diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -3390,7 +3390,8 @@
           // ADDI/ADDI8, we continue to find possible LI/LI8.
           if (DefMI->getOpcode() == PPC::LI || DefMI->getOpcode() == PPC::LI8)
             break;
-        }
+        } else
+          DefMI = nullptr;
       }
     }
   } else {
@@ -3423,7 +3424,7 @@
       if (MO.isReg() && MO.isUse() && !MO.isImplicit()) {
         Register Reg = MI.getOperand(i).getReg();
         // If we see another use of this reg between the def and the MI,
-        // we want to flat it so the def isn't deleted.
+        // we want to flag it so the def isn't deleted.
         MachineInstr *DefMI = getDefMIPostRA(Reg, MI, SeenIntermediateUse);
         if (DefMI) {
           // Is this register defined by some form of add-immediate (including