opcode space is required**. Even though they are currently
placed in the EXT022 Sandbox, the "Management" instructions
(setvl, svstep, svremap, svshape, svindex) are designed to fit
-cleanly into EXT019 (like `addpcis`) or other 5/6-bit Minor
-XO area that has space for Rc=1.
+cleanly into EXT019 (exactly like `addpcis`) or other 5/6-bit Minor
+XO area (bits 25-31) that has space for Rc=1.
That said: for the target workloads for which Scalable Vectors are typically
used, the Scalar ISA on which those workloads critically rely