521   if (isa<UndefValue>(V)) {  in ConstantFoldCastInstruction()
528     return UndefValue::get(DestTy);  in ConstantFoldCastInstruction()
617         return UndefValue::get(DestTy);  in ConstantFoldCastInstruction()
750       } else if (isa<UndefValue>(Cond)) {  in ConstantFoldSelectInstruction()
751         V = isa<UndefValue>(V1Element) ? V1Element : V2Element;  in ConstantFoldSelectInstruction()
764   if (isa<UndefValue>(Cond)) {  in ConstantFoldSelectInstruction()
765     if (isa<UndefValue>(V1)) return V1;  in ConstantFoldSelectInstruction()
768   if (isa<UndefValue>(V1)) return V2;  in ConstantFoldSelectInstruction()
769   if (isa<UndefValue>(V2)) return V1;  in ConstantFoldSelectInstruction()
788   if (isa<UndefValue>(Val))  // ee(undef, x) -> undef  in ConstantFoldExtractElementInstruction()
789     return UndefValue::get(Val->getType()->getVectorElementType());  in ConstantFoldExtractElementInstruction()
793   if (isa<UndefValue>(Idx))  in ConstantFoldExtractElementInstruction()
794     return UndefValue::get(Val->getType()->getVectorElementType());  in ConstantFoldExtractElementInstruction()
799       return UndefValue::get(Val->getType()->getVectorElementType());  in ConstantFoldExtractElementInstruction()
808   if (isa<UndefValue>(Idx))  in ConstantFoldInsertElementInstruction()
809     return UndefValue::get(Val->getType());  in ConstantFoldInsertElementInstruction()
816     return UndefValue::get(Val->getType());  in ConstantFoldInsertElementInstruction()
842   if (isa<UndefValue>(Mask))  in ConstantFoldShuffleVectorInstruction()
843     return UndefValue::get(VectorType::get(EltTy, MaskNumElts));  in ConstantFoldShuffleVectorInstruction()
855       Result.push_back(UndefValue::get(EltTy));  in ConstantFoldShuffleVectorInstruction()
860       InElt = UndefValue::get(EltTy);  in ConstantFoldShuffleVectorInstruction()
925                         (isa<UndefValue>(C1) || isa<UndefValue>(C2));  in ConstantFoldBinaryInstruction()
929       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
936       return UndefValue::get(C1->getType());  in ConstantFoldBinaryInstruction()
938       if (isa<UndefValue>(C1) && isa<UndefValue>(C2)) // undef & undef -> undef  in ConstantFoldBinaryInstruction()
943       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
949           return UndefValue::get(C1->getType());  in ConstantFoldBinaryInstruction()
957       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
976       if (isa<UndefValue>(C1) && isa<UndefValue>(C2)) // undef | undef -> undef  in ConstantFoldBinaryInstruction()
981       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
990       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
1000       if (isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
1013       if (isa<UndefValue>(C1) && isa<UndefValue>(C2))  in ConstantFoldBinaryInstruction()
1050         return UndefValue::get(CI2->getType());               // X / 0 == undef  in ConstantFoldBinaryInstruction()
1057         return UndefValue::get(CI2->getType());               // X % 0 == undef  in ConstantFoldBinaryInstruction()
1151           return UndefValue::get(CI1->getType());   // MIN_INT / -1 -> undef  in ConstantFoldBinaryInstruction()
1159           return UndefValue::get(CI1->getType());   // MIN_INT % -1 -> undef  in ConstantFoldBinaryInstruction()
1170         return UndefValue::get(C1->getType()); // too big shift is undef  in ConstantFoldBinaryInstruction()
1174         return UndefValue::get(C1->getType()); // too big shift is undef  in ConstantFoldBinaryInstruction()
1178         return UndefValue::get(C1->getType()); // too big shift is undef  in ConstantFoldBinaryInstruction()
1231         return UndefValue::get(VTy);  in ConstantFoldBinaryInstruction()
1714   if (isa<UndefValue>(C1) || isa<UndefValue>(C2)) {  in ConstantFoldCompareInstruction()
1721       return UndefValue::get(ResultTy);  in ConstantFoldCompareInstruction()
2077   if (isa<UndefValue>(C))  in ConstantFoldGetElementPtr()
2078     return UndefValue::get(GEPTy);  in ConstantFoldGetElementPtr()
2081   if (Idxs.size() == 1 && (Idx0->isNullValue() || isa<UndefValue>(Idx0)))  in ConstantFoldGetElementPtr()
2090       if (!isa<UndefValue>(Idxs[i]) &&  in ConstantFoldGetElementPtr()