* simple (no augmentation)
* Fault-first (where Vector Indexed is banned)
* Data-dependent Fail-First (extremely useful for Linked-List pointer-chasing)
-* Signed Effective Address computation (Vector Indexed only)
+* Signed Effective Address computation (Vector Indexed only, on RB)
More than that however it is necessary to fit the usual Vector ISA
capabilities onto both Power ISA LD/ST with immediate and to LD/ST