[llvm] [IPO] Avoid repeated map lookups (NFC) (PR #128462)

[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/128462.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/IPO/SampleContextTracker.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/Transforms/IPO/SampleContextTracker.cpp b/llvm/lib/Transforms/IPO/SampleContextTracker.cpp
index f878e3e591a05..270ca56d04823 100644
--- a/llvm/lib/Transforms/IPO/SampleContextTracker.cpp
+++ b/llvm/lib/Transforms/IPO/SampleContextTracker.cpp
@@ -71,8 +71,8 @@ SampleContextTracker::moveContextSamples(ContextTrieNode &ToNodeParent,
   std::map<uint64_t, ContextTrieNode> &AllChildContext =
       ToNodeParent.getAllChildContext();
   assert(!AllChildContext.count(Hash) && "Node to remove must exist");
-  AllChildContext[Hash] = NodeToMove;
   ContextTrieNode &NewNode = AllChildContext[Hash];
+  NewNode = NodeToMove;
   NewNode.setCallSiteLoc(CallSite);
 
   // Walk through nodes in the moved the subtree, and update

``````````

</details>


https://github.com/llvm/llvm-project/pull/128462