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| author | Jim Grosbach <grosbach@apple.com> | 2010-06-23 16:07:42 +0000 |
|---|---|---|
| committer | Jim Grosbach <grosbach@apple.com> | 2010-06-23 16:07:42 +0000 |
| commit | 9a526495e0c06c4014d7500788cad1929fd244d3 (patch) | |
| tree | dbab44706775e2cd8dbfcd7b8529afffa2271c93 /lib/CodeGen/SelectionDAG/TargetLowering.cpp | |
| parent | b9cd499dec44397571b682c9de3f132df2721bb5 (diff) | |
| download | external_llvm-9a526495e0c06c4014d7500788cad1929fd244d3.zip external_llvm-9a526495e0c06c4014d7500788cad1929fd244d3.tar.gz external_llvm-9a526495e0c06c4014d7500788cad1929fd244d3.tar.bz2 | |
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
Diffstat (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/TargetLowering.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
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); |