SVE or RVV. At the same time it is also "old" because it is a generalisation
of the Z80
[Block compare](https://rvbelzen.tripod.com/z80prgtemp/z80prg04.htm)
-instructions, especially
- It is extremely useful for reducing instruction count,
+instructions, especially
+[CPIR](http://z80-heaven.wikidot.com/instructions-set:cpir)
+which is based on CP (compare) as the ultimate "element" (suffix)
+operation to which the repeat (prefix) is applied.
+It is extremely useful for reducing instruction count,
however requires speculative execution involving modifications of VL
to get high performance implementations. An additional mode (RC1=1)
effectively turns what would otherwise be an arithmetic operation