return ip.addr.xor(p.ip.addr).and(mask6(p.Bits())).isZero()
	}
}

// Overlaps reports whether p and o contain any IP addresses in common.
//
// If p and o are of different address families or either have a zero
// IP, it reports false. Like the Contains method, a prefix with an
// IPv4-mapped IPv6 address is still treated as an IPv6 mask.
func (p Prefix) Overlaps(o Prefix) bool {

		}
	}
	return true
}

// Mask returns the result of masking the IP address ip with mask.
func (ip IP) Mask(mask IPMask) IP {
	if len(mask) == IPv6len && len(ip) == IPv4len && allFF(mask[:12]) {
		mask = mask[12:]
	}
	if len(mask) == IPv4len && len(ip) == IPv6len && bytealg.Equal(ip[:12], v4InV6Prefix) {
		ip = ip[12:]
	}
	n := len(ip)
	if n != len(mask) {
		return nil
	}
	out := make(IP, n)

func ValidatePodSubnetNodeMask(subnetStr string, c *kubeadm.ClusterConfiguration, fldPath *field.Path) field.ErrorList {
	allErrs := field.ErrorList{}
	// subnets were already validated
	subnets, _ := netutils.ParseCIDRs(strings.Split(subnetStr, ","))
	for _, podSubnet := range subnets {
		// obtain podSubnet mask
		mask := podSubnet.Mask
		maskSize, _ := mask.Size()

	} else if nbits == 32 {
		mb = bits.LeadingZeros32(uint32(mask))
		me = 32 - bits.TrailingZeros32(uint32(mask))
		mbn = bits.LeadingZeros32(^uint32(mask))
		men = 32 - bits.TrailingZeros32(^uint32(mask))
	} else {
		mb = bits.LeadingZeros64(uint64(mask))
		me = 64 - bits.TrailingZeros64(uint64(mask))
		mbn = bits.LeadingZeros64(^uint64(mask))
		men = 64 - bits.TrailingZeros64(^uint64(mask))
	}

the SIGPROF signal in particular.

The non-Go code should not change the signal mask on any threads
created by the Go runtime. If the non-Go code starts new threads
itself, those threads may set the signal mask as they please.

If the non-Go code starts a new thread, changes the signal mask, and
then invokes a Go function in that thread, the Go runtime will

	s += "INS:\n"
	for _, i := range r.inputs {
		mask := fmt.Sprintf("%64b", i.regs)
		mask = strings.Replace(mask, "0", ".", -1)
		s += fmt.Sprintf("%2d |%s|\n", i.idx, mask)
	}
	s += "OUTS:\n"
	for _, i := range r.outputs {
		mask := fmt.Sprintf("%64b", i.regs)
		mask = strings.Replace(mask, "0", ".", -1)
		s += fmt.Sprintf("%2d |%s|\n", i.idx, mask)
	}
	s += "CLOBBERS:\n"
	mask := fmt.Sprintf("%64b", r.clobbers)

	// the address of the first word referenced by mask.
	addr uintptr

	// mask is a bitmask where each bit corresponds to pointer-words after addr.
	// Bit 0 is the pointer-word at addr, Bit 1 is the next word, and so on.
	// If a bit is 1, then there is a pointer at that word.
	// nextFast and next mask out bits in this mask as their pointers are processed.
	mask uintptr

	var mask [gcmBlockSize]byte

	for len(in) >= gcmBlockSize {
		g.cipher.Encrypt(mask[:], counter[:])
		gcmInc32(counter)

		subtle.XORBytes(out, in, mask[:])
		out = out[gcmBlockSize:]
		in = in[gcmBlockSize:]
	}

	if len(in) > 0 {
		g.cipher.Encrypt(mask[:], counter[:])
		gcmInc32(counter)
		subtle.XORBytes(out, in, mask[:])
	}
}

// And atomically performs a bitwise AND operation on x using the bitmask
// provided as mask and returns the old value.
func (x *Int32) And(mask int32) (old int32) { return AndInt32(&x.v, mask) }

// Or atomically performs a bitwise OR operation on x using the bitmask
// provided as mask and returns the old value.
func (x *Int32) Or(mask int32) (old int32) { return OrInt32(&x.v, mask) }

// An Int64 is an atomic int64. The zero value is zero.

	maskUpdatedChan = make(chan struct{})
	disableSigChan = make(chan uint32)
	enableSigChan = make(chan uint32)
	go func() {
		// Signal masks are per-thread, so make sure this goroutine stays on one
		// thread.
		LockOSThread()
		defer UnlockOSThread()
		// The sigBlocked mask contains the signals not active for os/signal,
		// initially all signals except the essential. When signal.Notify()/Stop is called,