Function svextb_u64_x 

pub fn svextb_u64_x(pg: svbool_t, op: svuint64_t) -> svuint64_t

🔬This is a nightly-only experimental API. (stdarch_aarch64_sve #145052)

Available on (AArch64 or ARM64EC) and target feature sve only.

Zero-extend the low 8 bits Arm’s documentation