Comment 1 for bug 1032203

It chokes on a kernel like this:

define void @test_kernel(i32 addrspace(3)* nocapture %input, i32 addrspace(3)* nocapture %output, [11 x i32]* %_local0) noreturn nounwind uwtable {
entry:
  tail call void @test_arrays_float(i32* getelementptr inbounds ([11 x i32]* @test_kernel.data, i64 0, i64 0), i32 11)
  unreachable
}

opt: /home/visit0r/src/llvm-3.1.src/include/llvm/Support/Casting.h:194: typename llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) [with X = llvm::Constant, Y = llvm::Value*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.

#0 0x00007ffff62a9b9e in __libc_waitpid (pid=<optimized out>, stat_loc=0x7fffffffc030, options=<optimized out>) at ../sysdeps/unix/sysv/linux/waitpid.c:32
#1 0x00007ffff7335b5a in llvm::sys::Program::Wait (this=0x7fffffffc0a0, path=..., secondsToWait=0, ErrMsg=0x7fffffffc160) at Unix/Program.inc:326
#2 0x00007ffff7337417 in llvm::sys::Program::ExecuteAndWait (path=..., args=<optimized out>, envp=0x0, redirects=<optimized out>, secondsToWait=0, memoryLimit=<optimized out>, ErrMsg=0x7fffffffc160) at Program.cpp:35
#3 0x00007ffff7322cf1 in ExecGraphViewer (ErrMsg=<optimized out>, wait=<optimized out>, Filename=<optimized out>, args=<optimized out>, ExecPath=<optimized out>) at GraphWriter.cpp:61
#4 llvm::DisplayGraph (Filename=..., wait=true, program=<optimized out>) at GraphWriter.cpp:196
#5 0x00007ffff678bbef in ViewGraph<llvm::Function const*> (Title=<optimized out>, ShortNames=<optimized out>, Name=<optimized out>, G=<optimized out>, Program=<optimized out>) at /home/visit0r/src/llvm-3.1.src/include/llvm/Support/GraphWriter.h:352
#6 llvm::Function::viewCFG (this=<optimized out>) at CFGPrinter.cpp:146
#7 <function called from gdb>
#8 0x00007ffff55bb1b5 in *__GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#9 0x00007ffff55bdfc0 in *__GI_abort () at abort.c:92
#10 0x00007ffff55b4301 in *__GI___assert_fail (assertion=0x7ffff74ebd50 "isa<X>(Val) && \"cast<Ty>() argument of incompatible type!\"", file=<optimized out>, line=194,
    function=0x7ffff74f5120 "typename llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) [with X = llvm::Constant, Y = llvm::Value*]") at assert.c:81
#11 0x00007ffff6796b7f in llvm::cast<llvm::Constant, llvm::Value*> (Val=<optimized out>) at /home/visit0r/src/llvm-3.1.src/include/llvm/Support/Casting.h:194
#12 0x00007ffff73c77bf in llvm::MapValue (V=0x630758, VM=..., Flags=llvm::RF_NoModuleLevelChanges, TypeMapper=0x0) at ValueMapper.cpp:132
#13 0x00007ffff73c7ecb in llvm::RemapInstruction (I=0x6313b8, VMap=..., Flags=llvm::RF_NoModuleLevelChanges, TypeMapper=0x0) at ValueMapper.cpp:164
#14 0x00007ffff7379639 in llvm::CloneFunctionInto (NewFunc=<optimized out>, OldFunc=<optimized out>, VMap=..., ModuleLevelChanges=<optimized out>, Returns=<optimized out>, NameSuffix=<optimized out>, CodeInfo=0x0, TypeMapper=0x0) at CloneFunction.cpp:148
#15 0x00007ffff5357437 in (anonymous namespace)::GenerateHeader::ProcessAutomaticLocals (this=<optimized out>, F=0x633f90, out=<optimized out>) at GenerateHeader.cc:292
...

The assert happens in llvm::CloneFunctionInto. The curious thing is the first argument to the call which is directly a GEP.