Which of RV64GBCV, RV64GCBV, and RV64GCVB is legal?

[songdongsheng]

Hi, I've seen vendors say that RV64GBCV, RV64GCBV, and RV64GCVB are all used when implementing the B and V extensions in the specification. Which of RV64GBCV, RV64GCBV, and RV64GCVB is legal according to the RISC-V specification?

[kito-cheng]

According the table in the spec[1], rv64gcbv is the (more?) canonical one.

[1] https://github.com/riscv/riscv-isa-manual/blob/main/src/naming.adoc#subset-naming-convention