When Rc=1 the CR element however is still stored in the CR regfile, even if the test failed. See appendix for details.
* **Pack/Unpack** mode, only available when SUBVL is vec2/3/4, performs
basic structure packing on sub-elements. Bits 4-5 (normally elwidth) are
-taken up as Pack/Unpack bits.
+taken up as Pack/Unpack bits. Saturation may be simultaneously enabled.
Note that ffirst and reduce modes are not anticipated to be high-performance in some implementations. ffirst due to interactions with VL, and reduce due to it requiring additional operations to produce a result. normal, saturate and pred-result are however inter-element independent and may easily be parallelised to give high performance, regardless of the value of VL.