if isRequestingLowPageBits(t) {
		// corresponding immediate field is 12 bits wide
		return tgt & 0xfff
	}

	pageDelta := (tgt >> 12) - (pc >> 12)
	if tgt&0xfff >= 0x800 {
		// adjust for sign-extended addition of the low bits
		pageDelta += 1
	}
	// corresponding immediate field is 20 bits wide
	return pageDelta & 0xfffff

	SIGSYS    = C.SIGSYS

	FPE_INTDIV = C.FPE_INTDIV & 0xFFFF
	FPE_INTOVF = C.FPE_INTOVF & 0xFFFF
	FPE_FLTDIV = C.FPE_FLTDIV & 0xFFFF
	FPE_FLTOVF = C.FPE_FLTOVF & 0xFFFF
	FPE_FLTUND = C.FPE_FLTUND & 0xFFFF
	FPE_FLTRES = C.FPE_FLTRES & 0xFFFF
	FPE_FLTINV = C.FPE_FLTINV & 0xFFFF
	FPE_FLTSUB = C.FPE_FLTSUB & 0xFFFF

	BUS_ADRALN = C.BUS_ADRALN & 0xFFFF
	BUS_ADRERR = C.BUS_ADRERR & 0xFFFF
	BUS_OBJERR = C.BUS_OBJERR & 0xFFFF

iptables -t mangle -A ISTIO_OUTPUT -m connmark --mark 0x111/0xfff -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
iptables -t nat -A ISTIO_OUTPUT ! -o lo -p udp -m udp --dport 53 -j REDIRECT --to-port 15053
iptables -t nat -A ISTIO_OUTPUT -p tcp -m mark --mark 0x111/0xfff -j ACCEPT

    val flags = buf.readShort().toInt() and 0xffff
    require(flags shr 15 != 0) { "not a response" }

    val responseCode = flags and 0xf

    if (responseCode == NXDOMAIN) {
      throw UnknownHostException("$hostname: NXDOMAIN")
    } else if (responseCode == SERVFAIL) {
      throw UnknownHostException("$hostname: SERVFAIL")
    }

    val questionCount = buf.readShort().toInt() and 0xffff

big_loop:
	MOVOU	(SI), X0
	MOVOU	(DI), X1
	PCMPEQB X0, X1
	PMOVMSKB X1, AX
	XORQ	$0xffff, AX
	JNE	diff16

	MOVOU	16(SI), X0
	MOVOU	16(DI), X1
	PCMPEQB X0, X1
	PMOVMSKB X1, AX
	XORQ	$0xffff, AX
	JNE	diff32

	MOVOU	32(SI), X0
	MOVOU	32(DI), X1
	PCMPEQB X0, X1
	PMOVMSKB X1, AX
	XORQ	$0xffff, AX
	JNE	diff48

	MOVOU	48(SI), X0
	MOVOU	48(DI), X1
	PCMPEQB X0, X1

		println("bad f16", got)
	}
	if got := f8(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1); got != 0xff {
		println("bad f8", got)
	}
	if got := g32(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff); got != -1 {
		println("bad g32", got)
	}
	if got := g16(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xffff); got != -1 {
		println("bad g16", got)
	}

	unlock(&mtx)
	return 0
}

const disarmed = 0xFFFF

func netpollarm(pd *pollDesc, mode int) {
	lock(&mtx)

	var s subscription

	s.userdata = userdata(uintptr(unsafe.Pointer(pd)))

	fdReadwrite := s.u.subscriptionFdReadwrite()
	fdReadwrite.fd = int32(pd.fd)

	ridx := int(pd.user >> 16)
	widx := int(pd.user & 0xFFFF)

	}
	return color.Transparent
}

// RGBA64At implements the [RGBA64Image] interface.
func (r Rectangle) RGBA64At(x, y int) color.RGBA64 {
	if (Point{x, y}).In(r) {
		return color.RGBA64{0xffff, 0xffff, 0xffff, 0xffff}
	}
	return color.RGBA64{}
}

// Bounds implements the [Image] interface.
func (r Rectangle) Bounds() Rectangle {
	return r
}

// ColorModel implements the [Image] interface.

	PCMPEQB X1, X2
	PMOVMSKB X2, SI
	CMPQ  SI, $0xffff
	JE   success
	ADDQ $1,DI
	CMPQ DI,DX
	JB loop16
	JMP fail
_17_or_more:
	CMPQ AX, $31
	JA   _32_or_more
	LEAQ 1(DI)(DX*1), DX
	SUBQ AX, DX
	MOVOU -16(R8)(AX*1), X0
	MOVOU (R8), X1
loop17to31:
	MOVOU (DI), X2
	PCMPEQB X1,X2
	PMOVMSKB X2, SI
	CMPQ  SI, $0xffff
	JE   partial_success17to31
	ADDQ $1,DI
	CMPQ DI,DX

	sysInst := sysInstFields{uint8(op1), uint8(crn), uint8(crm), uint8(op2)}
	return sysInst.getType()
}

func is_zero(x uint32) bool {
	return x == 0
}

func is_ones_n16(x uint32) bool {
	return x == 0xffff
}

func bit_count(x uint32) uint8 {
	var count uint8
	for count = 0; x > 0; x >>= 1 {
		if (x & 1) == 1 {
			count++
		}
	}
	return count