**Notes and Observations**:
* `ternlogi` is like the existing `xxeval` instruction, except operates on GPRs instead
- of VSRs and doesn't require VSX/VMX. SFS and SFFS are comparatively compromised.
+ of VSRs and does not require VSX/VMX. SFS and SFFS are comparatively compromised.
+* SVP64/VSX may have different semantics from SVP64/SFFS. SVP64 orthogonality is compromised
+ by a *non*-Vector-considerate argument that if equivalent instructions are in VSX they
+ do not have to be added to SFFS: they do.
* `crternlogi` is similar to the group of CR Operations (crand, cror etc) which have
been identified as a Binary Lookup Group, except an 8-bit
immediate is used instead of a 4-bit one, and up to 4 bits of a CR Field may