[LLVMbugs] [Bug 13981] New: assertion in Polly when invoked via dragonegg on code with variable length arrays

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13981

             Bug #: 13981
           Summary: assertion in Polly when invoked via dragonegg on code
                    with variable length arrays
           Product: dragonegg
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: New Bugs
        AssignedTo: baldrick at free.fr
        ReportedBy: sameer.sahasrabuddhe at amd.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 9279
  --> http://llvm.org/bugs/attachment.cgi?id=9279
example code containing variable length arrays

The attached file contains C99 code extract from the SPEC benchmarks. The code
is fairly generic, and part of the book-keeping done around the benchmarks.
Trying to invoke Polly on this code results in an assertion inside Polly,
specifically when using dragonegg. The crash is related to the presence of a
variable length array inside a function.

There is no crash if a two-step process is followed to first emit IR with
dragonegg and then run Polly using opt. Also there is no crash if clang is used
to invoke Polly directly.

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