--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/NegateNode.java	2017-03-20 17:40:40.000000000 -0700
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/NegateNode.java	2017-03-20 17:40:40.000000000 -0700
@@ -28,18 +28,20 @@
 import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.UnaryOp.Neg;
 import org.graalvm.compiler.core.common.type.FloatStamp;
+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.gen.ArithmeticLIRGeneratorTool;
 import org.graalvm.compiler.nodeinfo.NodeInfo;
 import org.graalvm.compiler.nodes.ValueNode;
 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+import org.graalvm.compiler.nodes.spi.StampInverter;
 
 /**
  * The {@code NegateNode} node negates its operand.
  */
 @NodeInfo(cycles = CYCLES_2, size = SIZE_1)
-public final class NegateNode extends UnaryArithmeticNode<Neg> implements NarrowableArithmeticNode {
+public final class NegateNode extends UnaryArithmeticNode<Neg> implements NarrowableArithmeticNode, StampInverter {
 
     public static final NodeClass<NegateNode> TYPE = NodeClass.create(NegateNode.class);
 
@@ -67,4 +69,9 @@
     public void generate(NodeLIRBuilderTool nodeValueMap, ArithmeticLIRGeneratorTool gen) {
         nodeValueMap.setResult(this, gen.emitNegate(nodeValueMap.operand(getValue())));
     }
+
+    @Override
+    public Stamp invertStamp(Stamp outStamp) {
+        return getArithmeticOp().foldStamp(outStamp);
+    }
 }