[llvm] [Vectorize] Avoid repeated hash lookups (NFC) (PR #126345)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-vectorizers

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/126345.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp b/llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
index 0b40b733ffe7ee..04b392829f0d78 100644
--- a/llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
@@ -1335,8 +1335,9 @@ void Vectorizer::mergeEquivalenceClasses(EquivalenceClassMap &EQClasses) const {
     const auto &Key = EC.first;
     EqClassReducedKey RedKey{std::get<1>(Key), std::get<2>(Key),
                              std::get<3>(Key)};
-    RedKeyToUOMap[RedKey].insert(std::get<0>(Key));
-    if (RedKeyToUOMap[RedKey].size() > 1)
+    auto &UOMap = RedKeyToUOMap[RedKey];
+    UOMap.insert(std::get<0>(Key));
+    if (UOMap.size() > 1)
       FoundPotentiallyOptimizableEC = true;
   }
   if (!FoundPotentiallyOptimizableEC)

``````````

</details>


https://github.com/llvm/llvm-project/pull/126345