azabaznov added inline comments.

================
Comment at: clang/lib/Sema/Sema.cpp:364
       for (auto &I : Atomic64BitTypes)
         setOpenCLExtensionForType(I,
             "cl_khr_int64_base_atomics cl_khr_int64_extended_atomics");
----------------
Anastasia wrote:
> I think this should be lifted into the above if statement? Although since we 
> are adding the types conditionally we could even drop this code completely 
> and let the developers just use the types as they are already added and made 
> available by the frontend.
>  I think this should be lifted into the above if statement?

No, this is needed to be here as `atomic_double` added above.

>  Although since we are adding the types conditionally we could even drop this 
> code completely and let the developers just use the types as they are already 
> added and made available by the frontend.

I'm now worried about diagnostics  with that change:

```
tmp.cl:2:17: error: expected ';' after expression
    atomic_ulong a;
                ^
                ;
tmp.cl:2:5: error: use of undeclared identifier 'atomic_ulong'
    atomic_ulong a;
    ^
tmp.cl:2:18: error: use of undeclared identifier 'a'
    atomic_ulong a;
                 ^
tmp.cl:3:5: error: unknown type name 'atomic_uintptr_t'; did you mean 
'atomic_uint'?
    atomic_uintptr_t u;
    ^~~~~~~~~~~~~~~~
    atomic_uint
note: 'atomic_uint' declared here
4 errors generated.
```
Is this expected behaviour when `cl_khr_int64_base_atomics` and 
'cl_khr_int64_extended_atomics' not supported? I think we need o be more 
careful with reserved identifiers. However,  I didn't find explicit wording 
about it, but I'm pretty sure that all of these atomic types identifiers should 
be reserved. 


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D97058/new/

https://reviews.llvm.org/D97058

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