Also used on [[sv/mv.swizzle]]
-MVRM-2P-1S1D:
-
-| Field Name | Field bits | Description |
-|------------|------------|----------------------------|
-| Rdest_EXTRA2 | `10:11` | extends Rdest (R\*\_EXTRA2 Encoding) |
-| Rsrc_EXTRA2 | `12:13` | extends Rsrc (R\*\_EXTRA2 Encoding) |
-| PACK_en | `14` | Enable pack |
-| UNPACK_en | `15` | Enable unpack |
-| MASK_SRC | `16:18` | Execution Mask for Source |
+`RM-2P-1S1D-PU` Mode is applicable to all mv operations
+(fmv etc) and to Indexed LD/ST.
The usual RM-2P-1S1D is reduced from EXTRA3 to EXTRA2, making
room for 2 extra bits that enable either "packing" or "unpacking"