Function vsubhn_s64 

pub fn vsubhn_s64(a: int64x2_t, b: int64x2_t) -> int32x2_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.

Subtract returning high narrow Arm’s documentation