[X86] Add necessary check isReg() when updating LiveVariables in convertToThreeAddress

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D137388

diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index 4668a35..51fb860 100644 (file)
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -1768,7 +1768,7 @@ MachineInstr *X86InstrInfo::convertToThreeAddress(MachineInstr &MI,
   if (LV) {  // Update live variables
     for (unsigned I = 0; I < NumRegOperands; ++I) {
       MachineOperand &Op = MI.getOperand(I);
-      if (Op.isDead() || Op.isKill())
+      if (Op.isReg() && (Op.isDead() || Op.isKill()))
         LV->replaceKillInstruction(Op.getReg(), MI, *NewMI);
     }
   }