lookups are mentioned for completeness but not included as part
of this RFC. Another Stakeholder with a vested interest in 64-bit
Prefixed instructions may wish to consider submitting them.
-4. `fishmv` as a Read-Modify-Write saves five potential bits, making
- the difference between a VA/DX-Form and requiring an entire Major
- Opcode.
+4. `fishmv` as a FRS-only Read-Modify-Write (instead of an unnecessary
+ FRS,FRA pair) saves five potential bits, making
+ the difference between a 5-bit XO (VA/DX-Form) and requiring an entire
+ Primary Opcode.
**Changes**