diff --git a/include/llvm/CodeGen/DAGISelHeader.h b/include/llvm/CodeGen/DAGISelHeader.h
index f4514b07fdd..f3eccf0a5ea 100644
--- a/include/llvm/CodeGen/DAGISelHeader.h
+++ b/include/llvm/CodeGen/DAGISelHeader.h
@@ -319,13 +319,11 @@ SDNode *SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
     case OPC_CheckPredicate:
       if (!CheckNodePredicate(N.getNode(), MatcherTable[MatcherIndex++])) break;
       continue;
-    case OPC_CheckComplexPat: {
-      unsigned PatNo = MatcherTable[MatcherIndex++];
-      (void)PatNo;
-      // FIXME: CHECK IT.
+    case OPC_CheckComplexPat:
+      if (!CheckComplexPattern(NodeToMatch, N, 
+                               MatcherTable[MatcherIndex++], RecordedNodes))
+        break;
       continue;
-    }
-        
     case OPC_CheckOpcode:
       if (N->getOpcode() != MatcherTable[MatcherIndex++]) break;
       continue;
diff --git a/include/llvm/CodeGen/SelectionDAGISel.h b/include/llvm/CodeGen/SelectionDAGISel.h
index 0be91b414d0..1b9c2686050 100644
--- a/include/llvm/CodeGen/SelectionDAGISel.h
+++ b/include/llvm/CodeGen/SelectionDAGISel.h
@@ -131,6 +131,12 @@ protected:
     return 0;
   }
   
+  virtual bool CheckComplexPattern(SDNode *Root, SDValue N, unsigned PatternNo,
+                                   SmallVectorImpl<SDValue> &Result) {
+    assert(0 && "Tblgen should generate the implementation of this!");
+    return false;
+  }
+  
   // Calls to these functions are generated by tblgen.
   SDNode *Select_INLINEASM(SDNode *N);
   SDNode *Select_UNDEF(SDNode *N);