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8e2b2ae80e
Summary: hwsync is only required for seq_cst fences, acquire and release one can use the cheaper lwsync. Test Plan: Added some cases to atomics.ll + make check-all Reviewers: jfb, wschmidt Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D5317 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218995 91177308-0d34-0410-b5e6-96231b3b80d8
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