521       iset_(nullptr),  in HLoopOptimization()
598   iset_ = &iset;  in LocalRun()
608   iset_ = nullptr;  in LocalRun()
801         for (HInstruction* i : *iset_) {  in SimplifyInduction()
804         DCHECK(CheckInductionSetFullyRemoved(iset_));  in SimplifyInduction()
2862   iset_->clear();  in TrySetPhiInduction()
2890       iset_->insert(i);  // copy  in TrySetPhiInduction()
2935   iset_->clear();  in TrySetSimpleLoopHeader()
2968           iset_->insert(c);  in TrySetSimpleLoopHeader()
2969           iset_->insert(s);  in TrySetSimpleLoopHeader()
2985     if (!instruction->IsGoto() && iset_->find(instruction) == iset_->end()) {  in IsEmptyBody()
3010     if (iset_->find(user) == iset_->end()) {  // not excluded?  in IsOnlyUsedAfterLoop()
3015           iset_->insert(user);  in IsOnlyUsedAfterLoop()
3038       if (iset_->find(user) == iset_->end()) {  // not excluded?  in TryReplaceWithLastValue()
3054       if (iset_->find(user->GetHolder()) == iset_->end()) {  // not excluded?  in TryReplaceWithLastValue()
3093   for (HInstruction* i : *iset_) {  in CanRemoveCycle()