--- /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/calc/IntegerBelowNode.java	2016-12-09 00:55:15.709582101 -0800
@@ -0,0 +1,193 @@
+/*
+ * 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.nodes.calc;
+
+import org.graalvm.compiler.core.common.calc.Condition;
+import org.graalvm.compiler.core.common.type.IntegerStamp;
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.LogicConstantNode;
+import org.graalvm.compiler.nodes.LogicNegationNode;
+import org.graalvm.compiler.nodes.LogicNode;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.util.GraphUtil;
+
+import jdk.vm.ci.code.CodeUtil;
+import jdk.vm.ci.meta.ConstantReflectionProvider;
+import jdk.vm.ci.meta.TriState;
+
+@NodeInfo(shortName = "|<|")
+public final class IntegerBelowNode extends CompareNode {
+    public static final NodeClass<IntegerBelowNode> TYPE = NodeClass.create(IntegerBelowNode.class);
+
+    public IntegerBelowNode(ValueNode x, ValueNode y) {
+        super(TYPE, Condition.BT, false, x, y);
+        assert x.stamp() instanceof IntegerStamp;
+        assert y.stamp() instanceof IntegerStamp;
+    }
+
+    public static LogicNode create(ValueNode x, ValueNode y, ConstantReflectionProvider constantReflection) {
+        LogicNode result = CompareNode.tryConstantFold(Condition.BT, x, y, constantReflection, false);
+        if (result != null) {
+            return result;
+        } else {
+            result = findSynonym(x, y);
+            if (result != null) {
+                return result;
+            }
+            return new IntegerBelowNode(x, y);
+        }
+    }
+
+    @Override
+    public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
+        ValueNode result = super.canonical(tool, forX, forY);
+        if (result != this) {
+            return result;
+        }
+        LogicNode synonym = findSynonym(forX, forY);
+        if (synonym != null) {
+            return synonym;
+        }
+        if (forX.isConstant() && forX.asJavaConstant().asLong() == 0) {
+            // 0 |<| y is the same as 0 != y
+            return LogicNegationNode.create(CompareNode.createCompareNode(Condition.EQ, forX, forY, tool.getConstantReflection()));
+        }
+        return this;
+    }
+
+    private static LogicNode findSynonym(ValueNode forX, ValueNode forY) {
+        if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY)) {
+            return LogicConstantNode.contradiction();
+        } else if (forX.stamp() instanceof IntegerStamp && forY.stamp() instanceof IntegerStamp) {
+            IntegerStamp xStamp = (IntegerStamp) forX.stamp();
+            IntegerStamp yStamp = (IntegerStamp) forY.stamp();
+            if (yStamp.isPositive()) {
+                if (xStamp.isPositive() && xStamp.upperBound() < yStamp.lowerBound()) {
+                    return LogicConstantNode.tautology();
+                } else if (xStamp.isStrictlyNegative() || xStamp.lowerBound() >= yStamp.upperBound()) {
+                    return LogicConstantNode.contradiction();
+                }
+            }
+        }
+        return null;
+    }
+
+    @Override
+    protected CompareNode duplicateModified(ValueNode newX, ValueNode newY) {
+        return new IntegerBelowNode(newX, newY);
+    }
+
+    @Override
+    public Stamp getSucceedingStampForX(boolean negated) {
+        Stamp xStampGeneric = getX().stamp();
+        Stamp yStampGeneric = getY().stamp();
+        if (xStampGeneric instanceof IntegerStamp) {
+            IntegerStamp xStamp = (IntegerStamp) xStampGeneric;
+            int bits = xStamp.getBits();
+            if (yStampGeneric instanceof IntegerStamp) {
+                IntegerStamp yStamp = (IntegerStamp) yStampGeneric;
+                assert yStamp.getBits() == bits;
+                if (negated) {
+                    // x >= y
+                    if (xStamp.isPositive() && yStamp.isPositive()) {
+                        long xLowerBound = xStamp.lowerBound();
+                        long yLowerBound = yStamp.lowerBound();
+                        if (yLowerBound > xLowerBound) {
+                            return StampFactory.forIntegerWithMask(bits, yLowerBound, xStamp.upperBound(), xStamp);
+                        }
+                    }
+                } else {
+                    // x < y
+                    if (yStamp.isStrictlyPositive()) {
+                        // x >= 0 && x < y
+                        long xUpperBound = xStamp.upperBound();
+                        long yUpperBound = yStamp.upperBound();
+                        if (yUpperBound <= xUpperBound || !xStamp.isPositive()) {
+                            return StampFactory.forIntegerWithMask(bits, Math.max(0, xStamp.lowerBound()), Math.min(xUpperBound, yUpperBound - 1), xStamp);
+                        }
+                    }
+                }
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Stamp getSucceedingStampForY(boolean negated) {
+        Stamp xStampGeneric = getX().stamp();
+        Stamp yStampGeneric = getY().stamp();
+        if (xStampGeneric instanceof IntegerStamp) {
+            IntegerStamp xStamp = (IntegerStamp) xStampGeneric;
+            int bits = xStamp.getBits();
+            if (yStampGeneric instanceof IntegerStamp) {
+                IntegerStamp yStamp = (IntegerStamp) yStampGeneric;
+                assert yStamp.getBits() == bits;
+                if (negated) {
+                    // y <= x
+                    if (xStamp.isPositive()) {
+                        long xUpperBound = xStamp.upperBound();
+                        long yUpperBound = yStamp.upperBound();
+                        if (xUpperBound < yUpperBound || !yStamp.isPositive()) {
+                            return StampFactory.forIntegerWithMask(bits, Math.max(0, yStamp.lowerBound()), Math.min(xUpperBound, yUpperBound), yStamp);
+                        }
+                    }
+                } else {
+                    // y > x
+                    if (xStamp.isPositive() && yStamp.isPositive()) {
+                        long xLowerBound = xStamp.lowerBound();
+                        long yLowerBound = yStamp.lowerBound();
+                        if (xLowerBound == CodeUtil.maxValue(bits)) {
+                            return null;
+                        } else if (xLowerBound >= yLowerBound) {
+                            assert xLowerBound != CodeUtil.maxValue(bits);
+                            return StampFactory.forIntegerWithMask(bits, xLowerBound + 1, yStamp.upperBound(), yStamp);
+                        }
+                    }
+                }
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public TriState tryFold(Stamp xStampGeneric, Stamp yStampGeneric) {
+        if (xStampGeneric instanceof IntegerStamp) {
+            IntegerStamp xStamp = (IntegerStamp) xStampGeneric;
+            if (yStampGeneric instanceof IntegerStamp) {
+                IntegerStamp yStamp = (IntegerStamp) yStampGeneric;
+                if (yStamp.isPositive()) {
+                    if (xStamp.isPositive() && xStamp.upperBound() < yStamp.lowerBound()) {
+                        return TriState.TRUE;
+                    } else if (xStamp.isStrictlyNegative() || xStamp.lowerBound() >= yStamp.upperBound()) {
+                        return TriState.FALSE;
+                    }
+                }
+            }
+        }
+        return TriState.UNKNOWN;
+    }
+}