc:
/mnt/eclipse/acg/users/santoshn/llvm-2.6/llvm-2.6svn/include/llvm/Analysis/LoopInfo.h:426:
void llvm::LoopBase<N, M>::verifyLoop() conllvm::Loop]: Assertion
`HasInsideLoopSuccs && "Loop block has no in-loop successors!"' failed.


I am trying to compile Spec 2006 benchmark H264 with debugging symbols using
llvm-gcc and llvm-ld.

I compiled each individual file of h264 with the following command line.

llvm-gcc -g -I../../../ -I../../../libutil -c --emit-llvm  -msse2 -DSPEC_CPU
-DNDEBUG -DSPEC_CPU_LP64  <filename>.c -o <filename>.bc

Then I created a single module as follows

llvm-ld -disable-opt <<all .bc files> -o spec2k-h264

Then generated native code as follows

llvm-ld -disable-opt -native -lm spec2k-h264.bc -o h264

I get the following error 

llc:
/mnt/eclipse/acg/users/santoshn/llvm-2.6/llvm-2.6svn/include/llvm/Analysis/LoopInfo.h:426:
void llvm::LoopBase<N, M>::verifyLoop() conllvm::Loop]: Assertion
`HasInsideLoopSuccs && "Loop block has no in-loop successors!"' failed.

I have attached the reduced .bc file produced by bugpoint
The bug can be reproduced by the following command
llc h264-reduced.bc

I am using llvm from the trunk with revision 83867


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