diff --git a/Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp b/Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp
index d137a07..3aa991c 100644
--- a/Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp
+++ b/Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp
@@ -70,14 +70,40 @@
     {
         switch (m_node->op()) {
         case BitOr:
-            // Optimize X|0 -> X.
+            if (m_node->child1()->isConstant()) {
+                JSValue op1 = m_graph.valueOfJSConstant(m_node->child1().node());
+                if (op1.isInt32() && !op1.asInt32()) {
+                    convertToIdentityOverChild2();
+                    break;
+                }
+            }
             if (m_node->child2()->isConstant()) {
-                JSValue C2 = m_graph.valueOfJSConstant(m_node->child2().node());
-                if (C2.isInt32() && !C2.asInt32()) {
-                    m_insertionSet.insertNode(
-                        m_nodeIndex, SpecNone, Phantom, m_node->codeOrigin,
-                        m_node->child2());
-                    m_node->children.removeEdge(1);
+                JSValue op2 = m_graph.valueOfJSConstant(m_node->child2().node());
+                if (op2.isInt32() && !op2.asInt32()) {
+                    convertToIdentityOverChild1();
+                    break;
+                }
+            }
+            break;
+            
+        case BitLShift:
+        case BitRShift:
+        case BitURShift:
+            if (m_node->child2()->isConstant()) {
+                JSValue op2 = m_graph.valueOfJSConstant(m_node->child2().node());
+                if (op2.isInt32() && !(op2.asInt32() & 0x1f)) {
+                    convertToIdentityOverChild1();
+                    break;
+                }
+            }
+            break;
+            
+        case UInt32ToNumber:
+            if (m_node->child1()->op() == BitURShift
+                && m_node->child1()->child2()->isConstant()) {
+                JSValue shiftAmount = m_graph.valueOfJSConstant(
+                    m_node->child1()->child2().node());
+                if (shiftAmount.isInt32() && (shiftAmount.asInt32() & 0x1f)) {
                     m_node->convertToIdentity();
                     m_changed = true;
                     break;
@@ -116,6 +142,25 @@
             break;
         }
     }
+            
+    void convertToIdentityOverChild(unsigned childIndex)
+    {
+        m_insertionSet.insertNode(
+            m_nodeIndex, SpecNone, Phantom, m_node->codeOrigin, m_node->children);
+        m_node->children.removeEdge(childIndex ^ 1);
+        m_node->convertToIdentity();
+        m_changed = true;
+    }
+    
+    void convertToIdentityOverChild1()
+    {
+        convertToIdentityOverChild(0);
+    }
+    
+    void convertToIdentityOverChild2()
+    {
+        convertToIdentityOverChild(1);
+    }
     
     void foldTypedArrayPropertyToConstant(JSArrayBufferView* view, JSValue constant)
     {