diff options
| -rw-r--r-- | lib/Transforms/Utils/LCSSA.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/Transforms/Utils/LCSSA.cpp b/lib/Transforms/Utils/LCSSA.cpp index 6f93ac6fce..b369a738dc 100644 --- a/lib/Transforms/Utils/LCSSA.cpp +++ b/lib/Transforms/Utils/LCSSA.cpp @@ -184,7 +184,14 @@ void LCSSA::ProcessInstruction(Instruction *Instr, // Otherwise, patch up uses of the value with the appropriate LCSSA Phi, // inserting PHI nodes into join points where needed. - Value *Val = GetValueForBlock(DT->getNode(UserBB), Instr, Phis); + DominatorTree::Node *UserBBNode = DT->getNode(UserBB); + + // If the block has no dominator info, it is unreachable. + Value *Val; + if (UserBBNode) + Val = GetValueForBlock(UserBBNode, Instr, Phis); + else + Val = UndefValue::get(Instr->getType()); // Preincrement the iterator to avoid invalidating it when we change the // value. |