genFile := &File{Arch: arch, Suffix: suff}
	// Main rewrite routine is a switch on v.Op.
	fn := &Func{Kind: "Value", ArgLen: -1}

	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 {