--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64TailcallOp.java	2016-12-09 00:48:53.955754340 -0800
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2011, 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.hotspot.amd64;
+
+import static jdk.vm.ci.code.ValueUtil.asRegister;
+
+import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
+import org.graalvm.compiler.lir.LIRInstructionClass;
+import org.graalvm.compiler.lir.Opcode;
+import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;
+import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
+
+import jdk.vm.ci.code.InstalledCode;
+import jdk.vm.ci.meta.Value;
+
+/**
+ * Performs a hard-coded tail call to the specified target, which normally should be an
+ * {@link InstalledCode} instance.
+ */
+@Opcode("TAILCALL")
+public final class AMD64TailcallOp extends AMD64LIRInstruction {
+    public static final LIRInstructionClass<AMD64TailcallOp> TYPE = LIRInstructionClass.create(AMD64TailcallOp.class);
+
+    @Use protected Value target;
+    @Alive protected Value[] parameters;
+
+    public AMD64TailcallOp(Value[] parameters, Value target) {
+        super(TYPE);
+        this.target = target;
+        this.parameters = parameters;
+    }
+
+    @Override
+    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
+        // destroy the current frame (now the return address is the top of stack)
+        masm.leave();
+
+        // jump to the target method
+        masm.jmp(asRegister(target));
+        masm.ensureUniquePC();
+    }
+}