Function vext_p8 

pub fn vext_p8(a: poly8x8_t, b: poly8x8_t, const N: i32) -> poly8x8_t

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

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

Extract vector from pair of vectors Arm’s documentation