[llvm] [Scalar] Avoid repeated hash lookups (NFC) (PR #130463)

[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/130463.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Scalar/StructurizeCFG.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp b/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
index b1f742b838f2a..89a2a7ac9be3f 100644
--- a/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
+++ b/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
@@ -852,10 +852,11 @@ void StructurizeCFG::setPhiValues() {
     BasicBlock *To = AddedPhi.first;
     const BBVector &From = AddedPhi.second;
 
-    if (!DeletedPhis.count(To))
+    auto It = DeletedPhis.find(To);
+    if (It == DeletedPhis.end())
       continue;
 
-    PhiMap &Map = DeletedPhis[To];
+    PhiMap &Map = It->second;
     SmallVector<BasicBlock *> &UndefBlks = UndefBlksMap[To];
     for (const auto &[Phi, Incoming] : Map) {
       Value *Undef = UndefValue::get(Phi->getType());

``````````

</details>


https://github.com/llvm/llvm-project/pull/130463