From: Chris Lattner <sabre@nondot.org>
Date: Fri, 10 Aug 2007 06:54:38 +0000 (+0000)
Subject: small speedup in the case where a smallvector is default ctor'd from
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=02cee38647ea413e5d05f29f67a7f003db9f0081;p=oota-llvm.git

small speedup in the case where a smallvector is default ctor'd from
an empty vector.  This speeds up llc slightly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40983 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/ADT/SmallVector.h b/include/llvm/ADT/SmallVector.h
index 876ca27fec7..1c970a55981 100644
--- a/include/llvm/ADT/SmallVector.h
+++ b/include/llvm/ADT/SmallVector.h
@@ -455,7 +455,8 @@ public:
   }
   
   SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(NumTsAvailable) {
-    operator=(RHS);
+    if (!RHS.empty())
+      operator=(RHS);
   }
   
   const SmallVector &operator=(const SmallVector &RHS) {