[llvm] [Local] Avoid repeated map lookups (NFC) (PR #113072)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/113072.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Utils/Local.cpp (+3-3) 


``````````diff
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 06813bac7c781f..65c1669f92b4d3 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -3840,11 +3840,11 @@ static const std::optional<BitPart> &
 collectBitParts(Value *V, bool MatchBSwaps, bool MatchBitReversals,
                 std::map<Value *, std::optional<BitPart>> &BPS, int Depth,
                 bool &FoundRoot) {
-  auto I = BPS.find(V);
-  if (I != BPS.end())
+  auto [I, Inserted] = BPS.try_emplace(V);
+  if (!Inserted)
     return I->second;
 
-  auto &Result = BPS[V] = std::nullopt;
+  auto &Result = I->second;
   auto BitWidth = V->getType()->getScalarSizeInBits();
 
   // Can't do integer/elements > 128 bits.

``````````

</details>


https://github.com/llvm/llvm-project/pull/113072