func (RegX) IsArg() {}

func (r RegX) String() string {
	return fmt.Sprintf("%s[%d]", r.Reg, r.Index)
}

// A RegList is a register list.
// Bits at indexes x = 0 through 15 indicate whether the corresponding Rx register is in the list.
type RegList uint16

func (RegList) IsArg() {}

func (r RegList) String() string {
	var buf bytes.Buffer
	fmt.Fprintf(&buf, "{")
	sep := ""
	for i := 0; i < 16; i++ {

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package arm

var cnames5 = []string{
	"NONE",
	"REG",
	"REGREG",
	"REGREG2",
	"REGLIST",
	"SHIFT",
	"SHIFTADDR",
	"FREG",
	"PSR",
	"FCR",
	"SPR",
	"RCON",
	"NCON",
	"RCON2A",
	"RCON2S",
	"SCON",
	"LCON",
	"LCONADDR",
	"ZFCON",
	"SFCON",
	"LFCON",
	"RACON",

			if argIndex == 0 {
				return fmt.Sprintf("r%d", int32(arg))
			}
		}
		switch arg {
		case R10:
			return "sl"
		case R11:
			return "fp"
		case R12:
			return "ip"
		}

	case RegList:
		var buf bytes.Buffer
		fmt.Fprintf(&buf, "{")
		sep := ""
		for i := 0; i < 16; i++ {
			if arg&(1<<uint(i)) != 0 {
				fmt.Fprintf(&buf, "%s%s", sep, gnuArg(inst, -1, Reg(i)))
				sep = ", "
			}

	case arg_registers:
		return RegList(x & (1<<16 - 1))

	case arg_registers2:
		x &= 1<<16 - 1
		n := 0
		for i := 0; i < 16; i++ {
			if x>>uint(i)&1 != 0 {
				n++
			}
		}
		if n < 2 {
			return nil
		}
		return RegList(x)

	case arg_registers1:
		Rt := (x >> 12) & (1<<4 - 1)
		return RegList(1 << Rt)

	case arg_satimm4:

			v := s.regs[r].v
			if v == nil {
				continue
			}
			k++
		}
		regList := make([]endReg, 0, k)
		for r := register(0); r < s.numRegs; r++ {
			v := s.regs[r].v
			if v == nil {
				continue
			}
			regList = append(regList, endReg{r, v, s.regs[r].c})
		}
		s.endRegs[b.ID] = regList

		if checkEnabled {
			regValLiveSet.clear()
			for _, x := range s.live[b.ID] {

			return fmt.Sprintf("%s(SB)", s)
		}
		return fmt.Sprintf("%#x", addr)

	case Reg:
		if a < 16 {
			return fmt.Sprintf("R%d", int(a))
		}

	case RegList:
		var buf bytes.Buffer
		start := -2
		end := -2
		fmt.Fprintf(&buf, "[")
		flush := func() {
			if start >= 0 {
				if buf.Len() > 1 {
					fmt.Fprintf(&buf, ",")
				}
				if start == end {

//
// MOVM
//
//	LTYPE8 cond ioreg ',' '[' reglist ']'
//	{
//		var g obj.Addr
//
//		g = nullgen;
//		g.Type = obj.TYPE_CONST;
//		g.Offset = int64($6);
//		outcode($1, $2, &$3, 0, &g);
//	}
	MOVM	0(R1), [R2,R5,R8,g] // MOVM	(R1), [R2,R5,R8,g]
	MOVM	(R1), [R2-R5] // MOVM (R1), [R2,R3,R4,R5]
	MOVM	(R1), [R2]

//	LTYPE8 cond '[' reglist ']' ',' ioreg
//	{
//		var g obj.Addr
//