[PATCH] D139730: [OpenMP][DeviceRTL][AMDGPU] Support code object version 5

Fri Aug 4 12:42:42 PDT 2023

arsenm added a comment.

In D139730#4561619 <https://reviews.llvm.org/D139730#4561619>, @arsenm wrote:

> In D139730#4561575 <https://reviews.llvm.org/D139730#4561575>, @jhuber6 wrote:
>
>> In D139730#4561573 <https://reviews.llvm.org/D139730#4561573>, @arsenm wrote:
>>
>>> In D139730#4561540 <https://reviews.llvm.org/D139730#4561540>, @jhuber6 wrote:
>>>
>>>> Could you explain briefly what the approach here is? I'm confused as to what's actually changed and how we're handling this difference. I thought if this was just the definition of some builtin function we could just rely on the backend to figure it out. Why do we need to know the code object version inside the device RTL?
>>>
>>> The build is called in the device rtl, so the device RTL needs to contain both implementations. The "backend figuring it out" is dead code elimination
>>
>> Okay, do we expect to re-use this interface anywhere? If it's just for OpenMP then we should probably copy the approach taken for `__omp_rtl_debug_kind`, which is a global created on the GPU by `CGOpenMPRuntimeGPU`'s constructor and does more or less the same thing.
>
> device libs replicates the same scheme using its own copy of an equivalent variable. Trying to merge those two together

Although I guess that doesn't really need the builtin changes?

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