sw := &Switch{Expr: exprf("v.Op")}
	for _, op := range ops {
		eop, ok := parseEllipsisRules(oprules[op], arch)
		if ok {
			if strings.Contains(oprules[op][0].Rule, "=>") && opByName(arch, op).aux != opByName(arch, eop).aux {
				panic(fmt.Sprintf("can't use ... for ops that have different aux types: %s and %s", op, eop))
			}
			swc := &Case{Expr: exprf("%s", op)}
			swc.add(stmtf("v.Op = %s", eop))