[llvm] 26c486c - [TableGen] RegisterBankEmitter - Pass Twine by const reference instead of by value. NFCI.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2021-01-06T14:22:05Z
New Revision: 26c486c2eb1a0f302eb60a4b959456f09adbbacb

URL: https://github.com/llvm/llvm-project/commit/26c486c2eb1a0f302eb60a4b959456f09adbbacb
DIFF: https://github.com/llvm/llvm-project/commit/26c486c2eb1a0f302eb60a4b959456f09adbbacb.diff

LOG: [TableGen] RegisterBankEmitter - Pass Twine by const reference instead of by value. NFCI.

Added: 
    

Modified: 
    llvm/utils/TableGen/RegisterBankEmitter.cpp

Removed: 
    


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diff  --git a/llvm/utils/TableGen/RegisterBankEmitter.cpp b/llvm/utils/TableGen/RegisterBankEmitter.cpp
index 6a45213e1d66..0725657150f8 100644
--- a/llvm/utils/TableGen/RegisterBankEmitter.cpp
+++ b/llvm/utils/TableGen/RegisterBankEmitter.cpp
@@ -168,7 +168,7 @@ void RegisterBankEmitter::emitBaseClassDefinition(
 ///                to the class.
 static void visitRegisterBankClasses(
     const CodeGenRegBank &RegisterClassHierarchy,
-    const CodeGenRegisterClass *RC, const Twine Kind,
+    const CodeGenRegisterClass *RC, const Twine &Kind,
     std::function<void(const CodeGenRegisterClass *, StringRef)> VisitFn,
     SmallPtrSetImpl<const CodeGenRegisterClass *> &VisitedRCs) {
 
@@ -182,7 +182,7 @@ static void visitRegisterBankClasses(
 
   for (const auto &PossibleSubclass : RegisterClassHierarchy.getRegClasses()) {
     std::string TmpKind =
-        (Twine(Kind) + " (" + PossibleSubclass.getName() + ")").str();
+        (Kind + " (" + PossibleSubclass.getName() + ")").str();
 
     // Visit each subclass of an explicitly named class.
     if (RC != &PossibleSubclass && RC->hasSubClass(&PossibleSubclass))