[Beignet] [BUG] kernel fails at the backend

[Matt Harvey]

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;

__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'

This looks like a bug to me.

Any ideas?

Thanks
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