Background: <https://bugs.libre-soc.org/show_bug.cgi?id=1056#c56>
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+The idea here is to review a modified version of a Power ISA 3
+instruction definition, to add SVP64 in a completely non-disruptive
+fashion.
+
+
+
+# SVP64-annotated addi instruction (prototype)
+
**Add Immediate** D-Form
* addi RT,RA,SI
**Vectorized Add Immediate** SVP64-RM-1S1D/EXTRA3/Normal:D-form
-* sv.addi RT,RA,SI
+* sv.addi RT,RA,SI (Vectorised on *RT and *RA)
```
Prefix: