Remove predictors that are unrealiable.

2018-01-23  Martin Liska  <mliska@suse.cz>

	* predict.def (PRED_INDIR_CALL): Set probability to PROB_EVEN in
	order to ignore the predictor.
	(PRED_POLYMORPHIC_CALL): Likewise.
	(PRED_RECURSIVE_CALL): Likewise.

From-SVN: r256988

gcc/ChangeLog

 2018-01-23  Martin Liska  <mliska@suse.cz>
 
+	* predict.def (PRED_INDIR_CALL): Set probability to PROB_EVEN in
+	order to ignore the predictor.
+	(PRED_POLYMORPHIC_CALL): Likewise.
+	(PRED_RECURSIVE_CALL): Likewise.
+
+2018-01-23  Martin Liska  <mliska@suse.cz>
+
 	* tree-profile.c (tree_profiling): Print function header to
 	aware reader which function we are working on.
 	* value-prof.c (gimple_find_values_to_profile): Do not print

gcc/predict.c

@@ -4216,7 +4216,7 @@ test_prediction_value_range ()
 	continue;
 
       unsigned p = 100 * predictors[i].probability / REG_BR_PROB_BASE;
-      ASSERT_TRUE (p > 50 && p <= 100);
+      ASSERT_TRUE (p >= 50 && p <= 100);
     }
 }
 

gcc/predict.def

@@ -118,15 +118,11 @@ DEF_PREDICTOR (PRED_TREE_FPOPCODE, "fp_opcode (on trees)", HITRATE (90), 0)
 /* Branch guarding call is probably taken.  */
 DEF_PREDICTOR (PRED_CALL, "call", HITRATE (67), 0)
 
-/* PRED_CALL is not very reliable predictor and it turns out to be even
-   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 (86), 0)
-DEF_PREDICTOR (PRED_POLYMORPHIC_CALL, "polymorphic call", HITRATE (59), 0)
-
-/* Recursive calls are usually not taken or the function will recurse
-   indefinitely.  */
-DEF_PREDICTOR (PRED_RECURSIVE_CALL, "recursive call", HITRATE (75), 0)
+/* Call predictors are for now ignored, lets leave the predictor
+   to measure its benefit.  */
+DEF_PREDICTOR (PRED_INDIR_CALL, "indirect call", PROB_EVEN, 0)
+DEF_PREDICTOR (PRED_POLYMORPHIC_CALL, "polymorphic call", PROB_EVEN, 0)
+DEF_PREDICTOR (PRED_RECURSIVE_CALL, "recursive call", PROB_EVEN, 0)
 
 /* Branch causing function to terminate is probably not taken.  */
 DEF_PREDICTOR (PRED_TREE_EARLY_RETURN, "early return (on trees)", HITRATE (66),