Tim Northover 3eb87654a5 ARM: skip cmpxchg failure barrier if ordering is monotonic.
The terminal barrier of a cmpxchg expansion will be either Acquire or
SequentiallyConsistent. In either case it can be skipped if the
operation has Monotonic requirements on failure.

rdar://problem/15996804

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205535 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-03 13:06:54 +00:00
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