No need for virtual machines....
Moving from x86 to ARM within a controlled environment like MacOS/OS X can be much simpler than deciding to have to run emulators/jit compilers and the like. Instead, long before the processor architecture swap is put in place, you change the form of the 'binaries' that the computer will accept and install.
And you change that to something equivalent in form and function to the llvm compiler's internal representation. And when you install that binary, you perform the last pass of compilation to whatever processor architecture your computer has installed. And everything runs at native speeds.
This can even be back ported to the appropriate last few OS releases; it will leave those who insist on staying the past somewhat high and dry, though.
Biting the hand that feeds IT
