[Bug 104297] [i965] Downward causes GPU hangs and misrendering on Haswell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104297

--- Comment #40 from Kenneth Graunke <kenneth at whitecape.org> ---
(In reply to Danylo from comment #39)
> Created attachment 143012 [details]
> Shader test to reporduce TCS vec4 issue

For what it's worth, hacking the DEBUG_SPILL_VEC4 code to do:

         if (no_spill[i] || i != 42)                            
            continue;

will still reproduce the problem on Kabylake with INTEL_SCALAR_TCS=0
INTEL_DEBUG=spill_vec4, but it only spills and fills a single register.  That
spill/fill appears to be working in the simulator, too - the value read back
matches the value written.

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