--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/FixedGuardNode.java	Thu Feb 16 15:46:09 2017 -0800
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2011, 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;
+
+import static org.graalvm.compiler.nodeinfo.InputType.Guard;
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;
+
+import org.graalvm.compiler.graph.IterableNodeType;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.SimplifierTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.extended.ValueAnchorNode;
+import org.graalvm.compiler.nodes.spi.Lowerable;
+import org.graalvm.compiler.nodes.spi.LoweringTool;
+
+import jdk.vm.ci.meta.DeoptimizationAction;
+import jdk.vm.ci.meta.DeoptimizationReason;
+import jdk.vm.ci.meta.JavaConstant;
+
+@NodeInfo(nameTemplate = "FixedGuard(!={p#negated}) {p#reason/s}", allowedUsageTypes = Guard, size = SIZE_2, cycles = CYCLES_2)
+public final class FixedGuardNode extends AbstractFixedGuardNode implements Lowerable, IterableNodeType {
+    public static final NodeClass<FixedGuardNode> TYPE = NodeClass.create(FixedGuardNode.class);
+
+    public FixedGuardNode(LogicNode condition, DeoptimizationReason deoptReason, DeoptimizationAction action) {
+        this(condition, deoptReason, action, JavaConstant.NULL_POINTER, false);
+    }
+
+    public FixedGuardNode(LogicNode condition, DeoptimizationReason deoptReason, DeoptimizationAction action, boolean negated) {
+        this(condition, deoptReason, action, JavaConstant.NULL_POINTER, negated);
+    }
+
+    public FixedGuardNode(LogicNode condition, DeoptimizationReason deoptReason, DeoptimizationAction action, JavaConstant speculation, boolean negated) {
+        super(TYPE, condition, deoptReason, action, speculation, negated);
+    }
+
+    @Override
+    public void simplify(SimplifierTool tool) {
+        super.simplify(tool);
+
+        if (getCondition() instanceof LogicConstantNode) {
+            LogicConstantNode c = (LogicConstantNode) getCondition();
+            if (c.getValue() == isNegated()) {
+                FixedNode currentNext = this.next();
+                if (currentNext != null) {
+                    tool.deleteBranch(currentNext);
+                }
+
+                DeoptimizeNode deopt = graph().add(new DeoptimizeNode(getAction(), getReason(), getSpeculation()));
+                deopt.setStateBefore(stateBefore());
+                setNext(deopt);
+            }
+            this.replaceAtUsages(null);
+            graph().removeFixed(this);
+        } else if (getCondition() instanceof ShortCircuitOrNode) {
+            ShortCircuitOrNode shortCircuitOr = (ShortCircuitOrNode) getCondition();
+            if (isNegated() && hasNoUsages()) {
+                graph().addAfterFixed(this, graph().add(new FixedGuardNode(shortCircuitOr.getY(), getReason(), getAction(), getSpeculation(), !shortCircuitOr.isYNegated())));
+                graph().replaceFixedWithFixed(this, graph().add(new FixedGuardNode(shortCircuitOr.getX(), getReason(), getAction(), getSpeculation(), !shortCircuitOr.isXNegated())));
+            }
+        }
+    }
+
+    @Override
+    public void lower(LoweringTool tool) {
+        if (graph().getGuardsStage().allowsFloatingGuards()) {
+            /*
+             * Don't allow guards with action None and reason RuntimeConstraint to float. In cases
+             * where 2 guards are testing equivalent conditions they might be lowered at the same
+             * location. If the guard with the None action is lowered before the the other guard
+             * then the code will be stuck repeatedly deoptimizing without invalidating the code.
+             * Conditional elimination will eliminate the guard if it's truly redundant in this
+             * case.
+             */
+            if (getAction() != DeoptimizationAction.None || getReason() != DeoptimizationReason.RuntimeConstraint) {
+                ValueNode guard = tool.createGuard(this, getCondition(), getReason(), getAction(), getSpeculation(), isNegated()).asNode();
+                this.replaceAtUsages(guard);
+                ValueAnchorNode newAnchor = graph().add(new ValueAnchorNode(guard.asNode()));
+                graph().replaceFixedWithFixed(this, newAnchor);
+            }
+        } else {
+            lowerToIf().lower(tool);
+        }
+    }
+
+    @Override
+    public boolean canDeoptimize() {
+        return true;
+    }
+}