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When using libcall expansions for the atomic intrinsics, the explicit

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MEMBARRIER fences aren't necessary for ARM. Tell the combiner to fold them
away.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106631 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-06-23 16:08:49 +00:00
parent 9a526495e0
commit 5def57aaf4
1 changed files with 2 additions and 0 deletions
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2
lib/Target/ARM/ARMISelLowering.cpp
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@ -441,6 +441,8 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i8, Expand);
setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i16, Expand);
setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i32, Expand);
// Since the libcalls include locking, fold in the fences
setShouldFoldAtomicFences(true);
}
// 64-bit versions are always libcalls (for now)
setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i64, Expand);