re PR middle-end/77484 (Static branch predictor causes ~6-8% regression of SPEC2000 GAP)

	PR middle-end/77484
	* predict.def (PRED_POLYMORPHIC_CALL): Set to 58
	* predict.c (tree_estimate_probability_bb): Reverse direction of
	polymorphic call predictor.

From-SVN: r244167

gcc/ChangeLog

+2017-01-01  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR middle-end/77484
+	* predict.def (PRED_POLYMORPHIC_CALL): Set to 58
+	* predict.c (tree_estimate_probability_bb): Reverse direction of
+	polymorphic call predictor.
+
 2017-01-06  David Malcolm  <dmalcolm@redhat.com>
 
 	* passes.c (execute_one_pass): Split out pass-skipping logic

gcc/predict.c

@@ -2789,7 +2789,7 @@ tree_estimate_probability_bb (basic_block bb)
 		  if (gimple_call_fndecl (stmt))
 		    predict_edge_def (e, PRED_CALL, NOT_TAKEN);
 		  else if (virtual_method_call_p (gimple_call_fn (stmt)))
-		    predict_edge_def (e, PRED_POLYMORPHIC_CALL, TAKEN);
+		    predict_edge_def (e, PRED_POLYMORPHIC_CALL, NOT_TAKEN);
 		  else
 		    predict_edge_def (e, PRED_INDIR_CALL, TAKEN);
 		  break;

gcc/predict.def

@@ -122,7 +122,7 @@ DEF_PREDICTOR (PRED_CALL, "call", HITRATE (55), 0)
    less reliable for indirect calls and polymorphic calls.  For spec2k6
    the predictio nis slightly in the direction of taking the call.  */
 DEF_PREDICTOR (PRED_INDIR_CALL, "indirect call", HITRATE (51), 0)
-DEF_PREDICTOR (PRED_POLYMORPHIC_CALL, "polymorphic call", HITRATE (58), 0)
+DEF_PREDICTOR (PRED_POLYMORPHIC_CALL, "polymorphic call", HITRATE (59), 0)
 
 /* Recursive calls are usually not taken or the function will recurse
    indefinitely.  */