currently named "SVP64-Single" [^likeext001]
* A third 24-bits (third 2-bit XO) is strongly recommended to be **reserved**
such that future unforeseen capability is needed.
-* To hold all Vector Context, five SPRs are needed for userspace
- (MSR.PR=1 Problem State). If Supervisor and Hypervisor mode are to
+* To hold all Vector Context, five SPRs are needed for userspace.
+ If Supervisor and Hypervisor mode are to
also support Simple-V they will correspondingly need five SPRs each.
* Five 6-bit XO (A-Form) "Management" instructions are needed. These are
Scalar 32-bit instructions and *may* be 64-bit-extended in future