[Bug 89058] [SKL]Render error in some games (etqw-demo, nexuiz, portal)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89058

--- Comment #26 from Neil Roberts <neil at linux.intel.com> ---
Ok, I think the thing about the src and dst registers overlapping is a red
herring. I can replicate the bug on Haswell by modifying commit 5a06ee7384934f
to apply on Gen7, but without setting the SIMD4x2 bit in the header. It also
has the bug if I leave it so that allocates register space for the header but
doesn't actually send the header which means the registers are no longer
overlapping. It seems like it's just the compiler going wrong somehow but if I
compare the working one and the non-working one so far I haven't seen anything
that looks wrong.

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