[llvm] [SLPVectorizer] Avoid repeated hash lookups (NFC) (PR #107491)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/107491.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp (+2-7) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index a77d236413a968..c87d1055c8bc5d 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -5854,13 +5854,8 @@ void BoUpSLP::reorderBottomToTop(bool IgnoreReorder) {
       }
       // Build a map between user nodes and their operands order to speedup
       // search. The graph currently does not provide this dependency directly.
-      for (EdgeInfo &EI : TE->UserTreeIndices) {
-        TreeEntry *UserTE = EI.UserTE;
-        auto It = Users.find(UserTE);
-        if (It == Users.end())
-          It = Users.insert({UserTE, {}}).first;
-        It->second.emplace_back(EI.EdgeIdx, TE);
-      }
+      for (EdgeInfo &EI : TE->UserTreeIndices)
+        Users[EI.UserTE].emplace_back(EI.EdgeIdx, TE);
     }
     // Erase filtered entries.
     for (TreeEntry *TE : Filtered)

``````````

</details>


https://github.com/llvm/llvm-project/pull/107491