diff options
| -rw-r--r-- | lib/Transforms/Scalar/GVN.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp index 590227c27f..498785e327 100644 --- a/lib/Transforms/Scalar/GVN.cpp +++ b/lib/Transforms/Scalar/GVN.cpp @@ -808,10 +808,10 @@ Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig, DenseMap<BasicBlock*, Value*>::iterator V = Phis.find(BB); if (V != Phis.end() && !top_level) return V->second; - if (!getAnalysis<DominatorTree>().isReachableFromEntry(BB)) { - Phis[BB] = UndefValue::get(orig->getType()); - return UndefValue::get(orig->getType()); - } + // If the block is unreachable, just return undef, since this path + // can't actually occur at runtime. + if (!getAnalysis<DominatorTree>().isReachableFromEntry(BB)) + return Phis[BB] = UndefValue::get(orig->getType()); BasicBlock* singlePred = BB->getSinglePredecessor(); if (singlePred) { |