--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/PushNodesThroughPiTest.java	Thu Feb 16 15:46:09 2017 -0800
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.compiler.core.test;
+
+import jdk.vm.ci.meta.ResolvedJavaField;
+import jdk.vm.ci.meta.ResolvedJavaType;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import org.graalvm.compiler.debug.Debug;
+import org.graalvm.compiler.debug.Debug.Scope;
+import org.graalvm.compiler.debug.DebugDumpScope;
+import org.graalvm.compiler.nodes.ParameterNode;
+import org.graalvm.compiler.nodes.PiNode;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
+import org.graalvm.compiler.nodes.calc.IsNullNode;
+import org.graalvm.compiler.nodes.memory.ReadNode;
+import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode;
+import org.graalvm.compiler.nodes.spi.LoweringTool;
+import org.graalvm.compiler.nodes.type.StampTool;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+import org.graalvm.compiler.phases.common.LoweringPhase;
+import org.graalvm.compiler.phases.common.PushThroughPiPhase;
+import org.graalvm.compiler.phases.tiers.PhaseContext;
+
+public class PushNodesThroughPiTest extends GraalCompilerTest {
+
+    public static class A {
+
+        public long x = 20;
+    }
+
+    public static class B extends A {
+
+        public long y = 10;
+    }
+
+    public static class C extends B {
+
+        public long z = 5;
+    }
+
+    public static long test1Snippet(A a) {
+        C c = (C) a;
+        long ret = c.x; // this can be pushed before the checkcast
+        ret += c.y; // not allowed to push
+        ret += c.z; // not allowed to push
+        // the null-check should be canonicalized with the null-check of the checkcast
+        ret += c != null ? 100 : 200;
+        return ret;
+    }
+
+    @Test
+    @SuppressWarnings("try")
+    public void test1() {
+        final String snippet = "test1Snippet";
+        try (Scope s = Debug.scope("PushThroughPi", new DebugDumpScope(snippet))) {
+            StructuredGraph graph = compileTestSnippet(snippet);
+            for (ReadNode rn : graph.getNodes().filter(ReadNode.class)) {
+                OffsetAddressNode address = (OffsetAddressNode) rn.getAddress();
+                long disp = address.getOffset().asJavaConstant().asLong();
+
+                ResolvedJavaType receiverType = StampTool.typeOrNull(address.getBase());
+                ResolvedJavaField field = receiverType.findInstanceFieldWithOffset(disp, rn.getStackKind());
+
+                assert field != null : "Node " + rn + " tries to access a field which doesn't exists for this type";
+                if (field.getName().equals("x")) {
+                    Assert.assertTrue(address.getBase() instanceof ParameterNode);
+                } else {
+                    Assert.assertTrue(address.getBase().toString(), address.getBase() instanceof PiNode);
+                }
+            }
+
+            Assert.assertTrue(graph.getNodes().filter(IsNullNode.class).count() == 1);
+        } catch (Throwable e) {
+            throw Debug.handle(e);
+        }
+    }
+
+    private StructuredGraph compileTestSnippet(final String snippet) {
+        StructuredGraph graph = parseEager(snippet, AllowAssumptions.NO);
+        PhaseContext context = new PhaseContext(getProviders());
+        CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
+        new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
+        canonicalizer.apply(graph, context);
+        new PushThroughPiPhase().apply(graph);
+        canonicalizer.apply(graph, context);
+
+        return graph;
+    }
+}