--- old/src/hotspot/share/gc/g1/g1Predictions.hpp	2019-11-20 17:16:00.028856600 +0100
+++ new/src/hotspot/share/gc/g1/g1Predictions.hpp	2019-11-20 17:15:59.693846231 +0100
@@ -57,6 +57,14 @@
   double get_new_prediction(TruncatedSeq const* seq) const {
     return seq->davg() + _sigma * stddev_estimate(seq);
   }
+
+  double get_new_unit_prediction(TruncatedSeq const* seq) const {
+    return clamp(get_new_prediction(seq), 0.0, 1.0);
+  }
+
+  double get_new_lower_zero_bound_prediction(TruncatedSeq const* seq) const {
+    return MAX2(get_new_prediction(seq), 0.0);
+  }
 };
 
 #endif // SHARE_GC_G1_G1PREDICTIONS_HPP