[llvm] [Utils] Avoid repeated hash lookups (NFC) (PR #127959)

[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/127959.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Utils/AssumeBundleBuilder.cpp (+2-4) 


``````````diff
diff --git a/llvm/lib/Transforms/Utils/AssumeBundleBuilder.cpp b/llvm/lib/Transforms/Utils/AssumeBundleBuilder.cpp
index 2d9a3d1f8a110..78b9c7d06e183 100644
--- a/llvm/lib/Transforms/Utils/AssumeBundleBuilder.cpp
+++ b/llvm/lib/Transforms/Utils/AssumeBundleBuilder.cpp
@@ -178,11 +178,9 @@ struct AssumeBuilderState {
     if (tryToPreserveWithoutAddingAssume(RK))
       return;
     MapKey Key{RK.WasOn, RK.AttrKind};
-    auto Lookup = AssumedKnowledgeMap.find(Key);
-    if (Lookup == AssumedKnowledgeMap.end()) {
-      AssumedKnowledgeMap[Key] = RK.ArgValue;
+    auto [Lookup, Inserted] = AssumedKnowledgeMap.try_emplace(Key, RK.ArgValue);
+    if (Inserted)
       return;
-    }
     assert(((Lookup->second == 0 && RK.ArgValue == 0) ||
             (Lookup->second != 0 && RK.ArgValue != 0)) &&
            "inconsistent argument value");

``````````

</details>


https://github.com/llvm/llvm-project/pull/127959