339           return replaceInstUsesWith(EI, UndefValue::get(EI.getType()));  in visitExtractElementInst()
373   if (isa<UndefValue>(V)) {  in collectSingleShuffleElements()
374     Mask.assign(NumElts, UndefValue::get(Type::getInt32Ty(V->getContext())));  in collectSingleShuffleElements()
401     if (isa<UndefValue>(ScalarOp)) {  // inserting undef into vector.  in collectSingleShuffleElements()
406         Mask[InsertedIdx] = UndefValue::get(Type::getInt32Ty(V->getContext()));  in collectSingleShuffleElements()
466     ExtendMask.push_back(UndefValue::get(IntType));  in replaceExtractElements()
494   auto *WideVec = new ShuffleVectorInst(ExtVecOp, UndefValue::get(ExtVecType),  in replaceExtractElements()
535   if (isa<UndefValue>(V)) {  in collectShuffleElements()
536     Mask.assign(NumElts, UndefValue::get(Type::getInt32Ty(V->getContext())));  in collectShuffleElements()
538         PermittedRHS ? UndefValue::get(PermittedRHS->getType()) : V, nullptr);  in collectShuffleElements()
719         UndefValue::get(VT), SplatVal,  in foldInsSequenceIntoBroadcast()
726   return new ShuffleVectorInst(InsertFirst, UndefValue::get(VT), ZeroMask);  in foldInsSequenceIntoBroadcast()
845         Values[I] = UndefValue::get(InsElt.getType()->getElementType());  in foldConstantInsEltIntoShuffle()
868   if (isa<UndefValue>(ScalarOp) || isa<UndefValue>(IdxOp))  in visitInsertElementInst()
884       return replaceInstUsesWith(IE, UndefValue::get(IE.getType()));  in visitInsertElementInst()
924           LR.second = UndefValue::get(LR.first->getType());  in visitInsertElementInst()
1121   if (isa<UndefValue>(V))  in evaluateInDifferentElementOrder()
1122     return UndefValue::get(VectorType::get(EltTy, Mask.size()));  in evaluateInDifferentElementOrder()
1131         MaskValues.push_back(UndefValue::get(I32Ty));  in evaluateInDifferentElementOrder()
1135     return ConstantExpr::getShuffleVector(C, UndefValue::get(C->getType()),  in evaluateInDifferentElementOrder()
1485   Value *Undef = UndefValue::get(X->getType());  in narrowVectorSelect()
1494   if (!Shuf.isIdentityWithExtract() || !isa<UndefValue>(Op1))  in foldIdentityExtractShuffle()
1521     NewMask[i] = isa<UndefValue>(ExtractMaskElt) ? ExtractMaskElt : MaskElt;  in foldIdentityExtractShuffle()
1628   if (LHS == RHS || isa<UndefValue>(LHS)) {  in visitShuffleVectorInst()
1633         Elts.push_back(UndefValue::get(Int32Ty));  in visitShuffleVectorInst()
1637       if ((Mask[i] >= (int)e && isa<UndefValue>(RHS)) ||  in visitShuffleVectorInst()
1638           (Mask[i] <  (int)e && isa<UndefValue>(LHS))) {  in visitShuffleVectorInst()
1640         Elts.push_back(UndefValue::get(Int32Ty));  in visitShuffleVectorInst()
1647     SVI.setOperand(1, UndefValue::get(RHS->getType()));  in visitShuffleVectorInst()
1664   if (isa<UndefValue>(RHS) && canEvaluateShuffled(LHS, Mask)) {  in visitShuffleVectorInst()
1731                                                 UndefValue::get(Int32Ty));  in visitShuffleVectorInst()
1734         V = Builder.CreateShuffleVector(V, UndefValue::get(V->getType()),  in visitShuffleVectorInst()
1804     if (!isa<UndefValue>(LHSShuffle->getOperand(1)) && !isa<UndefValue>(RHS))  in visitShuffleVectorInst()
1807     if (!isa<UndefValue>(RHSShuffle->getOperand(1)))  in visitShuffleVectorInst()
1830     if (isa<UndefValue>(RHS)) {  in visitShuffleVectorInst()
1879         if (eltMask >= (int)LHSOp0Width && isa<UndefValue>(LHSOp1))  in visitShuffleVectorInst()
1888       if (isa<UndefValue>(RHS))  in visitShuffleVectorInst()
1897           assert(isa<UndefValue>(RHSShuffle->getOperand(1))  in visitShuffleVectorInst()
1930         Elts.push_back(UndefValue::get(Int32Ty));  in visitShuffleVectorInst()
1936       newRHS = UndefValue::get(newLHS->getType());  in visitShuffleVectorInst()