diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp
index 6b1a59b..9b5d13b 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -169,8 +169,8 @@
   } else {
     // For others, e.g. fallthrough, conditional branch, assume the exit
     // uses all the registers.
-    for (int i = 0, e = TRI->getNumRegs(); i != e; ++i)
-      Uses[i].push_back(&ExitSU);
+    // FIXME: This causes too much compile time regression. We need to compute
+    // liveout instead.
   }
 }