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[IPO] Avoid repeated hash lookups (NFC) #129419

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Merged
merged 1 commit into from
Mar 2, 2025
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[IPO] Avoid repeated hash lookups (NFC) #129419

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7 changes: 4 additions & 3 deletions llvm/include/llvm/Transforms/IPO/ProfiledCallGraph.h
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Original file line number Diff line number Diff line change
Expand Up @@ -135,14 +135,15 @@ class ProfiledCallGraph {
ProfiledCallGraphNode *getEntryNode() { return &Root; }

void addProfiledFunction(FunctionId Name) {
if (!ProfiledFunctions.count(Name)) {
auto [It, Inserted] = ProfiledFunctions.try_emplace(Name);
if (Inserted) {
// Link to synthetic root to make sure every node is reachable
// from root. This does not affect SCC order.
// Store the pointer of the node because the map can be rehashed.
auto &Node =
ProfiledCallGraphNodeList.emplace_back(ProfiledCallGraphNode(Name));
ProfiledFunctions[Name] = &Node;
Root.Edges.emplace(&Root, ProfiledFunctions[Name], 0);
It->second = &Node;
Root.Edges.emplace(&Root, It->second, 0);
}
}

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