--- /dev/null	2017-11-16 08:17:56.803999947 +0100
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/IntegerMulHighNode.java	2019-03-09 03:58:07.725524416 +0100
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2014, 2019, 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.calc;
+
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;
+
+import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
+import org.graalvm.compiler.core.common.type.ArithmeticOpTable.BinaryOp.MulHigh;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.Canonicalizable;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
+import org.graalvm.compiler.lir.gen.ArithmeticLIRGeneratorTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.ConstantNode;
+import org.graalvm.compiler.nodes.NodeView;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+
+import jdk.vm.ci.meta.Constant;
+import jdk.vm.ci.meta.PrimitiveConstant;
+import jdk.vm.ci.meta.Value;
+
+@NodeInfo(shortName = "*H", cycles = CYCLES_2, size = SIZE_2)
+public final class IntegerMulHighNode extends BinaryArithmeticNode<MulHigh> implements Canonicalizable.BinaryCommutative<ValueNode> {
+    public static final NodeClass<IntegerMulHighNode> TYPE = NodeClass.create(IntegerMulHighNode.class);
+
+    public IntegerMulHighNode(ValueNode x, ValueNode y) {
+        super(TYPE, ArithmeticOpTable::getMulHigh, x, y);
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool nodeValueMap, ArithmeticLIRGeneratorTool gen) {
+        Value a = nodeValueMap.operand(getX());
+        Value b = nodeValueMap.operand(getY());
+        nodeValueMap.setResult(this, gen.emitMulHigh(a, b));
+    }
+
+    @Override
+    public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
+        ValueNode ret = super.canonical(tool, forX, forY);
+        if (ret != this) {
+            return ret;
+        }
+
+        if (forX.isConstant() && !forY.isConstant()) {
+            // we try to swap and canonicalize
+            ValueNode improvement = canonical(tool, forY, forX);
+            if (improvement != this) {
+                return improvement;
+            }
+            // if this fails we only swap
+            return new IntegerMulHighNode(forY, forX);
+        }
+        return canonical(this, forY);
+    }
+
+    private static ValueNode canonical(IntegerMulHighNode self, ValueNode forY) {
+        if (forY.isConstant()) {
+            Constant c = forY.asConstant();
+            if (c instanceof PrimitiveConstant && ((PrimitiveConstant) c).getJavaKind().isNumericInteger()) {
+                long i = ((PrimitiveConstant) c).asLong();
+                if (i == 0 || i == 1) {
+                    return ConstantNode.forIntegerStamp(self.stamp(NodeView.DEFAULT), 0);
+                }
+            }
+        }
+        return self;
+    }
+}