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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [i965 Bisected]ES2-CTS.gtf.GL.cos.cos_float_vert_xvary fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87887#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [i965 Bisected]ES2-CTS.gtf.GL.cos.cos_float_vert_xvary fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87887">bug 87887</a>
from <span class="vcard"><a class="email" href="mailto:mattst88@gmail.com" title="Matt Turner <mattst88@gmail.com>"> <span class="fn">Matt Turner</span></a>
</span></b>
<pre>(In reply to Kenneth Graunke from <a href="show_bug.cgi?id=87887#c2">comment #2</a>)
<span class="quote">> 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.</span >
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!</pre>
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