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Avoid making the transformation enabled by my last patch if the new destinations have phi nodes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69121 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -267,11 +267,21 @@ bool CondProp::RevectorBlockTo(BasicBlock *FromBB, Value *Cond, BranchInst *BI){
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// Change FromBr to branch to the new destination.
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FromBr->setSuccessor(0, ToBB);
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} else {
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// Insert the new conditional branch.
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BranchInst::Create(BI->getSuccessor(0), BI->getSuccessor(1), Cond, FromBr);
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BasicBlock *Succ0 = BI->getSuccessor(0);
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// Do not perform transform if the new destination has PHI nodes. The
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// transform will add new preds to the PHI's.
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if (isa<PHINode>(Succ0->begin()))
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return false;
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FoldSingleEntryPHINodes(BI->getSuccessor(0));
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FoldSingleEntryPHINodes(BI->getSuccessor(1));
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BasicBlock *Succ1 = BI->getSuccessor(1);
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if (isa<PHINode>(Succ1->begin()))
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return false;
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// Insert the new conditional branch.
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BranchInst::Create(Succ0, Succ1, Cond, FromBr);
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FoldSingleEntryPHINodes(Succ0);
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FoldSingleEntryPHINodes(Succ1);
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// Update PHI nodes in OldSucc to know that FromBB no longer branches to it.
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OldSucc->removePredecessor(FromBB);
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