From 5f5bcaec051fc4383d763e0be8ef2c866b841fdb Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Mon, 3 Mar 2025 07:43:18 -0800
Subject: [PATCH] [TableGen] Avoid repeated hash lookups (NFC)

---
 .../TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp      | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp b/llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp
index 21db090f62cce..4c809b4016cbd 100644
--- a/llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp
+++ b/llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.cpp
@@ -834,7 +834,9 @@ Error RuleMatcher::defineComplexSubOperand(StringRef SymbolicName,
                                            unsigned SubOperandID,
                                            StringRef ParentSymbolicName) {
   std::string ParentName(ParentSymbolicName);
-  if (ComplexSubOperands.count(SymbolicName)) {
+  auto [It, Inserted] = ComplexSubOperands.try_emplace(
+      SymbolicName, ComplexPattern, RendererID, SubOperandID);
+  if (!Inserted) {
     const std::string &RecordedParentName =
         ComplexSubOperandsParentName[SymbolicName];
     if (RecordedParentName != ParentName)
@@ -847,7 +849,6 @@ Error RuleMatcher::defineComplexSubOperand(StringRef SymbolicName,
     return Error::success();
   }
 
-  ComplexSubOperands[SymbolicName] = {ComplexPattern, RendererID, SubOperandID};
   ComplexSubOperandsParentName[SymbolicName] = std::move(ParentName);
 
   return Error::success();