Contrast this with
normal SVP64 `sz=1` behaviour, where *only* a zero is put in
place of masked-out predicate bits.
-* **sz=0** When `sz=0` skipping occurs as usual, but unlike all
+* **sz=0** When `sz=0` skipping occurs as usual on
+ masked-out elements, but unlike all
other SVP64 behaviour which entirely skips an element with
no related side-effects at all, there are certain
special circumstances where CTR