(termed "preserving Program Order")
* Augments ("tags") existing instructions, providing Vectorisation "context" rather than adding new ones.
* Does not modify or deviate from the underlying scalar OpenPOWER ISA unless it provides significant performance or other advantage to do so in the Vector space (dropping XER.SO and OE=1 for example)
+* Avoids creating significant dependency hazards, allowing high performance
+superscalar microarchitectures to be deployed.
Advantages of these design principles: