This latter would be useful in the Vector context to have an alternative meaning: as the bit which determines whether the instruction is 11-bit prefixed or 27-bit prefixed:
-'''
-0 1 2 3 4 5 6 7 8 9 a b c d e f |
-|major op | 11 bit vector prefix|
-|16 bit opcode alt vec. mode ^ |
-| extra vector prefix if alt set|
-'''
+ 0 1 2 3 4 5 6 7 8 9 a b c d e f |
+ |major op | 11 bit vector prefix|
+ |16 bit opcode alt vec. mode ^ |
+ | extra vector prefix if alt set|
+