- if (TINode) // Don't break unreachable code!
- DT->createNewNode(NewBB, TINode);
+ if (TINode) { // Don't break unreachable code!
+ DomTreeNode *NewBBNode = DT->addNewBlock(NewBB, TIBB);
+ DomTreeNode *DestBBNode = 0;
+
+ // If NewBBDominatesDestBB hasn't been computed yet, do so with DT.
+ if (!OtherPreds.empty()) {
+ DestBBNode = DT->getNode(DestBB);
+ while (!OtherPreds.empty() && NewBBDominatesDestBB) {
+ if (DomTreeNode *OPNode = DT->getNode(OtherPreds.back()))
+ NewBBDominatesDestBB = DT->dominates(DestBBNode, OPNode);
+ OtherPreds.pop_back();
+ }
+ OtherPreds.clear();
+ }
+
+ // If NewBBDominatesDestBB, then NewBB dominates DestBB, otherwise it
+ // doesn't dominate anything.
+ if (NewBBDominatesDestBB) {
+ if (!DestBBNode) DestBBNode = DT->getNode(DestBB);
+ DT->changeImmediateDominator(DestBBNode, NewBBNode);
+ }
+ }