[llvm] afe14bb - [Utils] Avoid repeated hash lookups (NFC) (#129990)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-03-06T08:49:36-08:00
New Revision: afe14bb0e4c5694bf92e88112bef9f99d29430a9

URL: https://github.com/llvm/llvm-project/commit/afe14bb0e4c5694bf92e88112bef9f99d29430a9
DIFF: https://github.com/llvm/llvm-project/commit/afe14bb0e4c5694bf92e88112bef9f99d29430a9.diff

LOG: [Utils] Avoid repeated hash lookups (NFC) (#129990)

Added: 
    

Modified: 
    llvm/lib/Transforms/Utils/SimplifyCFG.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index c71605c500686..eb03689f31949 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -5833,9 +5833,10 @@ static bool eliminateDeadSwitchCases(SwitchInst *SI, DomTreeUpdater *DTU,
   for (const auto &Case : SI->cases()) {
     auto *Successor = Case.getCaseSuccessor();
     if (DTU) {
-      if (!NumPerSuccessorCases.count(Successor))
+      auto [It, Inserted] = NumPerSuccessorCases.try_emplace(Successor);
+      if (Inserted)
         UniqueSuccessors.push_back(Successor);
-      ++NumPerSuccessorCases[Successor];
+      ++It->second;
     }
     const APInt &CaseVal = Case.getCaseValue()->getValue();
     if (Known.Zero.intersects(CaseVal) || !Known.One.isSubsetOf(CaseVal) ||