llvm dev - Mar 2016 - llvm 3.7 and llvm3.1 bitcode compatibility problem

Hi, all

We are using both llvm 3.1 and llvm 3.7 in research. For our purpose, we
need make bitcode generated by 3.7 to be compatible to llvm 3.1's JIT for
interpretation. However, we found they are incompatible. After
disassembling the bitcode (generated by 3.7), we found there are more type
information, comments, and other meta data compared to the bitcode
generated by llvm 3.1.

So, my question is:  how to make llvm3.7 generated bitcode acceptable to
llvm 3.1's JIT ? If we make modifications inside llvm 3.7, how much
engineering effort would it be ? Any advice and comments are welcomed.

Thanks a lot.

Best,
Tao
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