Function expr_eliminate_eq

scripts/config/expr.c:221–241

* Rewrites the expressions 'ep1' and 'ep2' to remove operands common to both. * Example reductions: * * ep1: A && B -> ep1: y * ep2: A && B && C -> ep2: C * * ep1: A || B -> ep1: n * ep2: A || B || C -> ep2: C * * ep1: A && (B && FOO) -> ep1: FOO * ep2: (BAR && B) && A -> ep2: BAR * * ep1: A && (B || C) -> ep1: y * ep2: (C || B) && A -> ep

 * See __expr_eliminate_eq() as well.
 */
void expr_eliminate_eq(struct expr **ep1, struct expr **ep2)
{
	if (!e1 || !e2)
		return;
	switch (e1->type) {
	case E_OR:
	case E_AND:
		__expr_eliminate_eq(e1->type, ep1, ep2);
	default:
		;
	}
	if (e1->type != e2->type) switch (e2->type) {
	case E_OR:
	case E_AND:
		__expr_eliminate_eq(e2->type, ep1, ep2);
	default:
		;
	}
	e1 = expr_eliminate_yn(e1);
	e2 = expr_eliminate_yn(e2);
}

#undef e1
#undef e2