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diff graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/snippets/CheckCastSnippets.java @ 7368:f04a5e46cdd2

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new facility to add branch probabilities for snippets, probabilities for frequently-used snippets
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 14 Jan 2013 16:29:08 +0100
parents 2912b72d840a
children 4cc0efe5cffe
line wrap: on
line diff
--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/snippets/CheckCastSnippets.java	Mon Jan 14 15:23:13 2013 +0100
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/snippets/CheckCastSnippets.java	Mon Jan 14 16:29:08 2013 +0100
@@ -25,6 +25,7 @@
 import static com.oracle.graal.hotspot.snippets.HotSpotSnippetUtils.*;
 import static com.oracle.graal.snippets.SnippetTemplate.*;
 import static com.oracle.graal.snippets.SnippetTemplate.Arguments.*;
+import static com.oracle.graal.snippets.nodes.BranchProbabilityNode.*;
 
 import com.oracle.graal.api.code.*;
 import com.oracle.graal.api.meta.*;
@@ -68,11 +69,13 @@
                     @Parameter("exactHub") Word exactHub,
                     @ConstantParameter("checkNull") boolean checkNull) {
         if (checkNull && object == null) {
+            probability(0.1);
             isNull.inc();
             return object;
         }
         Word objectHub = loadHub(object);
         if (objectHub != exactHub) {
+            probability(0.01);
             exactMiss.inc();
             //bkpt(object, exactHub, objectHub);
             DeoptimizeNode.deopt(DeoptimizationAction.InvalidateReprofile, DeoptimizationReason.ClassCastException);