[llvm] [Analysis] Simplify code with DenseMap::operator[] (NFC) (PR #111331)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/111331.diff


3 Files Affected:

- (modified) llvm/lib/Analysis/BasicAliasAnalysis.cpp (+2-4) 
- (modified) llvm/lib/Analysis/LoopAccessAnalysis.cpp (+2-4) 
- (modified) llvm/lib/Analysis/ScalarEvolution.cpp (+1-2) 


``````````diff
diff --git a/llvm/lib/Analysis/BasicAliasAnalysis.cpp b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
index f471c0db11d3ef..1dcdad01f4c809 100644
--- a/llvm/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/llvm/lib/Analysis/BasicAliasAnalysis.cpp
@@ -219,10 +219,8 @@ bool EarliestEscapeInfo::isNotCapturedBefore(const Value *Object,
     Instruction *EarliestCapture = FindEarliestCapture(
         Object, *const_cast<Function *>(DT.getRoot()->getParent()),
         /*ReturnCaptures=*/false, /*StoreCaptures=*/true, DT);
-    if (EarliestCapture) {
-      auto Ins = Inst2Obj.insert({EarliestCapture, {}});
-      Ins.first->second.push_back(Object);
-    }
+    if (EarliestCapture)
+      Inst2Obj[EarliestCapture].push_back(Object);
     Iter.first->second = EarliestCapture;
   }
 
diff --git a/llvm/lib/Analysis/LoopAccessAnalysis.cpp b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
index fe00ea0097a43a..d35bf6818d4379 100644
--- a/llvm/lib/Analysis/LoopAccessAnalysis.cpp
+++ b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
@@ -512,10 +512,8 @@ void RuntimePointerChecking::groupChecks(
   unsigned TotalComparisons = 0;
 
   DenseMap<Value *, SmallVector<unsigned>> PositionMap;
-  for (unsigned Index = 0; Index < Pointers.size(); ++Index) {
-    auto [It, _] = PositionMap.insert({Pointers[Index].PointerValue, {}});
-    It->second.push_back(Index);
-  }
+  for (unsigned Index = 0; Index < Pointers.size(); ++Index)
+    PositionMap[Pointers[Index].PointerValue].push_back(Index);
 
   // We need to keep track of what pointers we've already seen so we
   // don't process them twice.
diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index c939270ed39a65..3d890f05c8ca21 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -1564,8 +1564,7 @@ static void insertFoldCacheEntry(
     UserIDs.pop_back();
     I.first->second = S;
   }
-  auto R = FoldCacheUser.insert({S, {}});
-  R.first->second.push_back(ID);
+  FoldCacheUser[S].push_back(ID);
 }
 
 const SCEV *

``````````

</details>


https://github.com/llvm/llvm-project/pull/111331