`svindex` is a convenience instruction that reduces instruction
count for Indexed REMAP Mode. It sets up
(overwrites) all required SVSHAPE SPRs and can modify the REMAP
-SPR as well.
+SPR as well. The relevant SPRs *may* be directly programmed with
+`mtspr` however it is laborious to do so: svindex saves instructions
+covering much of Indexed REMAP capability.
Form: SVI-Form SV "Indexed" Form (see [[isatables/fields.text]])
Fields:
-* **SVd** - SV REMAP x/y dim
+* **SVd** - SV REMAP x/y dim
* **mask** - sets remap mi0-2/mo0-1 and SVSHAPEs, controlled by mm
* **ew** - sets element width override
* **RS** - GPR RS<<2 to be used for Indexing