Zvl128b Extension

The Zvl128b extension requires the implementation to have a vector register length (VLEN) of at least 128 bits.

The Zvl*b extensions are a family of extensions that specify minimum vector register lengths. They allow software to determine the minimum VLEN supported by an implementation without needing to probe at runtime.

VLEN=128 is the minimum vector register length required by the full V extension. With VLEN=128 and SEW=8 bits, VLMAX is 16 elements (with LMUL=1).