diff --git a/utils/TableGen/CodeGenDAGPatterns.cpp b/utils/TableGen/CodeGenDAGPatterns.cpp
index a0bccfc..878ed09 100644
--- a/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -1057,6 +1057,11 @@
     const CodeGenTarget &T = TP.getDAGPatterns().getTargetInfo();
     return EEVT::TypeSet(T.getRegisterVTs(R));
   }
+
+  if (R->isSubClassOf("SubRegIndex")) {
+    assert(ResNo == 0 && "SubRegisterIndices only produce one result!");
+    return EEVT::TypeSet();
+  }
   
   if (R->isSubClassOf("ValueType") || R->isSubClassOf("CondCode")) {
     assert(ResNo == 0 && "This node only has one result!");