There's another big one, 4K page support. The MMU can be told to set up a virtual address space with smaller, x86-compatible 4096-byte memory pages instead of the default 16384-byte pages.

Those are still needed for the Rosetta use-cases that are sticking around (old games, Linux binaries)

> There are only a handful of different instructions that account for 90% of all operations executed, and, near the top of that list are addition and subtraction. On ARM these can optionally set the four-bit NZCV register, whereas on x86 these always set six flag bits: CF, ZF, SF and OF (which correspond well-enough to NZCV), as well as PF (the parity flag) and AF (the adjust flag).

> Emulating the last two in software is possible (and seems to be supported by Rosetta 2 for Linux), but can be rather expensive. Most software won’t notice if you get these wrong, but some software will. The Apple M1 has an undocumented extension that, when enabled, ensures instructions like ADDS, SUBS and CMP compute PF and AF and store them as bits 26 and 27 of NZCV respectively, providing accurate emulation with no performance penalty.

https://dougallj.wordpress.com/2022/11/09/why-is-rosetta-2-f...