diff --git a/lib/CodeGen/ScheduleDAGEmit.cpp b/lib/CodeGen/ScheduleDAGEmit.cpp
index 0d15c02..8e03420 100644
--- a/lib/CodeGen/ScheduleDAGEmit.cpp
+++ b/lib/CodeGen/ScheduleDAGEmit.cpp
@@ -50,8 +50,10 @@
           break;
         }
       }
-      TII->copyRegToReg(*BB, InsertPos, Reg, VRI->second,
-                        SU->CopyDstRC, SU->CopySrcRC);
+      bool Success = TII->copyRegToReg(*BB, InsertPos, Reg, VRI->second,
+                                       SU->CopyDstRC, SU->CopySrcRC);
+      (void)Success;
+      assert(Success && "copyRegToReg failed!");
     } else {
       // Copy from physical register.
       assert(I->getReg() && "Unknown physical register!");
@@ -59,8 +61,10 @@
       bool isNew = VRBaseMap.insert(std::make_pair(SU, VRBase)).second;
       isNew = isNew; // Silence compiler warning.
       assert(isNew && "Node emitted out of order - early");
-      TII->copyRegToReg(*BB, InsertPos, VRBase, I->getReg(),
-                        SU->CopyDstRC, SU->CopySrcRC);
+      bool Success = TII->copyRegToReg(*BB, InsertPos, VRBase, I->getReg(),
+                                       SU->CopyDstRC, SU->CopySrcRC);
+      (void)Success;
+      assert(Success && "copyRegToReg failed!");
     }
     break;
   }