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    <head>
      <base href="https://bugs.freedesktop.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <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>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>llvmpipe blends produce bad code after llvm patch https://reviews.llvm.org/D44785
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Mesa
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>18.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Drivers/Gallium/llvmpipe
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>mesa-dev@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>tom.hudson.phd@gmail.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>mesa-dev@lists.freedesktop.org
          </td>
        </tr></table>
      <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>
        </div>
      </p>


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