* dsubstep - the destination subvector element offset of the current
parallel instruction being executed
* vfirst - Vertical First mode. srcstep, dststep and substep
- **do not advance** unless explicitly requested to do so with
- pseudo-op svstep (a mode of setvl)
+ **do not advance** unless explicitly requested to do so with svstep
* RMpst - REMAP persistence. REMAP will apply only to the following
instruction unless this bit is set, in which case REMAP "persists".
Reset (cleared) on use of the `setvl` instruction if used to