* (20): Like the original Cray RVV is a truly scalable Vector ISA (Cray setvl instruction). However, like SVE2, the Maximum Vector length is a Silicon-partner choice, which creates similar limitations that SVP64 does not have.
The RISC-V Founders strongly discouraged efforts by programmers to find out the Maximum Vector Length, as an effort to steer programmers towards Silicon-independent assembler. This requires all algorithms to contain a loop construct.
MAXVL in SVP64 is a Spec-hard-fixed quantity therefore loop constructs are not necessary 100% of the time.
-* (21): like SVP64 it is up to the hardware implementor to choose whether to support 128-bit elements.
+* (21): like SVP64 it is up to the hardware implementor (Silicon partner) to choose whether to support 128-bit elements.
* (22): [NEC SX Aurora](https://ftp.libre-soc.org/NEC_SX_Aurora_TSUBASA_VectorEngine-as-manual-v1.2.pdf) is based on the original Cray Vectors
* (23): [Aurora ISA guide](https://sxauroratsubasa.sakura.ne.jp/documents/guide/pdfs/Aurora_ISA_guide.pdf) Appendix-3 11.1 p508
* (24): Like the original Cray Vectors, the ISA Vector Length is independent of the underlying hardware, however Generation 1 has 256 elements per Vector register (3.2.4 p24, Aurora ISA guide)