[llvm] [IR] Avoid repeated hash lookups (NFC) (PR #110450)

[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/110450.diff


1 Files Affected:

- (modified) llvm/lib/IR/AsmWriter.cpp (+2-6) 


``````````diff
diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
index 70e3af941bf77b..280e347739cdb6 100644
--- a/llvm/lib/IR/AsmWriter.cpp
+++ b/llvm/lib/IR/AsmWriter.cpp
@@ -1338,12 +1338,8 @@ void SlotTracker::CreateMetadataSlot(const MDNode *N) {
 void SlotTracker::CreateAttributeSetSlot(AttributeSet AS) {
   assert(AS.hasAttributes() && "Doesn't need a slot!");
 
-  as_iterator I = asMap.find(AS);
-  if (I != asMap.end())
-    return;
-
-  unsigned DestSlot = asNext++;
-  asMap[AS] = DestSlot;
+  if (asMap.try_emplace(AS, asNext).second)
+    ++asNext;
 }
 
 /// Create a new slot for the specified Module

``````````

</details>


https://github.com/llvm/llvm-project/pull/110450