[PATCH] D154210: AMDGPU: Add some notes about amdgpu-flat-work-group-size

[Yaxun Liu via Phabricator via llvm-commits]

yaxunl added inline comments.


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Comment at: llvm/docs/AMDGPUUsage.rst:989
                                              by the ``amdgpu_flat_work_group_size`` CLANG attribute [CLANG-ATTR]_.
-                                             The implied default value is 1,1024.
+                                             The implied default value is 1,1024. The behavior is
+                                             undefined if the number of logically active lanes
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Clang always adds this function attribute to the kernel. The implicit default value specified by Clang is 1,256 for OpenCL and 1,1024 for HIP.


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https://reviews.llvm.org/D154210