Function vdupq_lane_p8 

pub fn vdupq_lane_p8(a: poly8x8_t, const N: i32) -> poly8x16_t

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

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