[llvm] [Utils] Avoid repeated hash lookups (NFC) (PR #115262)

[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/115262.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Utils/Local.cpp (+3-5) 


``````````diff
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 47a70492559610..768765b6c1e632 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -2178,11 +2178,9 @@ void llvm::insertDebugValuesForPHIs(BasicBlock *BB,
       auto V = DbgValueMap.find(VI);
       if (V != DbgValueMap.end()) {
         auto *DbgII = cast<DbgVariableIntrinsic>(V->second);
-        auto NewDI = NewDbgValueMap.find({Parent, DbgII});
-        if (NewDI == NewDbgValueMap.end()) {
-          auto *NewDbgII = cast<DbgVariableIntrinsic>(DbgII->clone());
-          NewDI = NewDbgValueMap.insert({{Parent, DbgII}, NewDbgII}).first;
-        }
+        auto [NewDI, Inserted] = NewDbgValueMap.try_emplace({Parent, DbgII});
+        if (Inserted)
+          NewDI->second = cast<DbgVariableIntrinsic>(DbgII->clone());
         DbgVariableIntrinsic *NewDbgII = NewDI->second;
         // If PHI contains VI as an operand more than once, we may
         // replaced it in NewDbgII; confirm that it is present.

``````````

</details>


https://github.com/llvm/llvm-project/pull/115262