roastduck commented on pull request #5382:
URL: https://github.com/apache/incubator-tvm/pull/5382#issuecomment-620456420


   @wpan11nv Could you explain how subgroups in OpenCL works? Up to now, we 
always assumed `threadIdx.x` equals to warp in the `lower_warp_memory` pass. 
Does it mean there are more problems with `lower_warp_memory` for OpenCL?


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