[llvm] [Coroutines] Avoid repeated hash lookps (NFC) (PR #110076)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-coroutines

@llvm/pr-subscribers-llvm-transforms

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/110076.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Coroutines/SpillUtils.cpp (+3-5) 


``````````diff
diff --git a/llvm/lib/Transforms/Coroutines/SpillUtils.cpp b/llvm/lib/Transforms/Coroutines/SpillUtils.cpp
index f213ac1c8d7d57..96b5c8440e5f9a 100644
--- a/llvm/lib/Transforms/Coroutines/SpillUtils.cpp
+++ b/llvm/lib/Transforms/Coroutines/SpillUtils.cpp
@@ -397,13 +397,11 @@ struct AllocaUseVisitor : PtrUseVisitor<AllocaUseVisitor> {
     if (!IsOffsetKnown) {
       AliasOffetMap[&I].reset();
     } else {
-      auto Itr = AliasOffetMap.find(&I);
-      if (Itr == AliasOffetMap.end()) {
-        AliasOffetMap[&I] = Offset;
-      } else if (Itr->second && *Itr->second != Offset) {
+      auto [Itr, Inserted] = AliasOffetMap.try_emplace(&I, Offset);
+      if (!Inserted && Itr->second && *Itr->second != Offset) {
         // If we have seen two different possible values for this alias, we set
         // it to empty.
-        AliasOffetMap[&I].reset();
+        Itr->second.reset();
       }
     }
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/110076