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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Texture artifacts in Kerbal Space Program"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78648">78648</a>
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<th>Assignee</th>
<td>idr@freedesktop.org
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<th>Summary</th>
<td>Texture artifacts in Kerbal Space Program
</td>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Reporter</th>
<td>lemody@gmail.com
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>git
</td>
</tr>
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<th>Component</th>
<td>Drivers/DRI/i965
</td>
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<th>Product</th>
<td>Mesa
</td>
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<div>
<pre>With Mesa master there are strange flickering 'rectangles' in the terrain
texture when watching the planet from sky in kerbal space program. This is a
regression, used to look fine before.
I've bisected the regression in to following commit:
--- 8< ---
42a26cb5e441a01d5288b299980f23affaad53fe is the first bad commit
commit 42a26cb5e441a01d5288b299980f23affaad53fe
Author: Matt Turner <<a href="mailto:mattst88@gmail.com">mattst88@gmail.com</a>>
Date: Wed Apr 9 13:38:14 2014 -0700
i965: Don't make instructions with a null dest a barrier to scheduling.
Now that we properly track accumulator dependencies, the scheduler is
able to schedule instructions between the mach and mov in the common
the integer multiplication pattern:
mul acc0, x, y
mach null, x, y
mov dest, acc0
Since a null destination implies no dependency on the destination, we
can also safely schedule instructions (that don't write the accumulator)
between the mul and mach.
Reviewed-by: Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>></pre>
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