(UnVectoriseable),
EXT3xx, was available in an early Draft RFC but has been made "RESERVED"
instead. see [[sv/po9_encoding]].
+* **Level** - Compliancy Subset and Simple-V Level. `SFFS` indicates "mandatory"
+ in SFFS. All else is "optional" however some instructions are further Subsetted
+ within Simple-V.
* **regs** - a guide to register usage, to how costly Hazard Management
will be, in hardware: