357   if (isa<UndefValue>(V)) {  in ConstantFoldCastInstruction()
364     return UndefValue::get(DestTy);  in ConstantFoldCastInstruction()
551       } else if (isa<UndefValue>(Cond)) {  in ConstantFoldSelectInstruction()
552         V = isa<UndefValue>(V1Element) ? V1Element : V2Element;  in ConstantFoldSelectInstruction()
568   if (isa<UndefValue>(Cond)) {  in ConstantFoldSelectInstruction()
569     if (isa<UndefValue>(V1)) return V1;  in ConstantFoldSelectInstruction()
601   if (isa<UndefValue>(V1) && NotPoison(V2)) return V2;  in ConstantFoldSelectInstruction()
602   if (isa<UndefValue>(V2) && NotPoison(V1)) return V1;  in ConstantFoldSelectInstruction()
624   if (isa<PoisonValue>(Val) || isa<UndefValue>(Idx))  in ConstantFoldExtractElementInstruction()
628   if (isa<UndefValue>(Val))  in ConstantFoldExtractElementInstruction()
629     return UndefValue::get(ValVTy->getElementType());  in ConstantFoldExtractElementInstruction()
682   if (isa<UndefValue>(Idx))  in ConstantFoldInsertElementInstruction()
726     return UndefValue::get(FixedVectorType::get(EltTy, MaskNumElts));  in ConstantFoldShuffleVectorInstruction()
750       Result.push_back(UndefValue::get(EltTy));  in ConstantFoldShuffleVectorInstruction()
755       InElt = UndefValue::get(EltTy);  in ConstantFoldShuffleVectorInstruction()
819       (!C->getType()->isVectorTy() || IsScalableVector) && isa<UndefValue>(C);  in ConstantFoldUnaryInstruction()
894       (isa<UndefValue>(C1) || isa<UndefValue>(C2));  in ConstantFoldBinaryInstruction()
898       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
905       return UndefValue::get(C1->getType());  in ConstantFoldBinaryInstruction()
907       if (isa<UndefValue>(C1) && isa<UndefValue>(C2)) // undef & undef -> undef  in ConstantFoldBinaryInstruction()
912       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
918           return UndefValue::get(C1->getType());  in ConstantFoldBinaryInstruction()
943       if (isa<UndefValue>(C1) && isa<UndefValue>(C2)) // undef | undef -> undef  in ConstantFoldBinaryInstruction()
948       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
957       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
967       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
976       if (match(C1, m_NegZeroFP()) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
984       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
1720   if (isa<UndefValue>(C1) || isa<UndefValue>(C2)) {  in ConstantFoldCompareInstruction()
1727       return UndefValue::get(ResultTy);  in ConstantFoldCompareInstruction()
2209   if (isa<UndefValue>(C))  in ConstantFoldGetElementPtr()
2211     return InBounds ? PoisonValue::get(GEPTy) : UndefValue::get(GEPTy);  in ConstantFoldGetElementPtr()
2214   if (Idxs.size() == 1 && (Idx0->isNullValue() || isa<UndefValue>(Idx0)))  in ConstantFoldGetElementPtr()
2223       if (!isa<UndefValue>(Idxs[i]) &&  in ConstantFoldGetElementPtr()