BasicBlock *PreheaderBB;
PreheaderBB = SplitBlockPredecessors(Header, OutsideBlocks, ".preheader", DT,
LI, PreserveLCSSA);
+ if (!PreheaderBB)
+ return nullptr;
DEBUG(dbgs() << "LoopSimplify: Creating pre-header "
<< PreheaderBB->getName() << "\n");
NewExitBB = SplitBlockPredecessors(Exit, LoopBlocks, ".loopexit", DT, LI,
PreserveLCSSA);
+ if (!NewExitBB)
+ return nullptr;
DEBUG(dbgs() << "LoopSimplify: Creating dedicated exit block "
<< NewExitBB->getName() << "\n");
return nullptr;
// The header is not a landing pad; preheader insertion should ensure this.
- assert(!L->getHeader()->isLandingPad() &&
- "Can't insert backedge to landing pad");
+ BasicBlock *Header = L->getHeader();
+ assert(!Header->isLandingPad() && "Can't insert backedge to landing pad");
+ if (!Header->canSplitPredecessors())
+ return nullptr;
PHINode *PN = findPHIToPartitionLoops(L, DT, AC);
if (!PN) return nullptr; // No known way to partition.
bool PreserveLCSSA = PP->mustPreserveAnalysisID(LCSSAID);
- BasicBlock *Header = L->getHeader();
BasicBlock *NewBB = SplitBlockPredecessors(Header, OuterLoopPreds, ".outer",
DT, LI, PreserveLCSSA);