Yes, indeed, I should have stated "cannot execute unaligned instructions". Or have said 8 bit instead, then it would be immediately obvious what I mean. (You ca

Yes, indeed, I should have stated "cannot execute unaligned instructions". Or have said 8 bit instead, then it would be immediately obvious what I mean. (You cannot jump into the middle of a byte because you cannot even address it.) But I wanted to show how Rice's Theorem does not generally apply here. You can make up other examples: A register that needs an instruction with a length of 1000 bytes, yet the ROM only has 512 bytes space etc... As for JIT, also correct (hence my condition), though that's also a property of the OS and not just the M1 (and on iOS for example, it is far more restricted what code is allowed to do JIT, as was stated in the thread already).