operands are FPRs, even if the format of the source or destination
data is actually a scalar integer.
+*(This is based on an assumption
+that VSX will be implemented, and VSX is not part of the SFFS Compliancy
+Level. An earlier version of the Power ISA used to have similar instructions:
+they were deprecated due to this incorrect assumption that VSX would
+always be present).*
+
Note that source and destination widths can be overridden by SimpleV
SVP64, and that SVP64 also has Saturation Modes *in addition*
to those independently described here. SVP64 Overrides and Saturation