Simplify: if (!irn_visited(x)) { mark_irn_visited(x); ... } -> if...

Simplify: if (!irn_visited(x)) { mark_irn_visited(x); ... }  ->  if (!irn_visited_else_mark(x)) { ... }.

ir/ir/ircons.c

@@ -285,13 +285,11 @@ static ir_node *get_r_value_internal(ir_node *block, int pos, ir_mode *mode)
 		return res;
 
 	/* We ran into a cycle. This may happen in unreachable loops. */
-	if (irn_visited(block)) {
+	if (irn_visited_else_mark(block)) {
 		/* Since the loop is unreachable, return a Bad. */
 		return new_r_Bad(irg);
 	}
 
-	mark_irn_visited(block);
-
 	/* in a matured block we can immediately determine the phi arguments */
 	if (get_Block_matured(block)) {
 		int arity = get_irn_arity(block);
@@ -598,9 +596,8 @@ static ir_mode *guess_recursively(ir_node *block, int pos)
 	int      n_preds;
 	int      i;
 
-	if (irn_visited(block))
+	if (irn_visited_else_mark(block))
 		return NULL;
-	mark_irn_visited(block);
 
 	/* already have a defintion -> we can simply look at its mode */
 	value = block->attr.block.graph_arr[pos];

ir/ir/irdump.c

@@ -1191,8 +1191,7 @@ static void dump_const_node_local(FILE *F, ir_node *n)
 
 	for (i = 0; i < get_irn_arity(n); i++) {
 		ir_node *con = get_irn_n(n, i);
-		if (is_constlike_node(con) && !irn_visited(con)) {
-			mark_irn_visited(con);
+		if (is_constlike_node(con) && !irn_visited_else_mark(con)) {
 			/* Generate a new name for the node by appending the names of
 			n and const. */
 			fprintf(F, "node: {title: "); PRINT_CONSTID(n, con);

ir/ir/iredges.c

@@ -1005,9 +1005,8 @@ static void irg_walk_edges2(ir_node *node, irg_walk_func *pre,
 {
 	const ir_edge_t *edge, *next;
 
-	if (irn_visited(node))
+	if (irn_visited_else_mark(node))
 		return;
-	mark_irn_visited(node);
 
 	if (pre != NULL)
 		pre(node, env);

ir/lower/lower_dw.c

@@ -2213,9 +2213,8 @@ static void lower_node(lower_env_t *env, ir_node *node)
 	unsigned      idx;
 	node_entry_t *entry;
 
-	if (irn_visited(node))
+	if (irn_visited_else_mark(node))
 		return;
-	mark_irn_visited(node);
 
 	/* cycles are always broken at Phi and Block nodes. So we don't need special
 	 * magic in all the other lower functions */