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Fix PR16797 - Support PHINodes with multiple inputs from the same basic block.

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Do not generate new vector values for the same entries because we know that the incoming values
from the same block must be identical.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188185 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2013-08-12 17:46:44 +00:00
parent 225396c2b5
commit 353476cbbb
2 changed files with 52 additions and 0 deletions
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11
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@@ -1187,10 +1187,21 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
PHINode *NewPhi = Builder.CreatePHI(VecTy, PH->getNumIncomingValues());
E->VectorizedValue = NewPhi;
// PHINodes may have multiple entries from the same block. We want to
// visit every block once.
SmallSet<BasicBlock*, 4> VisitedBBs;
for (unsigned i = 0, e = PH->getNumIncomingValues(); i < e; ++i) {
ValueList Operands;
BasicBlock *IBB = PH->getIncomingBlock(i);
if (VisitedBBs.count(IBB)) {
NewPhi->addIncoming(NewPhi->getIncomingValueForBlock(IBB), IBB);
continue;
}
VisitedBBs.insert(IBB);
// Prepare the operand vector.
for (unsigned j = 0; j < E->Scalars.size(); ++j)
Operands.push_back(cast<PHINode>(E->Scalars[j])->