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I guess Rosetta can’t handle anything that jits.

Edit: this is totally wrong. see thread.

It has been reported that Julia runs just fine under Rosetta.

Wow that’s pretty cool. I also found https://developer.apple.com/documentation/apple_silicon/abou... which explicitly says Rosetta can handle jit. I wonder how it does that? It must emulate the jitted x86 instructions...

Edit: apparently it translates instructions when they are marked executable (based on speculation on HN)

Ahead of time translation is merely an optimisation trick. It still is an emulator.

Is this really true? I thought Rosetta translated x86 to arm

Tried looking for docs but didn’t find anything decisive either way

Yeah, I think better question is what's the performance penalty of JIT on Rosetta 2.