[Openmp-commits] [PATCH] D44186: [OpenMP] New clang/libomptarget map interface: remove translation code

George Rokos via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Wed Mar 7 09:16:25 PST 2018

grokos added inline comments.

Comment at: libomptarget/src/omptarget.cpp:197-199
+    // Adjust for proper alignment if this is a combined entry (for structs).
+    // Look at the next argument - if that is MEMBER_OF this one, then this one
+    // is a combined entry.
Hahnfeld wrote:
> grokos wrote:
> > Hahnfeld wrote:
> > > I thought this is now done in the compiler?
> > No, it's not. The compiler could take care of this issue, but it's not its job. The compiler should just inform the runtime that we requested a mapping starting from some address. If `CUDA memcpy`, for instance, has some requirements regarding the alignment of addresses, that's not the compiler's business. The compiler doesn't and shouldn't care about what happens at the plugin level of libomptarget.
> If that's specific to CUDA, why does it happen in the plugin agnostic part of libomptarget?
That's a good point. A more elegant solution would be to extend the plugin interface (`__tgt_rtl_*` functions) with a new function which the agnostic library can query in order to get any alignment requirements. I'm in favour of this approach, but I need to ask other people what they think. In any case, implementing this potential change is not part of this patch. Thoughts?

  rOMP OpenMP


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