Vectorisation of the VSX Packed SIMD system makes no sense whatsoever,
the sole exceptions potentially being any operations with 128-bit
-operands.
-SV effectively *replaces* VSX and provides,
+operands such as `vrlq` (Rotate Quad Word).
+SV effectively *replaces* VSX requiring far less instructions, and provides,
at the very minimum, predication (which VSX was designed without).
Thus all VSX Major Opcodes - all of them - are "unused" and must raise
illegal instruction exceptions in SV Prefix Mode.