MOVL	b_len+12(FP), DX
	LEAL	ret+16(FP), AX
	JMP	cmpbody<>(SB)

// input:
//   SI = a
//   DI = b
//   BX = alen
//   DX = blen
//   AX = address of return word (set to 1/0/-1)
TEXT cmpbody<>(SB),NOSPLIT,$0-0
	MOVL	DX, BP
	SUBL	BX, DX // DX = blen-alen
	JLE	2(PC)
	MOVL	BX, BP // BP = min(alen, blen)
	CMPL	SI, DI
	JEQ	allsame
	CMPL	BP, $4
	JB	small
#ifdef GO386_softfloat
	JMP	mediumloop
#endif
largeloop:

	return as, nil
}

func parseLinkAddr(b []byte) ([]byte, error) {
	nlen, alen, slen := int(b[1]), int(b[2]), int(b[3])
	l := 4 + nlen + alen + slen
	if len(b) < l {
		return nil, errors.New("invalid address")
	}
	b = b[4:]
	var addr []byte
	if nlen > 0 {
		b = b[nlen:]
	}
	if alen > 0 {
		addr = make([]byte, alen)
		copy(addr, b[:alen])
	}
	return addr, nil

	// care".
	nlen, alen, slen := int(b[1]), int(b[2]), int(b[3])
	if nlen == 0xff {
		nlen = 0
	}
	if alen == 0xff {
		alen = 0
	}
	if slen == 0xff {
		slen = 0
	}
	l := 4 + nlen + alen + slen
	if len(b) < l {
		return 0, nil, errInvalidAddr
	}
	data := b[4:]
	var name string
	var addr []byte
	if nlen > 0 {
		name = string(data[:nlen])

	MOVQ	AX, SI
	MOVQ	DI, DX
	MOVQ	CX, DI
	JMP	cmpbody<>(SB)

// input:
//   SI = a
//   DI = b
//   BX = alen
//   DX = blen
// output:
//   AX = output (-1/0/1)
TEXT cmpbody<>(SB),NOSPLIT,$0-0
	CMPQ	SI, DI
	JEQ	allsame
	CMPQ	BX, DX
	MOVQ	DX, R8
	CMOVQLT	BX, R8 // R8 = min(alen, blen) = # of bytes to compare
	CMPQ	R8, $8
	JB	small

	CMPQ	R8, $63
	JBE	loop
#ifndef hasAVX2

	Get SP
	I64Load a_base+0(FP)
	I64Load a_len+8(FP)
	I64Load b_base+16(FP)
	I64Load b_len+24(FP)
	Call cmpbody<>(SB)
	I64Store ret+32(FP)
	RET

// params: a, alen, b, blen
// ret: -1/0/1
TEXT cmpbody<>(SB), NOSPLIT, $0-0
	// len = min(alen, blen)
	Get R1
	Get R3
	Get R1
	Get R3
	I64LtU
	Select
	Set R4

	Get R0
	I32WrapI64
	Get R2
	I32WrapI64
	Get R4
	I32WrapI64
	Call memcmp<>(SB)

	type linkLayerAddr struct {
		Type byte
		Nlen byte
		Alen byte
		Slen byte
	}
	lla := (*linkLayerAddr)(unsafe.Pointer(&b[0]))
	l := 4 + int(lla.Nlen) + int(lla.Alen) + int(lla.Slen)
	if len(b) < l {
		return nil, 0, EINVAL
	}
	b = b[4:]
	sa := &SockaddrDatalink{Type: lla.Type, Nlen: lla.Nlen, Alen: lla.Alen, Slen: lla.Slen}
	for i := 0; len(sa.Data) > i && i < l-4; i++ {
		sa.Data[i] = int8(b[i])
	}

				ifi := &Interface{Index: int(ifm.Index), Flags: linkFlags(ifm.Flags)}
				ifi.Name = string(sdl.Data[:sdl.Nlen])
				ifi.HardwareAddr = sdl.Data[sdl.Nlen : sdl.Nlen+sdl.Alen]

				// Retrieve MTU
				ifr := &ifreq{}
				copy(ifr.Name[:], ifi.Name)
				err = unix.Ioctl(sock, syscall.SIOCGIFMTU, unsafe.Pointer(ifr))
				if err != nil {
					return nil, err
				}

func mulDenom(z, x, y nat) nat {
	switch {
	case len(x) == 0 && len(y) == 0:
		return z.setWord(1)
	case len(x) == 0:
		return z.set(y)
	case len(y) == 0:
		return z.set(x)
	}
	return z.mul(x, y)
}

// scaleDenom sets z to the product x*f.
// If f == 0 (zero value of denominator), z is set to (a copy of) x.
func (z *Int) scaleDenom(x *Int, f nat) {
	if len(f) == 0 {
		z.Set(x)
		return
	}

func ParseNetlinkMessage(b []byte) ([]NetlinkMessage, error) {
	var msgs []NetlinkMessage
	for len(b) >= NLMSG_HDRLEN {
		h, dbuf, dlen, err := netlinkMessageHeaderAndData(b)
		if err != nil {
			return nil, err
		}
		m := NetlinkMessage{Header: *h, Data: dbuf[:int(h.Len)-NLMSG_HDRLEN]}
		msgs = append(msgs, m)
		b = b[dlen:]
	}
	return msgs, nil
}

	sa.raw.Type = sa.Type
	sa.raw.Nlen = sa.Nlen
	sa.raw.Alen = sa.Alen
	sa.raw.Slen = sa.Slen
	sa.raw.Data = sa.Data
	return unsafe.Pointer(&sa.raw), SizeofSockaddrDatalink, nil
}

func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
	switch rsa.Addr.Family {
	case AF_LINK:
		pp := (*RawSockaddrDatalink)(unsafe.Pointer(rsa))
		sa := new(SockaddrDatalink)
		sa.Len = pp.Len
		sa.Family = pp.Family