public static Vector256 <ushort> negate(Vector256 <ushort> src) => add(BitUtil.flip(src), Vec256.Ones <ushort>());
public static Vector128 <ulong> negate(Vector128 <ulong> src) => add(BitUtil.flip(src), Vec128.Ones <ulong>());
public static Vector256 <byte> negate(Vector256 <byte> src) => add(BitUtil.flip(src), Vec256.Ones <byte>());
public static Vector128 <byte> negate(Vector128 <byte> src) => add(BitUtil.flip(src), Vec128.Ones <byte>());