[Pkg-opencl-devel] Bug#759707: beignet: New upstream version

[Rebecca N. Palmer]

0.9.3 usually passes all its tests with 2 warnings:
double_precision_check()
   - WARN: GPU doesn't have correct double precision. Got 9.995699E-05, 
expected 0.0001000001
     [SUCCESS]
test_printf()Warning: Have a int parameter for %f like specifier, take 
care of it
it once failed one test (not sure if it was runtime_barrier_list() or 
runtime_marker_list(): race condition?), but usually passes that one. 
This is better than 0.8, which always fails builtin_{cospi,erf,erfc, 
nextafter,pow,pown,powr,rootn,sinpi,tanpi,tgamma}_float{,2,4,8,16}() and 
often crashes with a bus error on sub_buffer_check().

My beignet_test script (see #767148) finds that multiplication is ~1.5x 
faster in 0.9.3 than in 0.8, and cos+sin+sqrt ~25x (!) faster but less 
accurate.  The test suite takes 41-45s on 0.9.3 and 46-48s on 0.8, but 
probably isn't the best speed measure.

It would be easy to create an 0.8+dfsg1-1 that just fixed the two RC 
bugs and would be allowed under freeze, but given the above, and that 
new hardware needs new beignet versions (0.8 is Ivy Bridge _only_, 
nothing newer), it may make more sense to accept removal from jessie and 
provide a regularly-updated version in jessie-backports.

> At least the code that decides that beignet is not supported on the
> platform should be compiled without these switches.
That's at least src/cl_api.c, src/cl_device_id.c, 
src/intel/intel_driver.c (from when I added that error return: #745363).