(given an EXT1xx Opcode Allocation). Bear in mind that this option
is **mutually exclusively incompatible** with Vectorisation.
* **group** - the Primary Opcode Group recommended for this instruction.
- Options are EXT0xx (EXT000-EXT063), EXT1xx and EXT2xx. A third area,
+ Options are EXT0xx (EXT000-EXT063), EXT1xx and EXT2xx. A third area
+ (UnVectoriseable),
EXT3xx, was available in an early Draft RFC but has been made "RESERVED"
instead. see [[sv/po9_encoding]].