From 1753faee81500559761646cd0b04bb73535edb8e Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 31 Oct 2006 17:52:18 +0000 Subject: [PATCH] Fix PR977 and Transforms/LCSSA/2006-10-31-UnreachableBlock.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31315 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Utils/LCSSA.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/lib/Transforms/Utils/LCSSA.cpp b/lib/Transforms/Utils/LCSSA.cpp index 6f93ac6fcef..b369a738dca 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.