[llvm] [Analysis] Avoid repeated hash lookups (NFC) (PR #140691)
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Tue May 20 00:40:44 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-analysis
Author: Kazu Hirata (kazutakahirata)
<details>
<summary>Changes</summary>
With this patch, we always update Inserted. That's OK because we only
read Inserted as shown in this patch. Without this patch, it's a
write-only variable.
---
Full diff: https://github.com/llvm/llvm-project/pull/140691.diff
1 Files Affected:
- (modified) llvm/lib/Analysis/IRSimilarityIdentifier.cpp (+5-6)
``````````diff
diff --git a/llvm/lib/Analysis/IRSimilarityIdentifier.cpp b/llvm/lib/Analysis/IRSimilarityIdentifier.cpp
index ffb684d284a94..930b2068b3b0f 100644
--- a/llvm/lib/Analysis/IRSimilarityIdentifier.cpp
+++ b/llvm/lib/Analysis/IRSimilarityIdentifier.cpp
@@ -1306,12 +1306,11 @@ static void findCandidateStructures(
CandIt != CandEndIt; CandIt++) {
// Determine if it has an assigned structural group already.
- CandToGroupIt = CandToGroup.find(&*CandIt);
- if (CandToGroupIt == CandToGroup.end()) {
- // If not, we assign it one, and add it to our mapping.
- std::tie(CandToGroupIt, Inserted) =
- CandToGroup.insert(std::make_pair(&*CandIt, CurrentGroupNum++));
- }
+ // If not, we assign it one, and add it to our mapping.
+ std::tie(CandToGroupIt, Inserted) =
+ CandToGroup.try_emplace(&*CandIt, CurrentGroupNum);
+ if (Inserted)
+ ++CurrentGroupNum;
// Get the structural group number from the iterator.
OuterGroupNum = CandToGroupIt->second;
``````````
</details>
https://github.com/llvm/llvm-project/pull/140691
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