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Fix PR977 and Transforms/LCSSA/2006-10-31-UnreachableBlock.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31315 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-10-31 17:52:18 +00:00
parent c176fa3d37
commit 1753faee81
1 changed files with 8 additions and 1 deletions
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9
lib/Transforms/Utils/LCSSA.cpp
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@ -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.