Function svdup_n_f64_m 

pub fn svdup_n_f64_m(
    inactive: svfloat64_t,
    pg: svbool_t,
    op: f64,
) -> svfloat64_t

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

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

Broadcast a scalar value Arm’s documentation