Comment by jeremyjh

Traditionally WINE uses QEMU on Apple Silicon to execute x86 binaries on an ARM CPU, so while I’m aware WINE Is No an Emulator there’s likely emulation happening in a lot of cases.

Whenever people bring this up I find it somewhat silly. Wine originally stood for "Windows Emulator". See old release notes ( https://lwn.net/1998/1112/wine981108.html ) for one example: "This is release 981108 of Wine, the MS Windows emulator." The name change was made for trademark and marketing reasons. The maintainers were concerned that if the project got good enough to frighten Microsoft, they might get sued for having "Windows" in the name. They also had to deal with confusion from people such as yourself who thought "emulation" automatically meant "software-based, interpreted emulation" and therefore that running stuff in Wine must have some significant performance penalty. Other Windows compatibility solutions like SoftWindows and Virtual PC used interpreted emulation and were slow as a result, so the Wine maintainers wanted to emphasize that Wine could run software just as quickly as the same computer running Windows.

Emulation does not mean that the CPU must be interpreted. For example, the DOSEMU emulator for Linux from the early 90s ran DOS programs natively using the 386's virtual 8086 mode, and reimplemented the DOS API. This worked similarly to Microsoft's Virtual DOS Machine on Windows NT. For a more recent example, the ShadPS4 PS4 emulator runs the game code natively on your amd64 CPU and reimplements the PS4 API in the emulator source code for graphics/audio/input/etc calls.