[amarioguy]

Project developer here, Windows actually has a x64 compatibility layer now for ARM64 systems in general, so any ARM64 Windows device should be able to run x64 apps (granted the performance penalty is worse than Rosetta since Rosetta relies on Apple SoCs actually implementing small slices of x86 (memory ordering model for instance) which isn't true for any Qualcomm SoC at the moment.)

The problem with x64 on arm64 is no longer if it's possible, but rather the performance penalty. As for whether I'll try to make a Rosetta-like compat layer using the hardware optimizations: not sure yet, I have bigger fish to fry before I get there.

[mappu]

It turns out Rosetta2 does not rely on special M1 hardware memory ordering at all:

https://twitter.com/never_released/status/153412764108259328...

https://twitter.com/marcan42/status/1534032369166225409

The baseline for translation is qemu-user, but other pure-software emulators like FEX-emu and Box86/Box64 can perform this translation significantly faster. So I think there's just ordinary performance engineering to close the gap.

[saagarjha]

Yes it does, you’re misunderstanding the tweets. You need TSO to emulate x86-64 correctly.