Function vext_p16 

pub fn vext_p16(a: poly16x4_t, b: poly16x4_t, const N: i32) -> poly16x4_t

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

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

Extract vector from pair of vectors Arm’s documentation