bb-reorder.c (better_edge_p): Do not build traces across abnormal/eh edges...

	* bb-reorder.c (better_edge_p): Do not build traces across abnormal/eh
	edges; zero probability is not better than uninitialized.

From-SVN: r250033

gcc/ChangeLog

+2017-07-06  Jan Hubicka  <hubicka@ucw.cz>
+
+	* bb-reorder.c (better_edge_p): Do not build traces across abnormal/eh
+	edges; zero probability is not better than uninitialized.
+
 2017-07-06  Maxim Ostapenko  <m.ostapenko@samsung.com>
 
 	* asan.h (asan_sanitize_allocas_p): Declare.

gcc/bb-reorder.c

@@ -957,7 +957,14 @@ better_edge_p (const_basic_block bb, const_edge e, profile_probability prob,
     return !cur_best_edge
 	   || cur_best_edge->dest->index > e->dest->index;
 
-  if (prob > best_prob + diff_prob || !best_prob.initialized_p ())
+  /* Those edges are so expensive that continuing a trace is not useful
+     performance wise.  */
+  if (e->flags & (EDGE_ABNORMAL | EDGE_EH))
+    return false;
+
+  if (prob > best_prob + diff_prob
+      || (!best_prob.initialized_p ()
+	  && prob > profile_probability::guessed_never ()))
     /* The edge has higher probability than the temporary best edge.  */
     is_better_edge = true;
   else if (prob < best_prob - diff_prob)