+
+ DominatorTree *DT = 0;
+ if (PP) {
+ // FIXME: Reconstruct dom info, because it is not preserved properly.
+ // Incrementally updating domtree after loop unrolling would be easy.
+ if (DominatorTreeWrapperPass *DTWP =
+ PP->getAnalysisIfAvailable<DominatorTreeWrapperPass>()) {
+ DT = &DTWP->getDomTree();
+ DT->recalculate(*L->getHeader()->getParent());
+ }
+
+ // Simplify any new induction variables in the partially unrolled loop.
+ ScalarEvolution *SE = PP->getAnalysisIfAvailable<ScalarEvolution>();
+ if (SE && !CompletelyUnroll) {
+ SmallVector<WeakVH, 16> DeadInsts;
+ simplifyLoopIVs(L, SE, LPM, DeadInsts);
+
+ // Aggressively clean up dead instructions that simplifyLoopIVs already
+ // identified. Any remaining should be cleaned up below.
+ while (!DeadInsts.empty())
+ if (Instruction *Inst =
+ dyn_cast_or_null<Instruction>(&*DeadInsts.pop_back_val()))
+ RecursivelyDeleteTriviallyDeadInstructions(Inst);
+ }
+ }