Converting LLVM IR bitcode binary to different arch/sub arch

Hi,

Is it possible to convert a bitcode file with same target (Ex. ARM) with sub arch (armv7 or armv7s) into another bitcode or native code format(Ex. ARM with armv8 or arm64) ?

I am also assuming that one Arch(ARM) to another Arch(X86) conversion not possible.(correct me if I am wrong)

This question is related to Apple’s new bitcode binaries. I am trying to understand, how Apple is going to generate native code from bit code binaries for future devices or archs as bitcode is target-arch dependent. Can they able convert if the new device has new Arch or new sub arch ?

@Greg, any Information would be really helpful.

Thanks,
Sridhar