--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.aarch64/src/org/graalvm/compiler/replacements/aarch64/AArch64CountLeadingZerosNode.java	2017-02-15 17:08:40.711976775 -0800
@@ -0,0 +1,87 @@
+/*
+ * 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.replacements.aarch64;
+
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_6;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
+
+import org.graalvm.compiler.core.common.type.IntegerStamp;
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
+import org.graalvm.compiler.lir.aarch64.AArch64ArithmeticLIRGeneratorTool;
+import org.graalvm.compiler.lir.gen.ArithmeticLIRGeneratorTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.ConstantNode;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.calc.UnaryNode;
+import org.graalvm.compiler.nodes.spi.ArithmeticLIRLowerable;
+import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+import org.graalvm.compiler.nodes.type.StampTool;
+
+import jdk.vm.ci.meta.JavaConstant;
+import jdk.vm.ci.meta.JavaKind;
+
+@NodeInfo(cycles = CYCLES_6, size = SIZE_1)
+public final class AArch64CountLeadingZerosNode extends UnaryNode implements ArithmeticLIRLowerable {
+
+    public static final NodeClass<AArch64CountLeadingZerosNode> TYPE = NodeClass.create(AArch64CountLeadingZerosNode.class);
+
+    public AArch64CountLeadingZerosNode(ValueNode value) {
+        super(TYPE, computeStamp(value.stamp(), value), value);
+    }
+
+    @Override
+    public Stamp foldStamp(Stamp newStamp) {
+        return computeStamp(newStamp, getValue());
+    }
+
+    private static Stamp computeStamp(Stamp newStamp, ValueNode theValue) {
+        assert newStamp.isCompatible(theValue.stamp());
+        assert theValue.getStackKind() == JavaKind.Int || theValue.getStackKind() == JavaKind.Long;
+        return StampTool.stampForLeadingZeros((IntegerStamp) newStamp);
+    }
+
+    public static ValueNode tryFold(ValueNode value) {
+        if (value.isConstant()) {
+            JavaConstant c = value.asJavaConstant();
+            if (value.getStackKind() == JavaKind.Int) {
+                return ConstantNode.forInt(Integer.numberOfLeadingZeros(c.asInt()));
+            } else {
+                return ConstantNode.forInt(Long.numberOfLeadingZeros(c.asLong()));
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
+        ValueNode folded = tryFold(forValue);
+        return folded != null ? folded : this;
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool builder, ArithmeticLIRGeneratorTool gen) {
+        builder.setResult(this, ((AArch64ArithmeticLIRGeneratorTool) gen).emitCountLeadingZeros(builder.operand(getValue())));
+    }
+}