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Summary: So it appears that to guarantee some of the ordering requirements of a GLSL memoryBarrier() executed in the shader, we need to emit an s_waitcnt. (We can't use an s_barrier, because memoryBarrier() may appear anywhere in the shader, in particular it may appear in non-uniform control flow.) Reviewers: arsenm, mareko, tstellarAMD Subscribers: arsenm, llvm-commits Differential Revision: http://reviews.llvm.org/D19203 llvm-svn: 267729
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