[cfe-dev] [RFC] Delayed target-specific diagnostic when compiling for the devices.

Alexey Bataev via cfe-dev cfe-dev at lists.llvm.org
Thu Jan 17 02:05:14 PST 2019

Best regards,
Alexey Bataev

> 17 янв. 2019 г., в 0:46, Finkel, Hal J. <hfinkel at anl.gov> написал(а):
>> On 1/16/19 8:45 AM, Alexey Bataev wrote:
>> Yes, I thought about this. But we need to delay the diagnostic until
>> the Codegen phase. What I need is the way to associate the diagnostic
>> with the function so that this diagnostic is available in CodeGen.
>> Also, we need to postpone the diagnotics not only for functions,
>> but,for example, for some types. For example, __float128 type is not
>> supported by CUDA. We can get error messages when we ran into
>> something like `typedef __float128 SomeOtherType` (say, in some system
>> header files) and get the error diagnostic when we compile for the
>> device. Though, actually, this type is not used in the device code,
>> the diagnostic is still emitted and we need to delay too and emit it
>> only iff the type is used in the device code.
> This should be fixed for CUDA too, right?
> Also, we still get to have pointers to aggregates containing those types
> on the device, right?

No, why? This is not allowed and should be diagnosed too. If somebody tries somehow to use not allowed type for the device variables/functions - it should be diagnosed.

> Thanks again,
> Hal
>> -------------
>> Best regards,
>> Alexey Bataev
>> 15.01.2019 17:33, John McCall пишет:
>>>> On 15 Jan 2019, at 17:20, Alexey Bataev wrote:
>>>> This is not only for asm, we need to delay all target-specific
>>>> diagnostics.
>>>> I'm not saying that we need to move the host diagnostic, only the
>>>> diagnostic for the device compilation.
>>>> As for Cuda, it is a little but different. In Cuda the programmer
>>>> must explicitly mark the device functions,  while in OpenMP it must
>>>> be done implicitly. Thus, we cannot reuse the solution used for Cuda.
>>> All it means is that you can't just use the solution used for CUDA
>>> "off the shelf".  The basic idea of associating diagnostics with the
>>> current function and then emitting those diagnostics later when you
>>> realize that you have to emit that function is still completely
>>> applicable.
>>> John.
> -- 
> Hal Finkel
> Lead, Compiler Technology and Programming Languages
> Leadership Computing Facility
> Argonne National Laboratory

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