[llvm] f892dc7 - [Transforms] Avoid repeated hash lookups (NFC) (#129359)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-03-01T08:13:52-08:00
New Revision: f892dc7440c17ca880359174e7bd1ea599869f7d

URL: https://github.com/llvm/llvm-project/commit/f892dc7440c17ca880359174e7bd1ea599869f7d
DIFF: https://github.com/llvm/llvm-project/commit/f892dc7440c17ca880359174e7bd1ea599869f7d.diff

LOG: [Transforms] Avoid repeated hash lookups (NFC) (#129359)

Added: 
    

Modified: 
    llvm/include/llvm/Transforms/Utils/SampleProfileLoaderBaseImpl.h

Removed: 
    


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diff  --git a/llvm/include/llvm/Transforms/Utils/SampleProfileLoaderBaseImpl.h b/llvm/include/llvm/Transforms/Utils/SampleProfileLoaderBaseImpl.h
index 390f284019bb4..d714dba4a9687 100644
--- a/llvm/include/llvm/Transforms/Utils/SampleProfileLoaderBaseImpl.h
+++ b/llvm/include/llvm/Transforms/Utils/SampleProfileLoaderBaseImpl.h
@@ -646,14 +646,13 @@ void SampleProfileLoaderBaseImpl<BT>::findEquivalenceClasses(FunctionT &F) {
     BasicBlockT *BB1 = &BB;
 
     // Compute BB1's equivalence class once.
-    if (EquivalenceClass.count(BB1)) {
+    // By default, blocks are in their own equivalence class.
+    auto [It, Inserted] = EquivalenceClass.try_emplace(BB1, BB1);
+    if (!Inserted) {
       LLVM_DEBUG(printBlockEquivalence(dbgs(), BB1));
       continue;
     }
 
-    // By default, blocks are in their own equivalence class.
-    EquivalenceClass[BB1] = BB1;
-
     // Traverse all the blocks dominated by BB1. We are looking for
     // every basic block BB2 such that:
     //