* cfganal.c (compute_dominance_frontiers_1): Don't be quadratic.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@116909 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/ChangeLog

+2006-09-13  Jan Hubicka  <jh@suse.cz>
+
+	* cfganal.c (compute_dominance_frontiers_1): Don't be quadratic.
+
 2006-09-12  Eric Botcazou  <ebotcazou@libertysurf.fr>
 	PR rtl-optimization/28243

gcc/cfganal.c

@@ -1054,6 +1054,8 @@ compute_dominance_frontiers_1 (bitmap *frontiers)
 	      domsb = get_immediate_dominator (CDI_DOMINATORS, b);
 	      while (runner != domsb)
 		{
+		  if (bitmap_bit_p (frontiers[runner->index], b->index))
+		    break;
 		  bitmap_set_bit (frontiers[runner->index],
 				  b->index);
 		  runner = get_immediate_dominator (CDI_DOMINATORS,