--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements/src/org/graalvm/compiler/replacements/nodes/ReadRegisterNode.java	2017-02-15 17:09:18.807644666 -0800
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2012, 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.replacements.nodes;
+
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_1;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
+
+import org.graalvm.compiler.core.common.LIRKind;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodeinfo.Verbosity;
+import org.graalvm.compiler.nodes.FixedWithNextNode;
+import org.graalvm.compiler.nodes.spi.LIRLowerable;
+import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+
+import jdk.vm.ci.code.Register;
+import jdk.vm.ci.meta.JavaKind;
+import jdk.vm.ci.meta.Value;
+
+/**
+ * Access the value of a specific register.
+ */
+@NodeInfo(nameTemplate = "ReadRegister %{p#register}", cycles = CYCLES_1, size = SIZE_1)
+public final class ReadRegisterNode extends FixedWithNextNode implements LIRLowerable {
+
+    public static final NodeClass<ReadRegisterNode> TYPE = NodeClass.create(ReadRegisterNode.class);
+    /**
+     * The fixed register to access.
+     */
+    protected final Register register;
+
+    /**
+     * When true, subsequent uses of this node use the fixed register; when false, the value is
+     * moved into a new virtual register so that the fixed register is not seen by uses.
+     */
+    protected final boolean directUse;
+
+    /**
+     * When true, this node is also an implicit definition of the value for the register allocator,
+     * i.e., the register is an implicit incoming value; when false, the register must be defined in
+     * the same method or must be an register excluded from register allocation.
+     */
+    protected final boolean incoming;
+
+    public ReadRegisterNode(Register register, JavaKind kind, boolean directUse, boolean incoming) {
+        super(TYPE, StampFactory.forKind(kind));
+        assert register != null;
+        this.register = register;
+        this.directUse = directUse;
+        this.incoming = incoming;
+    }
+
+    public ReadRegisterNode(Register register, boolean directUse, boolean incoming) {
+        super(TYPE, StampFactory.forNodeIntrinsic());
+        assert register != null;
+        this.register = register;
+        this.directUse = directUse;
+        this.incoming = incoming;
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool generator) {
+        LIRKind kind = generator.getLIRGeneratorTool().getLIRKind(stamp());
+        Value result = register.asValue(kind);
+        if (incoming) {
+            generator.getLIRGeneratorTool().emitIncomingValues(new Value[]{result});
+        }
+        if (!directUse) {
+            result = generator.getLIRGeneratorTool().emitMove(result);
+        }
+        generator.setResult(this, result);
+    }
+
+    @Override
+    public String toString(Verbosity verbosity) {
+        if (verbosity == Verbosity.Name) {
+            return super.toString(Verbosity.Name) + "%" + register;
+        } else {
+            return super.toString(verbosity);
+        }
+    }
+}