[Bug 101984] [BSW BXT BYT] piglit.spec.arb_shader_ballot.execution.fs-readinvocation-uint broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101984

--- Comment #1 from Matt Turner <mattst88 at gmail.com> ---
I looked at this with Curro a few weeks ago, and we noticed that commenting out 

  if ((active_set & (1ul << i)) == 0ul)
     continue;

makes the test pass.

Poking a little at it, I think the cause is

shl(8)          g8<1>Q          g4<4,4,1>Q      g2<4,4,1>UD     { align1 1Q };

CHV/BXT require that the "Source and Destination horizontal stride must be
aligned to the same qword." for 64-bit operations.

I'll see if fixing that sorts this out.

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