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[CodeLayout] Fixing initialization of empty ranges #68917

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Merged
merged 1 commit into from
Oct 13, 2023
Merged

[CodeLayout] Fixing initialization of empty ranges #68917

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9 changes: 6 additions & 3 deletions llvm/lib/Transforms/Utils/CodeLayout.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -476,13 +476,16 @@ void ChainT::mergeEdges(ChainT *Other) {
}

using NodeIter = std::vector<NodeT *>::const_iterator;
static std::vector<NodeT *> EmptyList;

/// A wrapper around three concatenated vectors (chains) of nodes; it is used
/// to avoid extra instantiation of the vectors.
struct MergedNodesT {
MergedNodesT(NodeIter Begin1, NodeIter End1, NodeIter Begin2 = NodeIter(),
NodeIter End2 = NodeIter(), NodeIter Begin3 = NodeIter(),
NodeIter End3 = NodeIter())
MergedNodesT(NodeIter Begin1, NodeIter End1,
NodeIter Begin2 = EmptyList.begin(),
NodeIter End2 = EmptyList.end(),
NodeIter Begin3 = EmptyList.begin(),
NodeIter End3 = EmptyList.end())
: Begin1(Begin1), End1(End1), Begin2(Begin2), End2(End2), Begin3(Begin3),
End3(End3) {}

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