diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp
index fc9dea8..597d51d 100644
--- a/lib/CodeGen/MachineCSE.cpp
+++ b/lib/CodeGen/MachineCSE.cpp
@@ -294,8 +294,12 @@
     bool FoundCSE = VNT.count(MI);
     if (!FoundCSE) {
       // Look for trivial copy coalescing opportunities.
-      if (PerformTrivialCoalescing(MI, MBB))
+      if (PerformTrivialCoalescing(MI, MBB)) {
+        // After coalescing MI itself may become a copy.
+        if (isCopy(MI, TII))
+          continue;
         FoundCSE = VNT.count(MI);
+      }
     }
     // FIXME: commute commutable instructions?