[llvm] d1700cd - [ExecutionEngine] Avoid repeated hash lookups (NFC) (#131423)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-03-15T09:12:23-07:00
New Revision: d1700cdbf2740b65ccdeefe0fff4837977c8e6a6

URL: https://github.com/llvm/llvm-project/commit/d1700cdbf2740b65ccdeefe0fff4837977c8e6a6
DIFF: https://github.com/llvm/llvm-project/commit/d1700cdbf2740b65ccdeefe0fff4837977c8e6a6.diff

LOG: [ExecutionEngine] Avoid repeated hash lookups (NFC) (#131423)

Added: 
    

Modified: 
    llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp

Removed: 
    


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diff  --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp
index 69e95654666e1..16ec136480cba 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp
@@ -86,17 +86,17 @@ uint64_t RuntimeDyldCOFF::getDLLImportOffset(unsigned SectionID, StubMap &Stubs,
          "Not a DLLImport symbol?");
   RelocationValueRef Reloc;
   Reloc.SymbolName = Name.data();
-  auto I = Stubs.find(Reloc);
-  if (I != Stubs.end()) {
-    LLVM_DEBUG(dbgs() << format("{0:x8}", I->second) << "\n");
-    return I->second;
+  auto [It, Inserted] = Stubs.try_emplace(Reloc);
+  if (!Inserted) {
+    LLVM_DEBUG(dbgs() << format("{0:x8}", It->second) << "\n");
+    return It->second;
   }
 
   assert(SectionID < Sections.size() && "SectionID out of range");
   auto &Sec = Sections[SectionID];
   auto EntryOffset = alignTo(Sec.getStubOffset(), PointerSize);
   Sec.advanceStubOffset(EntryOffset + PointerSize - Sec.getStubOffset());
-  Stubs[Reloc] = EntryOffset;
+  It->second = EntryOffset;
 
   RelocationEntry RE(SectionID, EntryOffset, PointerReloc, 0, false,
                      Log2_64(PointerSize));