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Why not? We call them "compiler". It has nothing to do with Turing's halting theorem, at least mathmatically.
Because the only way to "compile" an x86 app to ARM would be the moral equivalent to embedding an emulator, or unrolling the emulator for every instruction. The problem isn't "making it happen", it's divining higher-level info that isn't there, and is needed to make it fast.
E.g. if you have self-modifying code, you need an emulator by definition. And even without self-modifying code, you still need to identify all function entry points somehow. And differentiate code from data. And then you can't find and fix all function pointers.
If you really try to do this "statically", you devolve into mountains of bookkeeping bullshit that makes it all slower than a JIT emulator.
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