diff --git a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
--- a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -986,8 +986,6 @@
     }
 
     Type *Ty = U->getType();
-    Type *OpTy =
-      U->getNumOperands() == 1 ? U->getOperand(0)->getType() : nullptr;
     unsigned Opcode = Operator::getOpcode(U);
     auto *I = dyn_cast<Instruction>(U);
     switch (Opcode) {
@@ -1059,9 +1057,11 @@
     case Instruction::FPExt:
     case Instruction::SExt:
     case Instruction::ZExt:
-    case Instruction::AddrSpaceCast:
+    case Instruction::AddrSpaceCast: {
+      Type *OpTy = U->getOperand(0)->getType();
       return TargetTTI->getCastInstrCost(
           Opcode, Ty, OpTy, TTI::getCastContextHint(I), CostKind, I);
+    }
     case Instruction::Store: {
       auto *SI = cast<StoreInst>(U);
       Type *ValTy = U->getOperand(0)->getType();