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[DAG] Avoid redundant chain transversal in store merge cycle check. NFCI. 

Patch by Henric Karlsson.

llvm-svn: 339688
This commit is contained in:
Nirav Dave 2018-08-14 16:20:43 +00:00
parent 8e35f1e7cb
commit fbfe2ad9e0
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -13971,11 +13971,12 @@ bool DAGCombiner::checkMergeStoreCandidatesForDependencies(
Worklist.push_back(RootNode); Worklist.push_back(RootNode);
while (!Worklist.empty()) { while (!Worklist.empty()) {
auto N = Worklist.pop_back_val(); auto N = Worklist.pop_back_val();
if (!Visited.insert(N).second)
continue; // Already present in Visited.
if (N->getOpcode() == ISD::TokenFactor) { if (N->getOpcode() == ISD::TokenFactor) {
for (SDValue Op : N->ops()) for (SDValue Op : N->ops())
Worklist.push_back(Op.getNode()); Worklist.push_back(Op.getNode());
} }
Visited.insert(N);
} }
// Don't count pruning nodes towards max. // Don't count pruning nodes towards max.