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defensive patch: if CGP is merging a block with the entry block, make sure
it ends up being the entry block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60180 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -204,8 +204,15 @@ void CodeGenPrepare::EliminateMostlyEmptyBlock(BasicBlock *BB) {
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// If the destination block has a single pred, then this is a trivial edge,
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// just collapse it.
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if (DestBB->getSinglePredecessor()) {
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if (BasicBlock *SinglePred = DestBB->getSinglePredecessor()) {
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// Remember if SinglePred was the entry block of the function. If so, we
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// will need to move BB back to the entry position.
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bool isEntry = SinglePred == &SinglePred->getParent()->getEntryBlock();
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MergeBasicBlockIntoOnlyPred(DestBB);
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if (isEntry && BB != &BB->getParent()->getEntryBlock())
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BB->moveBefore(&BB->getParent()->getEntryBlock());
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DOUT << "AFTER:\n" << *DestBB << "\n\n\n";
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return;
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}
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