The SVP64 prefix always comes before the suffix in PC order and must be
considered an independent "Defined word" that augments the behaviour of
the following instruction, but does **not** change the actual Decoding
-of that following instruction. **All prefixed instructions retain their
-non-prefixed encoding and definition**.
+of that following instruction. **All prefixed 32-bit instructions
+(Defined Words) retain their non-prefixed encoding and definition**.
Two apparent exceptions to the above hard rule exist: SV Branch-Conditional
operations and LD/ST-update "Post-Increment" Mode. Post-Increment
was considered sufficiently high priority (significantly reducing hot-loop
-instruction count) that one bit in the Prefix is reserved for it.
+instruction count) that one bit in the Prefix is reserved for it
+(Note the intention to release that bit and move Post-Increment instructions
+to EXT2xx).
Vectorised Branch-Conditional operations "embed" the original Scalar
Branch-Conditional behaviour into a much more advanced variant that
is highly suited to High-Performance Computation (HPC), Supercomputing,