Function vrsubhn_u64 

pub fn vrsubhn_u64(a: uint64x2_t, b: uint64x2_t) -> uint32x2_t

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

Rounding subtract returning high narrow Arm’s documentation