Function vsetq_lane_s64 

pub fn vsetq_lane_s64(a: i64, b: int64x2_t, const LANE: i32) -> int64x2_t

Available on (AArch64 or ARM64EC) and (AArch64 or ARM64EC or target feature v7) and (ARM or AArch64 or ARM64EC) and target feature neon only.

Insert vector element from another vector element Arm’s documentation