diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp
index d0dc799..12ca95f 100644
--- a/utils/TableGen/DAGISelEmitter.cpp
+++ b/utils/TableGen/DAGISelEmitter.cpp
@@ -462,7 +462,9 @@
     // Pattern fragment types will be resolved when they are inlined.
     return MVT::isUnknown;
   } else if (R->isSubClassOf("Register")) {
-    assert(0 && "Explicit registers not handled here yet!\n");
+    //const CodeGenTarget &T = TP.getDAGISelEmitter().getTargetInfo();
+    // TODO: if a register appears in exactly one regclass, we could use that
+    // type info.
     return MVT::isUnknown;
   } else if (R->isSubClassOf("ValueType")) {
     // Using a VTSDNode.