[Analysis] Avoid repeated hash lookups (NFC) #128394
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@llvm/pr-subscribers-llvm-analysis Author: Kazu Hirata (kazutakahirata) ChangesFull diff: https://github.com/llvm/llvm-project/pull/128394.diff 1 Files Affected:
diff --git a/llvm/lib/Analysis/LoopAccessAnalysis.cpp b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
index a1d91de3bb788..5988e40c56100 100644
--- a/llvm/lib/Analysis/LoopAccessAnalysis.cpp
+++ b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
@@ -1443,12 +1443,11 @@ void AccessAnalysis::processMemAccesses() {
UnderlyingObj->getType()->getPointerAddressSpace()))
continue;
- UnderlyingObjToAccessMap::iterator Prev =
- ObjToLastAccess.find(UnderlyingObj);
- if (Prev != ObjToLastAccess.end())
- DepCands.unionSets(Access, Prev->second);
+ auto [It, Inserted] =
+ ObjToLastAccess.try_emplace(UnderlyingObj, Access);
+ if (!Inserted)
+ DepCands.unionSets(Access, It->second);
- ObjToLastAccess[UnderlyingObj] = Access;
LLVM_DEBUG(dbgs() << " " << *UnderlyingObj << "\n");
}
}
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nikic
approved these changes
Feb 23, 2025
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@nikic Thanks for the review! I don't think my original PR was correct. Without my PR, we update the map in every iteration: In the latest revision, I now update the map even when the lookup succeeds. If you could review this PR again, that would be greatly appreciated. Text "LGTM" would be fine. Thanks! |
nikic
approved these changes
Feb 23, 2025
kazutakahirata
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cleanup_001_repeated_hash_lookups_llvm_Analysis
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/73/builds/13498 Here is the relevant piece of the build log for the reference |
Collaborator
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/81/builds/5045 Here is the relevant piece of the build log for the reference |
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