[balou23]

TBH I still don't really get how it's different from MIPS. As far as I can tell... Loongson seems to be really just MIPS, while LoongArch is MIPS with some extra instructions.

[pantalaimon]

They did get rid of the delay slots and some other MIPS oddities

[bonzini]

LoongArch is, on a first approximation, an almost RISC-V user space instruction set together with MIPS-like privileged instructions and registers.

[mananaysiempre]

Wait, this is a modern-ish ISA with a software-managed TLB, I didn’t realize that! The manual seems a bit unhappy about that part though:

> In the current version of this architecture specification, TLB refill and consistent maintenance between TLB and page tables are still [sic] all led by software.

https://loongson.github.io/LoongArch-Documentation/LoongArch...

[bonzini]

I think they have already added hardware page table walks.

https://lwn.net/Articles/932048/

[mananaysiempre]

But legally distinct! I guess calling it Ｍ○ＰＳ was not enough for plausible deniability.

[genxy]

ISAs shouldn't be patentable in the first place.