diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp
index 3ceefe7..ce86e9c 100644
--- a/lib/Target/X86/InstSelectSimple.cpp
+++ b/lib/Target/X86/InstSelectSimple.cpp
@@ -1691,7 +1691,8 @@
         BuildMI(BB, X86::IN32, 0);
         break;
       default:
-        assert (0 && "Cannot do input on this data type");
+        std::cerr << "Cannot do input on this data type";
+        exit (1);
     }
     return;
 
@@ -1725,7 +1726,8 @@
         BuildMI(BB, X86::OUT32, 0);
         break;
       default:
-        assert (0 && "Cannot do input on this data type");
+        std::cerr << "Cannot do output on this data type";
+        exit (1);
     }
     return;
 
diff --git a/lib/Target/X86/X86ISelSimple.cpp b/lib/Target/X86/X86ISelSimple.cpp
index 3ceefe7..ce86e9c 100644
--- a/lib/Target/X86/X86ISelSimple.cpp
+++ b/lib/Target/X86/X86ISelSimple.cpp
@@ -1691,7 +1691,8 @@
         BuildMI(BB, X86::IN32, 0);
         break;
       default:
-        assert (0 && "Cannot do input on this data type");
+        std::cerr << "Cannot do input on this data type";
+        exit (1);
     }
     return;
 
@@ -1725,7 +1726,8 @@
         BuildMI(BB, X86::OUT32, 0);
         break;
       default:
-        assert (0 && "Cannot do input on this data type");
+        std::cerr << "Cannot do output on this data type";
+        exit (1);
     }
     return;