--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/memory/FloatingReadNode.java	2016-12-09 00:55:54.424288593 -0800
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2011, 2016, 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.nodes.memory;
+
+import static org.graalvm.compiler.nodeinfo.InputType.Memory;
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
+
+import org.graalvm.compiler.core.common.LIRKind;
+import org.graalvm.compiler.core.common.LocationIdentity;
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.debug.DebugCloseable;
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.Canonicalizable;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.PiNode;
+import org.graalvm.compiler.nodes.ValueNodeUtil;
+import org.graalvm.compiler.nodes.extended.GuardingNode;
+import org.graalvm.compiler.nodes.memory.address.AddressNode;
+import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode;
+import org.graalvm.compiler.nodes.spi.LIRLowerable;
+import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+
+/**
+ * A floating read of a value from memory specified in terms of an object base and an object
+ * relative location. This node does not null check the object.
+ */
+@NodeInfo(nameTemplate = "Read#{p#location/s}", cycles = CYCLES_2, size = SIZE_1)
+public final class FloatingReadNode extends FloatingAccessNode implements LIRLowerable, Canonicalizable {
+    public static final NodeClass<FloatingReadNode> TYPE = NodeClass.create(FloatingReadNode.class);
+
+    @OptionalInput(Memory) MemoryNode lastLocationAccess;
+
+    public FloatingReadNode(AddressNode address, LocationIdentity location, MemoryNode lastLocationAccess, Stamp stamp) {
+        this(address, location, lastLocationAccess, stamp, null, BarrierType.NONE);
+    }
+
+    public FloatingReadNode(AddressNode address, LocationIdentity location, MemoryNode lastLocationAccess, Stamp stamp, GuardingNode guard) {
+        this(address, location, lastLocationAccess, stamp, guard, BarrierType.NONE);
+    }
+
+    public FloatingReadNode(AddressNode address, LocationIdentity location, MemoryNode lastLocationAccess, Stamp stamp, GuardingNode guard, BarrierType barrierType) {
+        super(TYPE, address, location, stamp, guard, barrierType);
+        this.lastLocationAccess = lastLocationAccess;
+    }
+
+    @Override
+    public MemoryNode getLastLocationAccess() {
+        return lastLocationAccess;
+    }
+
+    @Override
+    public void setLastLocationAccess(MemoryNode newlla) {
+        updateUsages(ValueNodeUtil.asNode(lastLocationAccess), ValueNodeUtil.asNode(newlla));
+        lastLocationAccess = newlla;
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool gen) {
+        LIRKind readKind = gen.getLIRGeneratorTool().getLIRKind(stamp());
+        gen.setResult(this, gen.getLIRGeneratorTool().getArithmetic().emitLoad(readKind, gen.operand(address), null));
+    }
+
+    @Override
+    public Node canonical(CanonicalizerTool tool) {
+        if (getAddress() instanceof OffsetAddressNode) {
+            OffsetAddressNode objAddress = (OffsetAddressNode) getAddress();
+            if (objAddress.getBase() instanceof PiNode) {
+                PiNode piBase = (PiNode) objAddress.getBase();
+                /*
+                 * If the Pi and the read have the same guard or the read is unguarded, use the
+                 * guard of the Pi along with the original value. This encourages a canonical form
+                 * guarded reads.
+                 */
+                if (piBase.getGuard() == getGuard() || getGuard() == null) {
+                    OffsetAddressNode newAddress = new OffsetAddressNode(piBase.getOriginalNode(), objAddress.getOffset());
+                    return new FloatingReadNode(newAddress, getLocationIdentity(), getLastLocationAccess(), stamp(), getGuard() == null ? piBase.getGuard() : getGuard(), getBarrierType());
+                }
+            }
+        }
+        return ReadNode.canonicalizeRead(this, getAddress(), getLocationIdentity(), tool);
+    }
+
+    @SuppressWarnings("try")
+    @Override
+    public FixedAccessNode asFixedNode() {
+        try (DebugCloseable position = withNodeSourcePosition()) {
+            return graph().add(new ReadNode(getAddress(), getLocationIdentity(), stamp(), getGuard(), getBarrierType()));
+        }
+    }
+
+    @Override
+    public boolean verify() {
+        MemoryNode lla = getLastLocationAccess();
+        assert lla != null || getLocationIdentity().isImmutable() : "lastLocationAccess of " + this + " shouldn't be null for mutable location identity " + getLocationIdentity();
+        return super.verify();
+    }
+}