235           return replaceInstUsesWith(EI, UndefValue::get(EI.getType()));  in visitExtractElementInst()
303   if (isa<UndefValue>(V)) {  in collectSingleShuffleElements()
304     Mask.assign(NumElts, UndefValue::get(Type::getInt32Ty(V->getContext())));  in collectSingleShuffleElements()
331     if (isa<UndefValue>(ScalarOp)) {  // inserting undef into vector.  in collectSingleShuffleElements()
336         Mask[InsertedIdx] = UndefValue::get(Type::getInt32Ty(V->getContext()));  in collectSingleShuffleElements()
396     ExtendMask.push_back(UndefValue::get(IntType));  in replaceExtractElements()
416   auto *WideVec = new ShuffleVectorInst(ExtVecOp, UndefValue::get(ExtVecType),  in replaceExtractElements()
457   if (isa<UndefValue>(V)) {  in collectShuffleElements()
458     Mask.assign(NumElts, UndefValue::get(Type::getInt32Ty(V->getContext())));  in collectShuffleElements()
460         PermittedRHS ? UndefValue::get(PermittedRHS->getType()) : V, nullptr);  in collectShuffleElements()
575   if (isa<UndefValue>(ScalarOp) || isa<UndefValue>(IdxOp))  in visitInsertElementInst()
593         return replaceInstUsesWith(IE, UndefValue::get(IE.getType()));  in visitInsertElementInst()
611             LR.second = UndefValue::get(LR.first->getType());  in visitInsertElementInst()
790   if (isa<UndefValue>(V)) {  in EvaluateInDifferentElementOrder()
791     return UndefValue::get(VectorType::get(V->getType()->getScalarType(),  in EvaluateInDifferentElementOrder()
803         MaskValues.push_back(UndefValue::get(Builder->getInt32Ty()));  in EvaluateInDifferentElementOrder()
807     return ConstantExpr::getShuffleVector(C, UndefValue::get(C->getType()),  in EvaluateInDifferentElementOrder()
928   if (isa<UndefValue>(SVI.getOperand(2)))  in visitShuffleVectorInst()
929     return replaceInstUsesWith(SVI, UndefValue::get(SVI.getType()));  in visitShuffleVectorInst()
947   if (LHS == RHS || isa<UndefValue>(LHS)) {  in visitShuffleVectorInst()
948     if (isa<UndefValue>(LHS) && LHS == RHS) {  in visitShuffleVectorInst()
951                       ? LHS : UndefValue::get(SVI.getType());  in visitShuffleVectorInst()
959         Elts.push_back(UndefValue::get(Int32Ty));  in visitShuffleVectorInst()
963       if ((Mask[i] >= (int)e && isa<UndefValue>(RHS)) ||  in visitShuffleVectorInst()
964           (Mask[i] <  (int)e && isa<UndefValue>(LHS))) {  in visitShuffleVectorInst()
966         Elts.push_back(UndefValue::get(Int32Ty));  in visitShuffleVectorInst()
973     SVI.setOperand(1, UndefValue::get(RHS->getType()));  in visitShuffleVectorInst()
990   if (isa<UndefValue>(RHS) && CanEvaluateShuffled(LHS, Mask)) {  in visitShuffleVectorInst()
1057                                                 UndefValue::get(Int32Ty));  in visitShuffleVectorInst()
1060         V = Builder->CreateShuffleVector(V, UndefValue::get(V->getType()),  in visitShuffleVectorInst()
1130     if (!isa<UndefValue>(LHSShuffle->getOperand(1)) && !isa<UndefValue>(RHS))  in visitShuffleVectorInst()
1133     if (!isa<UndefValue>(RHSShuffle->getOperand(1)))  in visitShuffleVectorInst()
1156     if (isa<UndefValue>(RHS)) {  in visitShuffleVectorInst()
1205         if (eltMask >= (int)LHSOp0Width && isa<UndefValue>(LHSOp1))  in visitShuffleVectorInst()
1214       if (isa<UndefValue>(RHS))  in visitShuffleVectorInst()
1223           assert(isa<UndefValue>(RHSShuffle->getOperand(1))  in visitShuffleVectorInst()
1256         Elts.push_back(UndefValue::get(Int32Ty));  in visitShuffleVectorInst()
1262       newRHS = UndefValue::get(newLHS->getType());  in visitShuffleVectorInst()