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c3187b408e
Summary: Fix a compiler bug when the lane select happens to end up in a VGPR. Clarify the semantic of the corresponding intrinsic to be that of the corresponding GLSL: the lane select must be uniform across a wave front, otherwise results are undefined. Reviewers: arsenm Subscribers: kzhuravl, wdng, yaxunl, dstuttard, tpr, t-tye, llvm-commits Differential Revision: https://reviews.llvm.org/D32343 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301197 91177308-0d34-0410-b5e6-96231b3b80d8