Function vsetq_lane_p64 

pub fn vsetq_lane_p64(a: u64, b: poly64x2_t, const LANE: i32) -> poly64x2_t

Available on little-endian and target feature aes and target feature neon and (AArch64 or ARM or ARM64EC) and (AArch64 or ARM64EC) and (AArch64 or ARM64EC or target feature v7) only.

Insert vector element from another vector element Arm’s documentation