Function vdup_laneq_s64 

pub fn vdup_laneq_s64(a: int64x2_t, const N: i32) -> int64x1_t

🔬This is a nightly-only experimental API. (stdarch_arm_neon_intrinsics #111800)

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

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