[waaveshine]

I’ve noticed a lot of projects use riscv64 as shorthand for the rv64gc ISA, especially when it’s understood that there is an MMU, maybe an FPU, privilege levels, and any other extensions that a modern OS requires.

Anyway, I did find this on the Debian website[1]. So it seems they mean rv64gc.

[1] https://wiki.debian.org/RISC-V#Hardware_baseline_and_ABI_cho...

[photonbeam]

Presumably Android will also chose a base minimum ISA spec for riscv software at some point. It would be tidy if they match the regular linux ecosystem

[snvzz]

Android (and most Linux distributions) is likely to settle for RVA22+V or RVA23 as minimum requirement.

There's a lot in there which RV64GC (ratified in 2019, I understand unchanged since 2017) lacks.

Some of the new extensions e.g. vector and bit manipulation do have a significant effect in performance.

[panick21_]

It has not been decided. There was a talk about the details just 2 weeks ago on the RISC-V International Youtube channel. Very interesting and recommended.