are you using the ARM or THUMB llvm backend?
If you are using the THUMB backend then you are probably hitting LLVM PR 6223 http://llvm.org/bugs/show_bug.cgi?id=6223
If you are using the ARM backend and have enabled -mattr=+neon then you are probably hitting LLVM PR 6561 http://llvm.org/bugs/show_bug.cgi?id=6561
in both cases you hit the unreachanble because the llvm jit cant jit thumb/neon instructions.
are you using the ARM or THUMB llvm backend?
If you are using the THUMB backend then you are probably hitting LLVM PR 6223 llvm.org/ bugs/show_ bug.cgi? id=6223
http://
If you are using the ARM backend and have enabled -mattr=+neon then you are probably hitting LLVM PR 6561 llvm.org/ bugs/show_ bug.cgi? id=6561
http://
in both cases you hit the unreachanble because the llvm jit cant jit thumb/neon instructions.