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Return Undef if the block has no dominator. This was required to allow

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llvm-gcc build to succeed. Without this change it fails in libstdc++
compilation. This causes no regressions in dejagnu tests. However, 
someone who knows this code better might want to review it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@39924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-07-16 21:03:44 +00:00
parent 384152444d
commit bde6869ef4
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Utils/LCSSA.cpp
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@ -231,6 +231,10 @@ Value *LCSSA::GetValueForBlock(DomTreeNode *BB, Instruction *OrigInst,
DomTreeNode *IDom = BB->getIDom();
// If the block has no dominator, bail
if (!IDom)
return V = UndefValue::get(OrigInst->getType());
// Otherwise, there are two cases: we either have to insert a PHI node or we
// don't. We need to insert a PHI node if this block is not dominated by one
// of the exit nodes from the loop (the loop could have multiple exits, and