is `UNDEFINED` behaviour.
* An **entire** Vector is held up on Horizontal-First Mode if the
Integer Predicate is still in in-flight Reservation Stations
- or pipelines. Only Speculative Vector Chaining mitigates delays
- but can be wasteful of resources.
+ or pipelines. Speculative Vector Chained Execution mitigates delays
+ but can be heavy on Reservation Station resources.
## Register files, elements, and Element-width Overrides