* **CTR-test=0, CTi=0**: CTR decrements on a per-element basis
if `BO[2]` is zero. Masked-out elements when `sz=0` are
skipped (i.e. CTR is *not* decremented when the predicate
- bit is zero).
+ bit is zero and `sz=0`).
* **CTR-test=0, CTi=1**: CTR decrements on a per-element basis
if `BO[2]` is zero and a masked-out element is skipped
(`sz=0` and predicate bit is zero). This one special case is the