Function vrsubhn_high_u64 

pub fn vrsubhn_high_u64(
    a: uint32x2_t,
    b: uint64x2_t,
    c: uint64x2_t,
) -> uint32x4_t

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

Rounding subtract returning high narrow Arm’s documentation