[Openmp-commits] [PATCH] D101976: [OpenMP] Unified entry point for SPMD & generic kernels in the device RTL

[Johannes Doerfert via Phabricator via Openmp-commits]

jdoerfert added a comment.

In D101976#2742166 <https://reviews.llvm.org/D101976#2742166>, @JonChesterfield wrote:

> What are the required semantics of the barrier operations? Amdgcn builds them on shared memory, so probably needs a change to the corresponding target_impl to match

I have *not* tested AMDGCN but I was not expecting a problem. The semantics I need here is: 
 warp N, thread     0 hits a barrier instruction I0
 warp N, threads 1-31 hit  a barrier instruction I1
 the entire warp synchronizes and moves on.


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