[cfe-dev] [RFC][OpenMP][CUDA] Unified Offloading Support in Clang Driver

[Samuel F Antao via cfe-dev]

Hi Dmitri,

2016-02-25 6:34 GMT-05:00 Dmitry Polukhin via cfe-dev <
cfe-dev at lists.llvm.org>:

>
> On Thu, Feb 25, 2016 at 3:01 AM, Samuel F Antao via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> OpenMP (Host IR has to be read by the device to determine which
>> declarations have to be emitted and the device binary is embedded in the
>> host binary at link phase through a proper linker script):
>>
>> Src -> Host PP -> A
>>
>> A    -> HostCompile -> B
>>
>> A,B -> DeviceCompile -> C
>>
> I think even for some OpenMP targets it might be better to allow using
> device PP (and corresponding headers) due to target specific macro. For
> example, some function may have target specific version and host version
> with #ifdef's on CPU type that allows to have completely different
> implementation on host and on target.
>

I agree, the decision of using the host toolchain for a given job should be
overloaded for each toolchain and would depend on the target and the
offload kind associated.

> C    -> DeviceAssembler -> D
>>
>> E    -> DeviceLinker -> F
>>
> I suspect that you meant D instead of E here, isn't it?
>

Ups, your are totally correct! Thanks for detecting the issue.

Thanks again,
Samuel


>
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