Transforms/InstCombine/InstructionCombining.cpp

3403 InstCombinerImpl::foldExtractOfOverflowIntrinsic(ExtractValueInst &EV) {
3404   auto *WO = dyn_cast<WithOverflowInst>(EV.getAggregateOperand());
3411     if (*EV.idx_begin() == 0 && (OvID == Intrinsic::smul_with_overflow ||
3433   if (*EV.idx_begin() == 0) {
3442   assert(*EV.idx_begin() == 1 && "Unexpected extract index for overflow inst");
3477 Instruction *InstCombinerImpl::visitExtractValueInst(ExtractValueInst &EV) {
3478   Value *Agg = EV.getAggregateOperand();
3480   if (!EV.hasIndices())
3481     return replaceInstUsesWith(EV, Agg);
3483   if (Value *V = simplifyExtractValueInst(Agg, EV.getIndices(),
3484                                           SQ.getWithInstruction(&EV)))
3485     return replaceInstUsesWith(EV, V);
3490     for (exti = EV.idx_begin(), insi = IV->idx_begin(),
3491          exte = EV.idx_end(), inse = IV->idx_end();
3504                                         EV.getIndices());
3511       return replaceInstUsesWith(EV, IV->getInsertedValueOperand());
3522                                                 EV.getIndices());
3539   if (Instruction *R = foldExtractOfOverflowIntrinsic(EV))
3558       for (unsigned Idx : EV.indices())
3566       Instruction *NL = Builder.CreateLoad(EV.getType(), GEP);
3572       return replaceInstUsesWith(EV, NL);
3577     if (Instruction *Res = foldOpIntoPhi(EV, PN))