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
@@ -3380,11 +3380,13 @@
         continue;
       Register TrueReg = TRI->lookThruCopyLike(Reg, MRI);
       if (Register::isVirtualRegister(TrueReg)) {
-        DefMI = MRI->getVRegDef(TrueReg);
-        if (DefMI->getOpcode() == PPC::LI || DefMI->getOpcode() == PPC::LI8 ||
-            DefMI->getOpcode() == PPC::ADDI ||
-            DefMI->getOpcode() == PPC::ADDI8) {
+        MachineInstr *DefMIForTrueReg = MRI->getVRegDef(TrueReg);
+        if (DefMIForTrueReg->getOpcode() == PPC::LI ||
+            DefMIForTrueReg->getOpcode() == PPC::LI8 ||
+            DefMIForTrueReg->getOpcode() == PPC::ADDI ||
+            DefMIForTrueReg->getOpcode() == PPC::ADDI8) {
           OpNoForForwarding = i;
+          DefMI = DefMIForTrueReg;
           // The ADDI and LI operand maybe exist in one instruction at same
           // time. we prefer to fold LI operand as LI only has one Imm operand
           // and is more possible to be converted. So if current DefMI is