|--------|--------------|--------------|
| EXT01 | v3.1B Prefix | v3.1B Suffix |
-svp64 fits into the "reserved" portions of the v3.1B prefix, making it oissible for svp64, v3.0B and v3.1B instructions to co-exist in the sane binary without conflict.
+svp64 fits into the "reserved" portions of the v3.1B prefix, making it possible for svp64, v3.0B (or v3.1B instructions including 64 bit prefixed) to co-exist in the same binary without conflict.
# Definition of Reserved in this spec.