tra added a comment.

The latest version of the patch works well enough to compile tensorflow. That's 
the good news.

In D79526#2026857 <https://reviews.llvm.org/D79526#2026857>, @yaxunl wrote:

> Looks like we went overboard to treat implicit host device candidate as 
> inferior. They should be treated
>  as inferior in device compilation, not in host compilation. Here because 
> they are treated as inferior
>  to same-sided candidate in host compilation, they changed overload 
> resolution in host compilation
>  therefore caused the failure in host compilation.
>
> I have updated the patch to treat implicit host device candidate as inferior 
> in device compilation.


I'm concerned that this creates inconsistency in how overload resolution works 
during host and device compilation.
In general they should behave the same. I.e. a test where this change is needed 
during device-side compilation will require the same change on the host side, 
if you swap H and D attributes on the functions in the test.

Speaking of tests, it would be great to add a test illustrating this scenario.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D79526/new/

https://reviews.llvm.org/D79526



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