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      <base href="https://bugs.freedesktop.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - LLVM unit tests have error in random number handling"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=106232">106232</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>LLVM unit tests have error in random number handling
          </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>src/gallium/drivers/llvmpipe/lp_test_main.c:random_elem() seems to have the
logic reversed in its handling of unsigned values:

   if(!type.sign)
      if(rand() & 1)
         value = -value;

This code only generates negative numbers for *unsigned* values.
write_elem() then has code to fix this up:

   if(!type.sign && value < 0.0)
      value = 0.0;

In practice, the unit tests only cover half the possible range of unsigned
values, and the half of the elements they generate they use are all 0.</pre>
        </div>
      </p>


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