| Value | Mnemonic | Description |
|-------|-------------------|--------------------------------------------------------|
| 0000 | - | Reserved (causes an illegal instruction trap) |
-| 0001 | ALWAYS (implicit) | Operation is not masked |
+| 0001 | ALWAYS (implicit) | Operation is not masked see [[discussion]] |
| 0010 | R3 | Element `i` is enabled if `R3 & (1 << i)` is non-zero |
| 0011 | ~R3 | Element `i` is enabled if `R3 & (1 << i)` is zero |
| 0100 | R10 | Element `i` is enabled if `R10 & (1 << i)` is non-zero |