From c23b8719ef9d6b1220e854b37d40e9e1c48a82bc Mon Sep 17 00:00:00 2001
From: Gabor Greif <ggreif@gmail.com>
Date: Wed, 4 Mar 2009 20:36:44 +0000
Subject: Give sentinel traits the right to determine the policy where the
 sentinel is kept. This should result in less indirect memory accesses, less
 dead writes and tighter code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66061 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/BasicBlock.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'include/llvm/BasicBlock.h')

diff --git a/include/llvm/BasicBlock.h b/include/llvm/BasicBlock.h
index 521815f53c..561dbb2791 100644
--- a/include/llvm/BasicBlock.h
+++ b/include/llvm/BasicBlock.h
@@ -41,6 +41,10 @@ template<> struct ilist_traits<Instruction>
     return static_cast<Instruction*>(&Sentinel);
   }
   static void destroySentinel(Instruction*) {}
+
+  Instruction *provideInitialHead() const { return createSentinel(); }
+  Instruction *ensureHead(Instruction*) const { return createSentinel(); }
+
   static iplist<Instruction> &getList(BasicBlock *BB);
   static ValueSymbolTable *getSymTab(BasicBlock *ItemParent);
   static int getListOffset();
-- 
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