llvm dev - Mar 2012 - [LLVMdev] GPU thread/block/grid size contraints in LLVM PTX backend

I am wondering that how does the LLVM PTX backend find out the
constraints on executing GPU thread/block/grid size ( i.e. a block can
at most have 1024 threads). Can anyone point me to the code ? I need
information in the optimizer,  how can I get it ?

Thanks

Xin

You specify shader model, bit size and etc. arch-specified parameters
though -march, -mattr and -mcpu, but AFAIK, PTX backend does not use
the GPU thread/block/grid size information in optimization yet.

On Mon, Mar 12, 2012 at 8:17 PM, Xin Tong <xerox.time.tech at gmail.com>
wrote:
> I am wondering that how does the LLVM PTX backend find out the
> constraints on executing GPU thread/block/grid size ( i.e. a block can
> at most have 1024 threads). Can anyone point me to the code ? I need
> information in the optimizer,  how can I get it ?
>
> Thanks
>
> Xin
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

but does it have default values ?

Thanks

Xin

On Tue, Mar 13, 2012 at 5:19 AM, Che-Liang Chiou <clchiou at gmail.com>
wrote:
> You specify shader model, bit size and etc. arch-specified parameters
> though -march, -mattr and -mcpu, but AFAIK, PTX backend does not use
> the GPU thread/block/grid size information in optimization yet.
>
> On Mon, Mar 12, 2012 at 8:17 PM, Xin Tong <xerox.time.tech at
gmail.com> wrote:
>> I am wondering that how does the LLVM PTX backend find out the
>> constraints on executing GPU thread/block/grid size ( i.e. a block can
>> at most have 1024 threads). Can anyone point me to the code ? I need
>> information in the optimizer,  how can I get it ?
>>
>> Thanks
>>
>> Xin
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev