[Bug 87887] [i965 Bisected]ES2-CTS.gtf.GL.cos.cos_float_vert_xvary fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87887

--- Comment #2 from Kenneth Graunke <kenneth at whitecape.org> ---
It looks like opt_vector_float is just deleting writes to m4:

-mov m4.yz:F, 0.000000F
-mov m4.w:F, 1.000000F
-mov vgrf4.0.x:F, 0.500000F
+mov vgrf4.0:F, [0.5F, 0F, 0F, 1F]
 mov vgrf5.0.x:F, 0.500000F
 mul vgrf7.0.x:F, attr17.xxxx:F, 6.283185F
 cos vgrf6.0.x:F, vgrf7.xxxx:F

I haven't looked at the code to determine why (I figure I'll let Matt fix it).
I do have patches on the list to make INTEL_DEBUG=optimizer work for debugging
this.

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