From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Wed, 16 Sep 2009 11:43:12 +0000 (+0000)
Subject: Don't sort the vector when it is empty. This should fix some expensive checking
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f4f1b266fd83c819ea2cf7cbd9bcd377d95c4eb6;p=oota-llvm.git

Don't sort the vector when it is empty. This should fix some expensive checking
failures.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82040 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/MachineModuleInfoImpls.cpp b/lib/CodeGen/MachineModuleInfoImpls.cpp
index 10de1deec4e..7a6292910f4 100644
--- a/lib/CodeGen/MachineModuleInfoImpls.cpp
+++ b/lib/CodeGen/MachineModuleInfoImpls.cpp
@@ -38,7 +38,8 @@ MachineModuleInfoMachO::SymbolListTy
 MachineModuleInfoMachO::GetSortedStubs(const DenseMap<const MCSymbol*, 
                                                       const MCSymbol*> &Map) {
   MachineModuleInfoMachO::SymbolListTy List(Map.begin(), Map.end());
-  qsort(&List[0], List.size(), sizeof(List[0]), SortSymbolPair);
+  if (!List.empty())
+    qsort(&List[0], List.size(), sizeof(List[0]), SortSymbolPair);
   return List;
 }