[PATCH,PTX] Add support for CUDA 9

[Cesar Philippidis]

On 12/19/2017 04:39 PM, Tom de Vries wrote:
> On 12/20/2017 12:25 AM, Cesar Philippidis wrote:
>> In CUDA 9, Nvidia removed support for treating the labels of functions
>> as generic address spaces as part of their PTX 6.0 changes. More
>> specifically,
>> <http://docs.nvidia.com/cuda/parallel-thread-execution/index.html#changes-in-ptx-isa-version-6-0>:
>>
>>
>> Â Â  Support for taking address of labels, using labels in initializers
>> Â Â  which was unimplemented has been removed from the spec.
>>
>> Despite targeting PTX 3.0, the ptxas assembler shipped with CUDA 9 no
>> longer support that legacy functionality. Consequently, this prevented
>> newlib from building. This patch fixes that problem by not using a
>> generic address space when initializing variables using a label address.
>>
> 
> What is the effect for pre-9.0 cudas?

No change in the libgomp execution test suite as an accelerator.

>> Is this OK for trunk?
>>
> 
> How did you test this?

Just libgomp as an accelerator for now. I'm trying to get standalone
nvptx working right now. Which testsuites do you usually run? I only see
the test results for check-gcc-c in your nightly build bot.

By the way, do you know what caused the recent nvptx breakage in trunk?

Cesar