return true
	}
	if a.tag != b.tag {
		return false
	}
	if a.tag == constant {
		// The same content of const value may be different, we should
		// compare with auxInt instead
		v1 := a.val
		v2 := b.val
		if v1.Op == v2.Op && v1.AuxInt == v2.AuxInt {
			return true
		} else {
			return false
		}
	}
	return true
}

// possibleConst checks if Value can be folded to const. For those Values that can

	default:
		log.Fatalf("too many controls: %d", outdata.controls)
	}

	if auxint != "" {
		// Make sure auxint value has the right type.
		rr.add(stmtf("b.AuxInt = %sToAuxInt(%s)", unTitle(outdata.auxIntType()), auxint))
	}
	if aux != "" {
		// Make sure aux value has the right type.
		rr.add(stmtf("b.Aux = %sToAux(%s)", unTitle(outdata.auxType()), aux))
	}

const (
	auxNone           auxType = iota
	auxBool                   // auxInt is 0/1 for false/true
	auxInt8                   // auxInt is an 8-bit integer
	auxInt16                  // auxInt is a 16-bit integer
	auxInt32                  // auxInt is a 32-bit integer
	auxInt64                  // auxInt is a 64-bit integer
	auxInt128                 // auxInt represents a 128-bit integer.  Always 0.

func cmpVal(v, w *Value, auxIDs auxmap) types.Cmp {
	// Try to order these comparison by cost (cheaper first)
	if v.Op != w.Op {
		return lt2Cmp(v.Op < w.Op)
	}
	if v.AuxInt != w.AuxInt {
		return lt2Cmp(v.AuxInt < w.AuxInt)
	}
	if len(v.Args) != len(w.Args) {
		return lt2Cmp(len(v.Args) < len(w.Args))
	}
	if v.Op == OpPhi && v.Block != w.Block {
		return lt2Cmp(v.Block.ID < w.Block.ID)
	}

	// constants. Constant values are stored in the aux or
	// auxint fields.
	{name: "ConstBool", aux: "Bool"},     // auxint is 0 for false and 1 for true
	{name: "ConstString", aux: "String"}, // value is aux.(string)
	{name: "ConstNil", typ: "BytePtr"},   // nil pointer
	{name: "Const8", aux: "Int8"},        // auxint is sign-extended 8 bits
	{name: "Const16", aux: "Int16"},      // auxint is sign-extended 16 bits

		old, ok := ft.limits[v.ID]
		if !ok {
			old = noLimit
			if v.isGenericIntConst() {
				switch d {
				case signed:
					old.min, old.max = v.AuxInt, v.AuxInt
					if v.AuxInt >= 0 {
						old.umin, old.umax = uint64(v.AuxInt), uint64(v.AuxInt)
					}
				case unsigned:
					old.umin = v.AuxUnsigned()
					old.umax = old.umin
					if int64(old.umin) >= 0 {

		a := v.Args[0].Reg()
		if r == a {
			if v.AuxInt == 1 {
				p := s.Prog(x86.AINCL)
				p.To.Type = obj.TYPE_REG
				p.To.Reg = r
				return
			}
			if v.AuxInt == -1 {
				p := s.Prog(x86.ADECL)
				p.To.Type = obj.TYPE_REG
				p.To.Reg = r
				return
			}
			p := s.Prog(v.Op.Asm())
			p.From.Type = obj.TYPE_CONST
			p.From.Offset = v.AuxInt
			p.To.Type = obj.TYPE_REG
			p.To.Reg = r

	}
	return int32(sh<<16 | mb<<8 | me)
}

func GetPPC64Shiftsh(auxint int64) int64 {
	return int64(int8(auxint >> 16))
}

func GetPPC64Shiftmb(auxint int64) int64 {
	return int64(int8(auxint >> 8))
}

func GetPPC64Shiftme(auxint int64) int64 {
	return int64(int8(auxint))
}

// Test if this value can encoded as a mask for a rlwinm like

		{name: "LoweredInterCall", argLength: 2, reg: regInfo{inputs: []regMask{gp}, clobbers: callerSave}, aux: "CallOff", call: true},          // call fn by pointer. arg0=codeptr, arg1=mem, auxint=argsize, returns mem

		{name: "LoweredAddr", argLength: 1, reg: gp11, aux: "SymOff", rematerializeable: true, symEffect: "Addr"}, // returns base+aux+auxint, arg0=base

func (b *Block) AuxIntString() string {
	switch b.Kind.AuxIntType() {
	case "int8":
		return fmt.Sprintf("%v", int8(b.AuxInt))
	case "uint8":
		return fmt.Sprintf("%v", uint8(b.AuxInt))
	case "": // no aux int type
		return ""
	default: // type specified but not implemented - print as int64
		return fmt.Sprintf("%v", b.AuxInt)
	}
}

// likelyBranch reports whether block b is the likely branch of all of its predecessors.