355   if (isa<UndefValue>(V)) {  in ConstantFoldCastInstruction()
362     return UndefValue::get(DestTy);  in ConstantFoldCastInstruction()
543       } else if (isa<UndefValue>(Cond)) {  in ConstantFoldSelectInstruction()
544         V = isa<UndefValue>(V1Element) ? V1Element : V2Element;  in ConstantFoldSelectInstruction()
560   if (isa<UndefValue>(Cond)) {  in ConstantFoldSelectInstruction()
561     if (isa<UndefValue>(V1)) return V1;  in ConstantFoldSelectInstruction()
593   if (isa<UndefValue>(V1) && NotPoison(V2)) return V2;  in ConstantFoldSelectInstruction()
594   if (isa<UndefValue>(V2) && NotPoison(V1)) return V1;  in ConstantFoldSelectInstruction()
616   if (isa<PoisonValue>(Val) || isa<UndefValue>(Idx))  in ConstantFoldExtractElementInstruction()
620   if (isa<UndefValue>(Val))  in ConstantFoldExtractElementInstruction()
621     return UndefValue::get(ValVTy->getElementType());  in ConstantFoldExtractElementInstruction()
677   if (isa<UndefValue>(Idx))  in ConstantFoldInsertElementInstruction()
726     return UndefValue::get(VectorType::get(EltTy, MaskEltCount));  in ConstantFoldShuffleVectorInstruction()
754       Result.push_back(UndefValue::get(EltTy));  in ConstantFoldShuffleVectorInstruction()
759       InElt = UndefValue::get(EltTy);  in ConstantFoldShuffleVectorInstruction()
823       (!C->getType()->isVectorTy() || IsScalableVector) && isa<UndefValue>(C);  in ConstantFoldUnaryInstruction()
898       (isa<UndefValue>(C1) || isa<UndefValue>(C2));  in ConstantFoldBinaryInstruction()
902       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
909       return UndefValue::get(C1->getType());  in ConstantFoldBinaryInstruction()
911       if (isa<UndefValue>(C1) && isa<UndefValue>(C2)) // undef & undef -> undef  in ConstantFoldBinaryInstruction()
916       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
922           return UndefValue::get(C1->getType());  in ConstantFoldBinaryInstruction()
947       if (isa<UndefValue>(C1) && isa<UndefValue>(C2)) // undef | undef -> undef  in ConstantFoldBinaryInstruction()
952       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
961       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
971       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
980       if (match(C1, m_NegZeroFP()) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
988       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
1601   if (isa<UndefValue>(C1) || isa<UndefValue>(C2)) {  in ConstantFoldCompareInstruction()
1607       return UndefValue::get(ResultTy);  in ConstantFoldCompareInstruction()
2043   if (isa<UndefValue>(C))  in ConstantFoldGetElementPtr()
2045     return InBounds ? PoisonValue::get(GEPTy) : UndefValue::get(GEPTy);  in ConstantFoldGetElementPtr()
2055       return IdxC->isNullValue() || isa<UndefValue>(IdxC);  in ConstantFoldGetElementPtr()
2067       if (!isa<UndefValue>(Idx) && !cast<Constant>(Idx)->isNullValue()) {  in ConstantFoldGetElementPtr()