[llvm] b0e43f8 - [TableGen] Avoid repeated hash lookups (NFC) (#120873)

[via llvm-commits]

Author: Kazu Hirata
Date: 2024-12-22T01:30:27-08:00
New Revision: b0e43f815ac69eaab503984a187d8099b5c4b707

URL: https://github.com/llvm/llvm-project/commit/b0e43f815ac69eaab503984a187d8099b5c4b707
DIFF: https://github.com/llvm/llvm-project/commit/b0e43f815ac69eaab503984a187d8099b5c4b707.diff

LOG: [TableGen] Avoid repeated hash lookups (NFC) (#120873)

Added: 
    

Modified: 
    llvm/utils/TableGen/CallingConvEmitter.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/utils/TableGen/CallingConvEmitter.cpp b/llvm/utils/TableGen/CallingConvEmitter.cpp
index 444b10719cb034..b315aa7d86fe91 100644
--- a/llvm/utils/TableGen/CallingConvEmitter.cpp
+++ b/llvm/utils/TableGen/CallingConvEmitter.cpp
@@ -378,10 +378,11 @@ void CallingConvEmitter::emitArgRegisterLists(raw_ostream &O) {
         const std::string &InnerCCName = InnerEntry.first;
         std::set<std::string> &InnerRegisters = InnerEntry.second;
 
-        if (InnerRegisters.find(CCName) != InnerRegisters.end()) {
-          AssignedRegsMap[InnerCCName].insert(AssignedRegsMap[CCName].begin(),
-                                              AssignedRegsMap[CCName].end());
-          InnerRegisters.erase(CCName);
+        auto It = InnerRegisters.find(CCName);
+        if (It != InnerRegisters.end()) {
+          const auto &Src = AssignedRegsMap[CCName];
+          AssignedRegsMap[InnerCCName].insert(Src.begin(), Src.end());
+          InnerRegisters.erase(It);
         }
       }