[llvm] 6ec113d - [Local] Avoid repeated map lookups (NFC) (#113072)

[via llvm-commits]

Author: Kazu Hirata
Date: 2024-10-20T09:06:22-07:00
New Revision: 6ec113d4c35db934ec8fdb3d226d2d8e525a1f84

URL: https://github.com/llvm/llvm-project/commit/6ec113d4c35db934ec8fdb3d226d2d8e525a1f84
DIFF: https://github.com/llvm/llvm-project/commit/6ec113d4c35db934ec8fdb3d226d2d8e525a1f84.diff

LOG: [Local] Avoid repeated map lookups (NFC) (#113072)

Added: 
    

Modified: 
    llvm/lib/Transforms/Utils/Local.cpp

Removed: 
    


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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.