Function svclastb_u64 

pub fn svclastb_u64(
    pg: svbool_t,
    fallback: svuint64_t,
    data: 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.

Conditionally extract last element Arm’s documentation