of such is trivial to do for `setb` and `cmp`: the source register type is
a completely different register file from the destination.
Likewise Scalar reduction when the destination is a Vector
-is as if the Reduction Mode was not requested.*
+is as if the Reduction Mode was not requested. However it would clearly
+be unacceptable to perform such optimisations on cache-inhibited LD/ST,
+so some considerable care needs to be taken.*
Typical applications include simple operations such as `ADD r3, r10.v,
r3` where, clearly, r3 is being used to accumulate the addition of all