I tried Peter's code in a Tesla C2070 and got the same problems.
This is what I tried:
- The PTX specification says that "Support for generic addressing of .const
space added in PTX ISA version 3.1.", so I tried to use .version 3.1
- set in options CU_TARGET_COMPUTE_20 and 32 as register size
I also found this source which gives the same error, so I suppose these
guys may be getting the same problem?
http://code.google.com/p/gpuocelot/source/browse/trunk/tests/ptx/synthetic/ptr-declaration.ptx?spec=svn2035&r=2035
Victor
On Fri, Mar 22, 2013 at 9:41 PM, Chuck Zhao <[email protected]> wrote:
> If it possible we give this PTX code to nVidia, and ask them when it can
> be supported?
> Not sure if it is a bug on the nVidia's side, or it is leftout
> intentionally.
>
> Chuck
>
> On 3/22/2013 5:22 PM, Peter Colberg wrote:
> > On Sat, Mar 23, 2013 at 01:55:30AM +0200, Pekka Jääskeläinen wrote:
> >> Also, the kernel uses "automatic locals" in contrast to the
> >> "host allocated" kernel local args, if that makes any difference.
> > That is the point. Automatic local memory arrays (with static size)
> > are supported by both CUDA and OpenCL, so in this case cuModuleLoad*
> > will have no problem loading PTX generated from OpenCL using LLVM
> > NVPTX.
> >
> > The issue is local and constant memory passed by parameter. The CUDA
> > driver rejects these cases, despite supporting them in OpenCL.
> >
> > This gives the impression that the real issue with this pocl backend
> > will not be the LLVM NVPTX backend, but the CUDA driver, which is
> > outside the realm of LLVM. In the above case, the CUDA driver rejects
> > valid PTX code without giving any reason.
> >
> > Peter
> >
> >
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