Function vsetq_lane_p16 

pub fn vsetq_lane_p16(a: u16, b: poly16x8_t, const LANE: i32) -> poly16x8_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