[SLP] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-llvm-transforms

@llvm/pr-subscribers-vectorizers

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/115428.diff

1 Files Affected:

• (modified) llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp (+3-4)

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index b2f677fb84f983..782b5dc05f8791 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -2241,10 +2241,9 @@ class BoUpSLP {
           HashMap[NumFreeOpsHash.Hash] = std::make_pair(1, Lane);
         } else if (NumFreeOpsHash.NumOfAPOs == Min &&
                    NumFreeOpsHash.NumOpsWithSameOpcodeParent == SameOpNumber) {
-          auto *It = HashMap.find(NumFreeOpsHash.Hash);
-          if (It == HashMap.end())
-            HashMap[NumFreeOpsHash.Hash] = std::make_pair(1, Lane);
-          else
+          auto [It, Inserted] =
+              HashMap.try_emplace(NumFreeOpsHash.Hash, 1, Lane);
+          if (!Inserted)
             ++It->second.first;
         }
       }

[nikic]

LG