Function vdupq_lane_s16 

pub fn vdupq_lane_s16(a: int16x4_t, const N: i32) -> int16x8_t

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

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