[llvm] af922cf - [CodeGen] Avoid repeated hash lookups (NFC) (#127745)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-02-19T08:20:46-08:00
New Revision: af922cf9f7e7f126f2efaf9660ceea8e5eba21b5

URL: https://github.com/llvm/llvm-project/commit/af922cf9f7e7f126f2efaf9660ceea8e5eba21b5
DIFF: https://github.com/llvm/llvm-project/commit/af922cf9f7e7f126f2efaf9660ceea8e5eba21b5.diff

LOG: [CodeGen] Avoid repeated hash lookups (NFC) (#127745)

Added: 
    

Modified: 
    llvm/lib/CodeGen/WinEHPrepare.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/WinEHPrepare.cpp b/llvm/lib/CodeGen/WinEHPrepare.cpp
index b98523cac1f2f..1970716485613 100644
--- a/llvm/lib/CodeGen/WinEHPrepare.cpp
+++ b/llvm/lib/CodeGen/WinEHPrepare.cpp
@@ -251,15 +251,15 @@ void llvm::calculateCXXStateForAsynchEH(const BasicBlock *BB, int State,
     const BasicBlock *BB = WI->Block;
     int State = WI->State;
     delete WI;
-    if (auto It = EHInfo.BlockToStateMap.find(BB);
-        It != EHInfo.BlockToStateMap.end() && It->second <= State)
+    auto [StateIt, Inserted] = EHInfo.BlockToStateMap.try_emplace(BB);
+    if (!Inserted && StateIt->second <= State)
       continue; // skip blocks already visited by lower State
 
     BasicBlock::const_iterator It = BB->getFirstNonPHIIt();
     const llvm::Instruction *TI = BB->getTerminator();
     if (It->isEHPad())
       State = EHInfo.EHPadStateMap[&*It];
-    EHInfo.BlockToStateMap[BB] = State; // Record state, also flag visiting
+    StateIt->second = State; // Record state, also flag visiting
 
     if ((isa<CleanupReturnInst>(TI) || isa<CatchReturnInst>(TI)) && State > 0) {
       // Retrive the new State