[Bug middle-end/48600] [4.6/4.7 Regression] ICE when using cold attribute

["hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48600

--- Comment #15 from Jan Hubicka <hubicka at gcc dot gnu.org> 2012-01-31 14:31:56 UTC ---
I am testing the attached patch 
Index: predict.c
===================================================================
--- predict.c   (revision 183666)
+++ predict.c   (working copy)
@@ -1833,6 +1833,10 @@ predict_paths_for_bb (basic_block cur, b
   edge_iterator ei;
   basic_block son;

+  /* AUX is used to detect cycles while walking predictors with only EH/FAKE
+     succestors.  */
+  cur->aux = (void *)(size_t) 1;
+
   /* We are looking for all edges forming edge cut induced by
      set of all blocks postdominated by BB.  */
   FOR_EACH_EDGE (e, ei, cur->preds)
@@ -1848,7 +1852,7 @@ predict_paths_for_bb (basic_block cur, b
        continue;
       gcc_assert (bb == cur || dominated_by_p (CDI_POST_DOMINATORS, cur, bb));

-      /* See if there is how many edge from e->src that is not abnormal
+      /* See if there is an edge from e->src that is not abnormal
         and does not lead to BB.  */
       FOR_EACH_EDGE (e2, ei2, e->src->succs)
        if (e2 != e
@@ -1864,13 +1868,14 @@ predict_paths_for_bb (basic_block cur, b
         leading to e->src.  */
       if (found)
         predict_edge_def (e, pred, taken);
-      else
+      else if (!e->src->aux)
        predict_paths_for_bb (e->src, e->src, pred, taken);
     }
   for (son = first_dom_son (CDI_POST_DOMINATORS, cur);
        son;
        son = next_dom_son (CDI_POST_DOMINATORS, son))
     predict_paths_for_bb (son, bb, pred, taken);
+  cur->aux = (void *)(size_t) NULL;
 }

 /* Sets branch probabilities according to PREDiction and