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[DAG] Avoid redundancy in StoreMerge TokenFactor generation. 

Avoid generating redundant TokenFactor when all merged stores have
the same chain.

llvm-svn: 357299
This commit is contained in:
Nirav Dave 2019-03-29 18:50:22 +00:00
parent 9e911f3a64
commit 7e84cacdbd
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -14514,9 +14514,9 @@ SDValue DAGCombiner::getMergeStoreChains(SmallVectorImpl<MemOpLink> &StoreNodes,
Visited.insert(StoreNodes[i].MemNode);
}
// don't include nodes that are children
// don't include nodes that are children or repeated nodes.
for (unsigned i = 0; i < NumStores; ++i) {
if (Visited.count(StoreNodes[i].MemNode->getChain().getNode()) == 0)
if (Visited.insert(StoreNodes[i].MemNode->getChain().getNode()).second)
Chains.push_back(StoreNodes[i].MemNode->getChain());
}