[llvm] [Vectorize] Simplify code with DenseMap::operator[] (NFC) (PR #113246)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-vectorizers

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/113246.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/VPlan.h (+1-2) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.h b/llvm/lib/Transforms/Vectorize/VPlan.h
index 59a084401cc9bf..e093ede496bb1f 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.h
+++ b/llvm/lib/Transforms/Vectorize/VPlan.h
@@ -291,8 +291,7 @@ struct VPTransformState {
 
   /// Set the generated scalar \p V for \p Def and the given \p Lane.
   void set(VPValue *Def, Value *V, const VPLane &Lane) {
-    auto Iter = Data.VPV2Scalars.insert({Def, {}});
-    auto &Scalars = Iter.first->second;
+    auto &Scalars = Data.VPV2Scalars[Def];
     unsigned CacheIdx = Lane.mapToCacheIndex(VF);
     if (Scalars.size() <= CacheIdx)
       Scalars.resize(CacheIdx + 1);

``````````

</details>


https://github.com/llvm/llvm-project/pull/113246