[llvm] 80a4718 - [GVNHoist] Avoid repeated hash lookups (NFC) (#126189)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-02-07T07:59:53-08:00
New Revision: 80a471820071c1913e0159eaf932a6547fc9c42f

URL: https://github.com/llvm/llvm-project/commit/80a471820071c1913e0159eaf932a6547fc9c42f
DIFF: https://github.com/llvm/llvm-project/commit/80a471820071c1913e0159eaf932a6547fc9c42f.diff

LOG: [GVNHoist] Avoid repeated hash lookups (NFC) (#126189)

Added: 
    

Modified: 
    llvm/lib/Transforms/Scalar/GVNHoist.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Scalar/GVNHoist.cpp b/llvm/lib/Transforms/Scalar/GVNHoist.cpp
index c6f015112e59df1..1c2e1531e47d882 100644
--- a/llvm/lib/Transforms/Scalar/GVNHoist.cpp
+++ b/llvm/lib/Transforms/Scalar/GVNHoist.cpp
@@ -564,21 +564,20 @@ unsigned int GVNHoist::rank(const Value *V) const {
 }
 
 bool GVNHoist::hasEH(const BasicBlock *BB) {
-  auto It = BBSideEffects.find(BB);
-  if (It != BBSideEffects.end())
+  auto [It, Inserted] = BBSideEffects.try_emplace(BB);
+  if (!Inserted)
     return It->second;
 
   if (BB->isEHPad() || BB->hasAddressTaken()) {
-    BBSideEffects[BB] = true;
+    It->second = true;
     return true;
   }
 
   if (BB->getTerminator()->mayThrow()) {
-    BBSideEffects[BB] = true;
+    It->second = true;
     return true;
   }
 
-  BBSideEffects[BB] = false;
   return false;
 }