There's IR assembly (the human readable format) and the bitcode format. There are no compatability guarantees for the assembly but new LLVM versions can read th

There's IR assembly (the human readable format) and the bitcode format. There are no compatability guarantees for the assembly but new LLVM versions can read the old bitcode inside the same major version. http://llvm.org/docs/DeveloperPolicy.html#ir-backwards-compatibility http://llvm.org/docs/DeveloperPolicy.html#ir-backwards-compa...