compared to a well-designed Cray-style Vector ISA with a `setvl`
instruction.
+*Packed SIMD looped algorithms actually have to
+contain multiple implementations processing fragments of data at
+different SIMD widths: Cray-style Vectors have one, covering not
+just current architectural implementations but future ones with
+wider back-end ALUs as well.*
+
Assuming then that variable-length Vectors are obviously desirable,
it becomes a matter of how, not if. Both Cray and NEC SX Aurora
went the way of adding explicit Vector opcodes, a style which RVV