[llvm] 9a4bf98 - [X86] Avoid repeated hash lookups (NFC) (#127579)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-02-18T08:40:28-08:00
New Revision: 9a4bf985f8e920704c4da12f2db0caeebc25a0a3

URL: https://github.com/llvm/llvm-project/commit/9a4bf985f8e920704c4da12f2db0caeebc25a0a3
DIFF: https://github.com/llvm/llvm-project/commit/9a4bf985f8e920704c4da12f2db0caeebc25a0a3.diff

LOG: [X86] Avoid repeated hash lookups (NFC) (#127579)

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp b/llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp
index 31a93f9c2a6ef..c9e495c1eba1f 100644
--- a/llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp
+++ b/llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp
@@ -339,10 +339,10 @@ X86LoadValueInjectionLoadHardeningPass::getGadgetGraph(
   DenseMap<MachineInstr *, GraphIter> NodeMap;
   int FenceCount = 0, GadgetCount = 0;
   auto MaybeAddNode = [&NodeMap, &Builder](MachineInstr *MI) {
-    auto Ref = NodeMap.find(MI);
-    if (Ref == NodeMap.end()) {
+    auto [Ref, Inserted] = NodeMap.try_emplace(MI);
+    if (Inserted) {
       auto I = Builder.addVertex(MI);
-      NodeMap[MI] = I;
+      Ref->second = I;
       return std::pair<GraphIter, bool>{I, true};
     }
     return std::pair<GraphIter, bool>{Ref->getSecond(), false};