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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 --- - Large shaders using UBOs take a long time to compile"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84053">84053</a>
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<th>Assignee</th>
<td>idr@freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>Large shaders using UBOs take a long time to compile
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>minor
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>idr@freedesktop.org
</td>
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<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>git
</td>
</tr>
<tr>
<th>Component</th>
<td>Drivers/DRI/i965
</td>
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<th>Product</th>
<td>Mesa
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=106510" name="attach_106510" title="Sample shader">attachment 106510</a> <a href="attachment.cgi?id=106510&action=edit" title="Sample shader">[details]</a></span>
Sample shader
For example, the attached shader-runner test took 25 minutes on my IVB laptop.
On a debug build of Mesa (with -O1), Sysprof says that ~90% of the time is
spent in brw::vec4_live_variables::compute_live_variables().
Changing the test to do
pass = !(condition) && pass;
instead of
if (condition)
pass = false;
appears to end the slaughter.</pre>
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