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* [AMDGPU] Eliminate barrier if workgroup size is not greater than wavefront sizeStanislav Mekhanoshin2017-04-061-0/+30
If a workgroup size is known to be not greater than wavefront size the s_barrier instruction is not needed since all threads are guarantied to come to the same point at the same time. Differential Revision: https://reviews.llvm.org/D31731 llvm-svn: 299659
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