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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvmpipe blends produce bad code after llvm patch https://reviews.llvm.org/D44785"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106231">106231</a>
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<th>Summary</th>
<td>llvmpipe blends produce bad code after llvm patch https://reviews.llvm.org/D44785
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>18.0
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Drivers/Gallium/llvmpipe
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>tom.hudson.phd@gmail.com
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<p>
<div>
<pre><a href="https://reviews.llvm.org/D44785">https://reviews.llvm.org/D44785</a> changed the way adds, addus, subs, subus are
handled.
llvmpipe issues llvm.x86.sse2.padds and llvm.x86.sse2.psubs in
src/gallium/auxiliary/gallivm/lp_bld_arit.c:lp_build_add() and lp_build_sub().
After D44785 landed, lp_test_blend.c started crash every time it entered
LLVM-compiled code for type=u8nx16.
Commenting out the issues of padds/psubs avoids this crash. The LLVM project,
in discussing the bug at <a href="https://reviews.llvm.org/D44785">https://reviews.llvm.org/D44785</a>, suspects that the
cause may be because llvmpipe is "missing the autoupgrade stage"?</pre>
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