From eb68f080ef2af65d09521816d2202d445ea9586c Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 31 Oct 2006 17:52:18 +0000 Subject: Fix PR977 and Transforms/LCSSA/2006-10-31-UnreachableBlock.ll llvm-svn: 31315 --- llvm/lib/Transforms/Utils/LCSSA.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'llvm/lib/Transforms/Utils/LCSSA.cpp') diff --git a/llvm/lib/Transforms/Utils/LCSSA.cpp b/llvm/lib/Transforms/Utils/LCSSA.cpp index 6f93ac6fcef..b369a738dca 100644 --- a/llvm/lib/Transforms/Utils/LCSSA.cpp +++ b/llvm/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. -- cgit v1.2.3