Function vdupq_lane_s64 

pub fn vdupq_lane_s64(a: int64x1_t, const N: 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.

Set all vector lanes to the same value Arm’s documentation