From 9a526495e0c06c4014d7500788cad1929fd244d3 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106630 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/TargetLowering.cpp | 1 +
 1 file changed, 1 insertion(+)

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

diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 945cbbb..bfd689b 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/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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