[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 #3 from Matt Turner <mattst88 at gmail.com> ---
(In reply to Kenneth Graunke from comment #2)
> 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.

Oh, that's awesome. It's seeing writes to all 4 channels of register 4.
Register 4 just happens to be in different register files!

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