For a comparative data point the VSR Registers may be expressed in the
same fashion. The c code below is directly an expression of Figure 97 in
Power ISA Public v3.1 Book I Section 6.3 page 258, *after compensating for
-MSB0 numbering in both bits abd elements, adapting in full to LSB0 numbering,
+MSB0 numbering in both bits and elements, adapting in full to LSB0 numbering,
and obeying LE ordering*.
**Crucial to understanding why the subtraction from 1,3,7,15 is present