Function vextq_u64 

pub fn vextq_u64(a: uint64x2_t, b: uint64x2_t, const N: i32) -> uint64x2_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.

Extract vector from pair of vectors Arm’s documentation