[llvm] [IR] Avoid repeated hash lookups (NFC) (PR #120848)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-ir

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/120848.diff


1 Files Affected:

- (modified) llvm/include/llvm/IR/ModuleSummaryIndex.h (+3-4) 


``````````diff
diff --git a/llvm/include/llvm/IR/ModuleSummaryIndex.h b/llvm/include/llvm/IR/ModuleSummaryIndex.h
index 2a05c2ac0758c0..3c586a1dd21d82 100644
--- a/llvm/include/llvm/IR/ModuleSummaryIndex.h
+++ b/llvm/include/llvm/IR/ModuleSummaryIndex.h
@@ -1711,10 +1711,9 @@ class ModuleSummaryIndex {
                        GlobalValue::GUID OrigGUID) {
     if (OrigGUID == 0 || ValueGUID == OrigGUID)
       return;
-    if (OidGuidMap.count(OrigGUID) && OidGuidMap[OrigGUID] != ValueGUID)
-      OidGuidMap[OrigGUID] = 0;
-    else
-      OidGuidMap[OrigGUID] = ValueGUID;
+    auto [It, Inserted] = OidGuidMap.try_emplace(OrigGUID, ValueGUID);
+    if (!Inserted && It->second != ValueGUID)
+      It->second = 0;
   }
 
   /// Find the summary for ValueInfo \p VI in module \p ModuleId, or nullptr if

``````````

</details>


https://github.com/llvm/llvm-project/pull/120848