gimple-ssa-isolate-paths.c (isolate_path): Set edge leading to path as unlikely; update profile.

	* gimple-ssa-isolate-paths.c (isolate_path): Set edge leading to path
	as unlikely; update profile.

From-SVN: r249277

gcc/ChangeLog

 2017-06-16  Jan Hubicka  <hubicka@ucw.cz>
 
+	* gimple-ssa-isolate-paths.c (isolate_path): Set edge leading to path
+	as unlikely; update profile.
+
+2017-06-16  Jan Hubicka  <hubicka@ucw.cz>
+
 	* predict.c (force_edge_cold): Handle declaring edges impossible
 	more aggresively.
 

gcc/gimple-ssa-isolate-paths.c

@@ -137,6 +137,15 @@ isolate_path (basic_block bb, basic_block duplicate,
   gimple_stmt_iterator si, si2;
   edge_iterator ei;
   edge e2;
+  bool impossible = true;
+
+  for (si = gsi_start_bb (bb); gsi_stmt (si) != stmt; gsi_next (&si))
+    if (stmt_can_terminate_bb_p (gsi_stmt (si)))
+      {
+	impossible = false;
+	break;
+      }
+  force_edge_cold (e, impossible);
 
   /* First duplicate BB if we have not done so already and remove all
      the duplicate's outgoing edges as duplicate is going to unconditionally
@@ -145,10 +154,14 @@ isolate_path (basic_block bb, basic_block duplicate,
   if (!duplicate)
     {
       duplicate = duplicate_block (bb, NULL, NULL);
+      bb->frequency = 0;
+      bb->count = profile_count::zero ();
       if (!ret_zero)
 	for (ei = ei_start (duplicate->succs); (e2 = ei_safe_edge (ei)); )
 	  remove_edge (e2);
     }
+  bb->frequency += EDGE_FREQUENCY (e);
+  bb->count += e->count;
 
   /* Complete the isolation step by redirecting E to reach DUPLICATE.  */
   e2 = redirect_edge_and_branch (e, duplicate);