From f41916e75dc9c622fa81b91eb6a5e0a36fa13754 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 11 Feb 2007 01:04:09 +0000
Subject: [PATCH] add an optimization for the case where the src has no name

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34174 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/Value.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/VMCore/Value.cpp b/lib/VMCore/Value.cpp
index af753236c1d..30ca5c35b5f 100644
--- a/lib/VMCore/Value.cpp
+++ b/lib/VMCore/Value.cpp
@@ -141,6 +141,12 @@ void Value::setName(const std::string &name) {
 /// takeName - transfer the name from V to this value, setting V's name to
 /// empty.  It is an error to call V->takeName(V). 
 void Value::takeName(Value *V) {
+  if (!V->hasName()) {
+    if (hasName())
+      setName("");
+    return;
+  }
+  
   std::string Name = V->getName();
   V->setName("");
   setName(Name);