[llvm] 05607a3 - [CodeGen] Avoid repeated hash lookups (NFC) (#131551)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-03-16T23:52:16-07:00
New Revision: 05607a3f39f97449e75358159ce8526e5d734615

URL: https://github.com/llvm/llvm-project/commit/05607a3f39f97449e75358159ce8526e5d734615
DIFF: https://github.com/llvm/llvm-project/commit/05607a3f39f97449e75358159ce8526e5d734615.diff

LOG: [CodeGen] Avoid repeated hash lookups (NFC) (#131551)

Added: 
    

Modified: 
    llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
index 2bd3211d33304..272749f5574c6 100644
--- a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
+++ b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
@@ -2612,13 +2612,13 @@ removeRedundantDbgLocsUsingForwardScan(const BasicBlock *BB,
         NumDefsScanned++;
         DebugVariable Key(FnVarLocs.getVariable(Loc.VariableID).getVariable(),
                           std::nullopt, Loc.DL.getInlinedAt());
-        auto VMI = VariableMap.find(Key);
+        auto [VMI, Inserted] = VariableMap.try_emplace(Key);
 
         // Update the map if we found a new value/expression describing the
         // variable, or if the variable wasn't mapped already.
-        if (VMI == VariableMap.end() || VMI->second.first != Loc.Values ||
+        if (Inserted || VMI->second.first != Loc.Values ||
             VMI->second.second != Loc.Expr) {
-          VariableMap[Key] = {Loc.Values, Loc.Expr};
+          VMI->second = {Loc.Values, Loc.Expr};
           NewDefs.push_back(Loc);
           continue;
         }