Index: llvm/lib/CodeGen/TargetInstrInfo.cpp
===================================================================
--- llvm/lib/CodeGen/TargetInstrInfo.cpp
+++ llvm/lib/CodeGen/TargetInstrInfo.cpp
@@ -984,6 +984,11 @@
     // same virtual register, though.
     if (MO.isDef() && Reg != DefReg)
       return false;
+
+    // Do not bother to try rematerializing an instruction with a killed use,
+    // the value of the operand will not be available anyway.
+    if (MO.isKill())
+      return false;
   }
 
   // Everything checked out.