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
