From b58c08b0ba5d0163111d4b7454a3d968d86c3ece Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Wed, 23 Jun 2010 16:07:42 +0000
Subject: Some targets don't require the fencing MEMBARRIER instructions
 surrounding atomic intrinsics, either because the use locking instructions
 for the atomics, or because they perform the locking directly. Add support in
 the DAG combiner to fold away the fences.

llvm-svn: 106630
---
 llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp')

diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 945cbbb6cce..bfd689b4d1e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -581,6 +581,7 @@ TargetLowering::TargetLowering(const TargetMachine &tm,
   IfCvtBlockSizeLimit = 2;
   IfCvtDupBlockSizeLimit = 0;
   PrefLoopAlignment = 0;
+  ShouldFoldAtomicFences = false;
 
   InitLibcallNames(LibcallRoutineNames);
   InitCmpLibcallCCs(CmpLibcallCCs);
-- 
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