[Beignet] Combine Loads from __constant space

[Tony Moore]

Hello,
I notice that reads are not being combined when I use __constant on a
read-only kernel buffer. Is this something that can be improved?

In my kernel there are many loads from a read-only data structure. When I
use the __global specifier for the memory space I see a total of 33 send
instructions and a runtime of 81ms. When I use the __constant specifier, I
see 43 send instructions and a runtime of 40ms. I'm hoping that combining
the loads could improve performance further.

thanks!
tony
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