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

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/127745

None

>From 57f97378666838bbb2cdba4e0f80ed44c96a7246 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Tue, 18 Feb 2025 09:45:42 -0800
Subject: [PATCH] [CodeGen] Avoid repeated hash lookups (NFC)

---
 llvm/lib/CodeGen/WinEHPrepare.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

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