Function vdup_laneq_p16 

pub fn vdup_laneq_p16(a: poly16x8_t, const N: i32) -> poly16x4_t

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

Available on (AArch64 or target_arch=arm64ec) and target feature neon and target feature v7 only.

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