diff -r 0152ad7b38b8 -r 6df94ce3ab2f src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/util/SignedIntegerHelper.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/util/SignedIntegerHelper.java	Tue Sep 24 12:47:15 2019 -0400
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2018, 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.util;
+
+import org.graalvm.compiler.core.common.NumUtil;
+import org.graalvm.compiler.core.common.type.IntegerStamp;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.nodes.LogicNode;
+import org.graalvm.compiler.nodes.NodeView;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.calc.IntegerLessThanNode;
+
+import jdk.vm.ci.code.CodeUtil;
+
+public class SignedIntegerHelper extends IntegerHelper {
+    public SignedIntegerHelper(int bits) {
+        super(bits);
+    }
+
+    @Override
+    public long upperBound(IntegerStamp stamp) {
+        assert stamp.getBits() == bits;
+        return stamp.upperBound();
+    }
+
+    @Override
+    public long lowerBound(IntegerStamp stamp) {
+        assert stamp.getBits() == bits;
+        return stamp.lowerBound();
+    }
+
+    @Override
+    protected int rawCompare(long a, long b) {
+        return Long.compare(a, b);
+    }
+
+    @Override
+    protected long rawMin(long a, long b) {
+        return Math.min(a, b);
+    }
+
+    @Override
+    protected long rawMax(long a, long b) {
+        return Math.max(a, b);
+    }
+
+    @Override
+    public long cast(long a) {
+        return CodeUtil.signExtend(a, bits);
+    }
+
+    @Override
+    public long minValue() {
+        return NumUtil.minValue(bits);
+    }
+
+    @Override
+    public long maxValue() {
+        return NumUtil.maxValue(bits);
+    }
+
+    @Override
+    public IntegerStamp stamp(long min, long max) {
+        return StampFactory.forInteger(bits, cast(min), cast(max));
+    }
+
+    @Override
+    public LogicNode createCompareNode(ValueNode x, ValueNode y, NodeView view) {
+        return IntegerLessThanNode.create(x, y, view);
+    }
+}