From 6f05a743f7c5101876b27d30d20f653ca21de6b4 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Fri, 22 Sep 2017 13:32:26 +0000
Subject: [TableGen] Return StringRef from ValueTypeByHwMode::getMVTName

Avoid unnecessary std::string creations during TypeSetByHwMode::writeToStream.

Found during investigations into PR28222

Differential Revision: https://reviews.llvm.org/D38174

llvm-svn: 313983
---
 llvm/utils/TableGen/InfoByHwMode.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'llvm/utils/TableGen/InfoByHwMode.h')

diff --git a/llvm/utils/TableGen/InfoByHwMode.h b/llvm/utils/TableGen/InfoByHwMode.h
index 71149e8da19..57640fc3025 100644
--- a/llvm/utils/TableGen/InfoByHwMode.h
+++ b/llvm/utils/TableGen/InfoByHwMode.h
@@ -129,7 +129,7 @@ struct ValueTypeByHwMode : public InfoByHwMode<MVT> {
   MVT getType(unsigned Mode) const { return get(Mode); }
   MVT &getOrCreateTypeForMode(unsigned Mode, MVT Type);
 
-  static std::string getMVTName(MVT T);
+  static StringRef getMVTName(MVT T);
   std::string getAsString() const;
   void dump() const;
 };
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