Function svclasta_n_u64 

pub fn svclasta_n_u64(pg: svbool_t, fallback: u64, data: svuint64_t) -> u64

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

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

Conditionally extract element after last Arm’s documentation