[llvm] 8d333e1 - [SelectionDAG] Avoid repeated hash lookups (NFC) (#131266)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-03-14T07:21:34-07:00
New Revision: 8d333e167503e7ca17ab9e54b8a07cc3b55f96ca

URL: https://github.com/llvm/llvm-project/commit/8d333e167503e7ca17ab9e54b8a07cc3b55f96ca
DIFF: https://github.com/llvm/llvm-project/commit/8d333e167503e7ca17ab9e54b8a07cc3b55f96ca.diff

LOG: [SelectionDAG] Avoid repeated hash lookups (NFC) (#131266)

Added: 
    

Modified: 
    llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
index 987ea826f782e..735dcef8c28bf 100644
--- a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
@@ -889,7 +889,8 @@ SDValue SelectionDAGBuilder::LowerAsSTATEPOINT(
     }
 
     // Handle multiple gc.relocates of the same input efficiently.
-    if (VirtRegs.count(SD))
+    auto [VRegIt, Inserted] = VirtRegs.try_emplace(SD);
+    if (!Inserted)
       continue;
 
     auto *RetTy = Relocate->getType();
@@ -900,7 +901,7 @@ SDValue SelectionDAGBuilder::LowerAsSTATEPOINT(
     RFV.getCopyToRegs(Relocated, DAG, getCurSDLoc(), Chain, nullptr);
     PendingExports.push_back(Chain);
 
-    VirtRegs[SD] = Reg;
+    VRegIt->second = Reg;
   }
 
   // Record for later use how each relocation was lowered.  This is needed to