diff options
| -rw-r--r-- | lib/Transforms/Utils/LoopUnroll.cpp | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/Transforms/Utils/LoopUnroll.cpp b/lib/Transforms/Utils/LoopUnroll.cpp index d68427a..3c58abe 100644 --- a/lib/Transforms/Utils/LoopUnroll.cpp +++ b/lib/Transforms/Utils/LoopUnroll.cpp @@ -108,8 +108,19 @@ static BasicBlock *FoldBlockIntoPredecessor(BasicBlock *BB, LoopInfo* LI) { bool llvm::UnrollLoop(Loop *L, unsigned Count, LoopInfo* LI, LPPassManager* LPM) { assert(L->isLCSSAForm()); - BasicBlock *Header = L->getHeader(); + BasicBlock *Preheader = L->getLoopPreheader(); + if (!Preheader) { + DEBUG(errs() << " Can't unroll; loop preheader-insertion failed.\n"); + return false; + } + BasicBlock *LatchBlock = L->getLoopLatch(); + if (!LatchBlock) { + DEBUG(errs() << " Can't unroll; loop exit-block-insertion failed.\n"); + return false; + } + + BasicBlock *Header = L->getHeader(); BranchInst *BI = dyn_cast<BranchInst>(LatchBlock->getTerminator()); if (!BI || BI->isUnconditional()) { |