extended functionality

[libfirm] / ir / ana / irdom.c

diff --git a/ir/ana/irdom.c b/ir/ana/irdom.c
index 930078e..ffb2c97 100644 (file)
--- a/ir/ana/irdom.c
+++ b/ir/ana/irdom.c
@@ -152,6 +152,7 @@ static void assign_tree_pre_order(ir_node *bl, void *data)
 {
        unsigned *num = data;
        dom_info *bi = get_dom_info(bl);
+
        bi->tree_pre_num = (*num)++;
 }
 
@@ -160,13 +161,16 @@ static void assign_tree_pre_order_max(ir_node *bl, void *data)
        dom_info *bi = get_dom_info(bl);
        ir_node *p;
        unsigned max = 0;
+       unsigned children = 0;
 
        for(p = bi->first; p; p = get_dom_info(p)->next) {
                unsigned max_p = get_dom_info(p)->max_subtree_pre_num;
                max = max > max_p ? max : max_p;
+               children++;
        }
 
-       bi->max_subtree_pre_num = max;
+       bi->max_subtree_pre_num = children > 0 ? max : bi->tree_pre_num;
+       assert(bi->max_subtree_pre_num >= bi->tree_pre_num);
 }
 
 /*--------------------------------------------------------------------*/