[Beignet] [BUG] kernel fails at the backend

[Zhigang Gong]

I just pushed a patch to fix this bug. Could you try your original case without
modification? Thanks.

On Tue, Oct 08, 2013 at 05:02:09PM +0800, Zhigang Gong wrote:
> On Sun, Oct 06, 2013 at 01:30:15AM -0400, Matt Harvey wrote:
> > Hi
> > 
> > I'm having trouble and was wondering if you guys had any insight. This
> > simple kernel:
> > __constant sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE |
> > CLK_ADDRESS_CLAMP_TO_EDGE | CLK_FILTER_NEAREST;
> 
> Try to change the above statement to:
> const sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_CLAMP_TO_EDGE | CLK_FILTER_NEAREST;
> 
> > 
> > __kernel void edge_detect(__read_only image2d_t image_in,
> >                         __write_only image2d_t image_out)
> > {
> >     const int2 pos = { get_global_id(0), get_global_id(1) };
> >     //make this a pass through
> >     float4 data = read_imagef(image_in, sampler, pos);
> >     write_imagef(image_out, pos, data);
> > }
> > 
> > Fails after compilation with this error message:
> > ASSERTION FAILED: arg != NULL
> >   at file /media/matto/Programming/src/beignet/backend/src/ir/sampler.cpp,
> > function void gbe::ir::SamplerSet::append(gbe::ir::Register,
> > gbe::ir::Context*), line 60
> > Stack dump:
> > 0. Running pass 'Function Pass Manager' on module '/tmp/fileB926yJ.ll'.
> > 1. Running pass 'Gen Back-End' on function '@edge_detect'
> 
> It seems that for the __constant/constant qualifier, the compiler
> will not do constant propagation. The only worked qualifier for sampler_t
> is const, if you want to define it in the kernel. We will fix this problem
> in the futuer, before that, you can use const as a workaround.
> 
> Thanks for reporting this bug.
> 
> > 
> > This looks like a bug to me.
> > 
> > Any ideas?
> > 
> > Thanks
> 
> > _______________________________________________
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> > Beignet at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/beignet
> 
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