check.recordBuiltinType(call.Fun, sig)
		}

	case _Cap, _Len:
		// cap(x)
		// len(x)
		mode := invalid
		var val constant.Value
		switch t := arrayPtrDeref(under(x.typ)).(type) {
		case *Basic:
			if isString(t) && id == _Len {
				if x.mode == constant_ {
					mode = constant_
					val = constant.MakeInt64(int64(len(constant.StringVal(x.val))))
				} else {
					mode = value
				}
			}

			check.recordBuiltinType(call.Fun, sig)
		}

	case _Cap, _Len:
		// cap(x)
		// len(x)
		mode := invalid
		var val constant.Value
		switch t := arrayPtrDeref(under(x.typ)).(type) {
		case *Basic:
			if isString(t) && id == _Len {
				if x.mode == constant_ {
					mode = constant_
					val = constant.MakeInt64(int64(len(constant.StringVal(x.val))))
				} else {
					mode = value
				}
			}

	_Complex: {"complex", 2, false, expression},
	_Copy:    {"copy", 2, false, statement},
	_Delete:  {"delete", 2, false, statement},
	_Imag:    {"imag", 1, false, expression},
	_Len:     {"len", 1, false, expression},
	_Make:    {"make", 1, true, expression},
	// To disable max/min, remove the next two lines.
	_Max:     {"max", 1, true, expression},
	_Min:     {"min", 1, true, expression},

	_Complex: {"complex", 2, false, expression},
	_Copy:    {"copy", 2, false, statement},
	_Delete:  {"delete", 2, false, statement},
	_Imag:    {"imag", 1, false, expression},
	_Len:     {"len", 1, false, expression},
	_Make:    {"make", 1, true, expression},
	// To disable max/min, remove the next two lines.
	_Max:     {"max", 1, true, expression},
	_Min:     {"min", 1, true, expression},

		return
	}
	if kind != 0 && kind != vk {
		var inner bytes.Buffer
		if len(v.inner) > 0 {
			fmt.Fprintf(&inner, " containing")
			for i, vi := range v.inner {
				if i > 0 && len(v.inner) > 2 {
					fmt.Fprintf(&inner, ",")
				}
				fmt.Fprintf(&inner, " ")
				if i > 0 && i == len(v.inner)-1 {
					fmt.Fprintf(&inner, "and ")
				}
				fmt.Fprintf(&inner, "%s+%d(FP)", vi.name, vi.off)

TEXT ·Compare<ABIInternal>(SB),NOSPLIT,$0-56
	// R4 = a_base
	// R5 = a_len
	// R6 = a_cap (unused)
	// R7 = b_base (want in R6)
	// R8 = b_len (want in R7)
	// R9 = b_cap (unused)
	MOVV	R7, R6
	MOVV	R8, R7
	JMP	cmpbody<>(SB)

TEXT runtime·cmpstring<ABIInternal>(SB),NOSPLIT,$0-40
	// R4 = a_base
	// R5 = a_len
	// R6 = b_base
	// R7 = b_len
	JMP	cmpbody<>(SB)

// On entry:
// R5 length of a

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
}

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
	}

	// X10 = a_base
	// X11 = a_len
	// X12 = a_cap (unused)
	// X13 = b_base (want in X12)
	// X14 = b_len (want in X13)
	// X15 = b_cap (unused)
	MOV	X13, X12
	MOV	X14, X13
	JMP	compare<>(SB)

TEXT runtime·cmpstring<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-40
	// X10 = a_base
	// X11 = a_len
	// X12 = b_base
	// X13 = b_len
	JMP	compare<>(SB)

// On entry:
// X10 points to start of a

#include "textflag.h"

TEXT ·Index(SB),NOSPLIT,$0-56
	MOVQ a_base+0(FP), DI
	MOVQ a_len+8(FP), DX
	MOVQ b_base+24(FP), R8
	MOVQ b_len+32(FP), AX
	MOVQ DI, R10
	LEAQ ret+48(FP), R11
	JMP  indexbody<>(SB)

TEXT ·IndexString(SB),NOSPLIT,$0-40
	MOVQ a_base+0(FP), DI
	MOVQ a_len+8(FP), DX
	MOVQ b_base+16(FP), R8
	MOVQ b_len+24(FP), AX
	MOVQ DI, R10
	LEAQ ret+32(FP), R11
	JMP  indexbody<>(SB)