// generate block kind auxint method
	fmt.Fprintln(w, "func (k BlockKind) AuxIntType() string {")
	fmt.Fprintln(w, "switch k {")
	for _, a := range archs {
		for _, b := range a.blocks {
			if b.auxIntType() == "invalid" {
				continue
			}
			fmt.Fprintf(w, "case Block%s%s: return \"%s\"\n", a.Name(), b.name, b.auxIntType())
		}
	}
	fmt.Fprintln(w, "}")
	fmt.Fprintln(w, "return \"\"")

		return "s390x.CCMask"
	case "S390XRotateParams":
		return "s390x.RotateParams"
	default:
		return "invalid"
	}
}

// auxIntType returns the Go type that this operation should store in its auxInt field.
func (op opData) auxIntType() string {
	switch op.aux {
	case "Bool":
		return "bool"
	case "Int8":
		return "int8"
	case "Int16":
		return "int16"
	case "Int32":

		return false
	}
	for _, v := range b.Values {
		if v.LackingPos() {
			continue
		}
		return false
	}
	return true
}

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 ""

	BlockRetJmp:    "RetJmp",
	BlockExit:      "Exit",
	BlockJumpTable: "JumpTable",
	BlockFirst:     "First",
}

func (k BlockKind) String() string { return blockString[k] }
func (k BlockKind) AuxIntType() string {
	switch k {
	case BlockARM64TBZ:
		return "int64"
	case BlockARM64TBNZ:
		return "int64"
	case BlockS390XCIJ:
		return "int8"
	case BlockS390XCGIJ:
		return "int8"