| base+4 ... base+2 | base | number of bits |
| ------ ----------------- | ---------------- | -------------------------- |
| ..xxxx xxxxxxxxxxxxxxxx | xnnnxxxxx1111111 | (80+16\*nnn)-bit, nnn!=111 |
-| {ops}{Pred}{Reg}{VL Block} | SV Prefix | |
+| {ops}{Pred}{Reg}{VL Block} | VBLOCK Prefix | |
A suitable prefix, which fits the Expanded Instruction-Length encoding
for "(80 + 16 times instruction-length)", as defined in Section 1.5