Function vaddhn_high_s64 

pub fn vaddhn_high_s64(r: int32x2_t, a: int64x2_t, b: int64x2_t) -> int32x4_t

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

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

Add returning High Narrow (high half). Arm’s documentation