radeonsi: LLVM r187139 broke some piglit tests

[Michel Dänzer]

LLVM revision 187139 ('Allocate local registers in order for optimal
coloring.') broke some derivative related piglit tests with the radeonsi
driver. 

I'm attaching a diff between the bad and good generated code (as printed
with RADEON_DUMP_SHADERS=1) for the glsl-derivs test. The only
difference I can see is in which registers are used in which order.

I wonder if we might be missing S_WAITCNT after DS_READ/WRITE
instructions in some cases, but I haven't spotted any candidates for
that in the bad code which aren't there in the good code as well. Can
anyone else spot something I've missed?

Any other ideas?


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer
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